1
At which two layers of the OSI model does a WAN operate? (Choose two.)
**Physical Layer
**Data Link Layer
Network Layer
Transport Layer
Presentation Layer
Application Layer
2
Which three WAN devices can be found in the cloud? (Choose three.)
**ATM switches
**core routers
CSU/DSU
Ethernet switches
**Frame Relay switches
repeaters
3
Which networking device is typically used to concentrate the dial-in and dial-out traffic of multiple users to and from a network?
core router
**access server
Frame Relay switch
ATM switch
4
Which packet-switched WAN technology offers high-bandwidth connectivity capable of managing data, voice, and video all on the same infrastructure?
Time Division Multiplexing (TDM)
**metro Ethernet
Integrated Services Digital Network (ISDN)
Public Switched Telephone Network (PSTN)
5
Which three features are identified with Frame Relay connections? (Choose three.)
**CIR
**DLCI
DSLAM
**PVC
SPID
53-byte cells
6
Which WAN technology uses a fixed payload of 48 bytes and is transported across both switched and permanent virtual circuits?
**ATM
ISDN
Frame Relay
metro Ethernet
7
What are two advantages of an analog PSTN WAN connection? (Choose two.)
**low cost
**availability
traffic encryption
available bandwidth
support for voice and video
8
What three terms are associated with ISDN PRI? (Choose three.)
DLCI
**circuit switching
packet switching
**data bearer channels
switched virtual circuits
**time-division multiplexing
9
What can cause a reduction in available bandwidth on a cable broadband connection?
smaller cells
**number of subscribers
committed information rate
distance from the central office of the provider
10
What type of connectivity is established when VPNs are used from the remote site to the private network?
PVCs
DLCIs
**tunnels
virtual circuits
dedicated Layer 2 links
11
A U.S. company requires a WAN connection used only to transfer sales data from individual stores to the home office. All transfers will occur after business hours. The required bandwidth for this connection is estimated to be less than 38 kbps. Which type of connection requires the least investment for this company?
ATM
ISDN
**analog dialup
T1 Leased Line
12
For digital lines, which device is used to establish the communications link between the customer equipment and the local loop?
**CSU/DSU
Frame Relay switch
ISDN switch
modem
PBX switch
13
Which term describes a device that will put data on the local loop?
DLCI
DTE
**DCE
BRI
PRI
14
Which switching type will allow the communication devices in the provider network to be shared and only allocated to an individual subscriber during data transfer?
circuit-switched
dedicated switched lines
frame-switched
**packet-switched
15
A company needs a WAN connection that is capable of transferring voice, video, and data at a minimum data rate of 155 Mbps. Which WAN connection is the best choice?
X.25
DSL
**ATM
ISDN BRI
ISDN PRI
16
Which two devices are commonly used as data communications equipment? (Choose two.)
**modem
router
**CSU/DSU
ISDN switch
Ethernet switch
17
Which statement is true of the functionality of the layers in the hierarchical network model?
The purpose of the access layer is to provide very high bandwidth communications between network devices.
Most security screening to prevent unauthorized entry to the network happens at the core layer.
Untrusted external connections are segmented from the rest of the network at all three levels.
The core layer uses high speed equipment to provide policy-based connectivity.
**The distribution layer aggregates WAN connections at the edge of the campus.
18
Which statement is true about data connectivity between a customer and a service provider?
Normally the CSU/DSU is the designated demarcation point for the service provider but not the customer.
**The segment between the demarcation point and the central office is known as the "last mile."
The local loop is the segment between the CSU/DSU and the serial port on a router.
Putting data on the local loop is the responsibility of the DTE.
19
Which statement is true about the differences between a WAN and a LAN?
WANs generally support higher bandwidth than LANs support.
A WAN link typically traverses shorter geographic distances than a LAN link traverses.
**A WAN often relies on the services of carriers, such as telephone or cable companies, but a LAN does not.
All WAN implementations generally use the same Layer 2 protocol but there are many accepted LAN Layer 2 protocols in use.
20
Why is the call setup time of a circuit-switched WAN implementation considered a drawback?
Routing protocols are incompatible with this function.
It restricts the communication sent to voice traffic only.
A telephone must be used to initially start transferring data.
**Data cannot be transferred until a circuit has been established.
21
Which statement about WAN protocols is correct?
ATM differs from other WAN protocols in that it uses variably sized packets.
**Most WAN protocols use HDLC or a variant of HDLC as a framing mechanism.
The frame header consists of the frame check sequence and cyclic redundancy check.
ISDN differs from Frame Relay, HDLC, and ATM in that it is packet-switched rather than circuit-switched technology.
22
What is an advantage of packet-switched technology over circuit-switched technology?
Packet-switched networks are less susceptible to jitter than circuit-switched networks are.
**Packet-switched networks can efficiently use multiple routes inside a service provider network.
Packet-switched networks do not require an expensive permanent connection to each endpoint.
Packet-switched networks usually experience lower latency than circuit-switched networks experience.
1
Which serial communications DTE/DCE interface standard is used to provide high-speed connectivity of up to 52 Mbps between LANs and is found on many high-end Cisco routers?
EIA/TIA 232 (RS-232)
EIA/TIA 422 (RS-422)
EIA/TIA 423 (RS-423)
**EIA/TIA-612/613 (HSSI)
ITU V.35
2
Refer to the exhibit. Which two statements are true regarding the output shown? (Choose two.)
The router has agreed on IP parameters.
The router has negotiated LCP successfully.
**The router is negotiating IP compression options.
The router is requesting an IP address from its peer.
The router has accepted IP but not the suggested IP options.
3
Refer to the exhibit. Which statement is true about PPP operation?
Layer 2 is down.
LCP, IPCP, and CDPCP negotiations are in progress.
Only the link-establishment phase completed successfully.
**Both the link-establishment and network-layer phase completed successfully.
4
Which three statements correctly describe PPP authentication? (Choose three.)
**PAP sends passwords in clear text.
PAP uses a 3-way handshake to establish a link.
PAP provides protection from repeated trial-and-error attacks.
CHAP uses a 2-way handshake to establish a link.
**CHAP uses a challenge/response that is based on the MD5 hash algorithm.
**CHAP uses repeated challenges for verification.
5
What function do Network Control Protocols provide for a PPP connection?
to supply error detection
to establish and terminate data links
to provide authentication capabilities to PPP
to manage network congestion and to allow quality testing of the link
**to allow multiple Layer 3 protocols to operate over the same physical link
6
Which two statements are true about time-division multiplexing (TDM)? (Choose two.)
TDM relies on Layer 3 protocols to operate.
**Multiple sources can transmit over a single channel.
**Original data streams must be reconstructed at the destination.
TDM methods vary depending on the Layer 2 protocol that is used.
It allows information from multiple channels to be allocated bandwidth on multiple wires.
7
Refer to the exhibit. While troubleshooting a serial interface, a technician enters the command show interface serial 0/0/0 . If the interface is in DCE mode, what two problems are likely to cause the indicated problem? (Choose two.)
**The remote CSU or DSU has failed.
The router is not sensing a CD signal.
**A timing problem has occurred on the cable.
The line is not physically connected to the CSU/DSU.
The router configuration contains the shutdown interface configuration command.
8
Which PPP configuration option can be used to establish load balancing over the interfaces of a router?
callback
**multilink
compression
error detection
9
What advantage does PPP have over HDLC for serial communications?
It can communicate more efficiently with other Cisco devices
It is less complex to configure
It has less Layer 2 overhead
**It supports authentication
10
Which authentication protocol can be spoofed to allow playback attacks?
MD5
CHAP
**PAP
NCP
11
Which three statements are true regarding LCP? (Choose three.)
**It is responsible for negotiating link establishment.
It negotiates options for Layer 3 protocols running over PPP.
It uses MD5 encryption while negotiating link establishment parameters.
**It terminates the link upon user request or the expiration of an inactivity timer.
**It can test the link to determine if link quality is sufficient to bring up the link.
It monitors the link for congestion and dynamically adjusts the acceptable window size.
12
Refer to the exhibit. What statement is true regarding the output shown?
NCP has successfully negotiated.
The PAP passwords did not match, so the routers are trying CHAP authentication.
**One router has suggested PAP authentication, and the other has accepted authentication but suggested CHAP authentication.
One router can only use PAP authentication while the other router can only use CHAP, so the connection has been rejected.
13
Why are serial connections preferred over parallel connections for long transmission lengths?
Parallel connections do not support error checking.
Parallel connections are subject to excessive attenuation.
**Parallel connections are subject to clock skew and to crosstalk between wires.
Parallel connections transmit over only two wires and therefore transmit data more slowly.
14
Refer to the exhibit. What can be concluded about the function of the Serial 0/0/0 interface on the router after the commands are entered?
All username and password information that is sent will be encrypted.
All authentication on the serial link will be accomplished using a three-way handshake.
The Predictor algorithm will be used to compress all packets that are sent and received on the serial link.
**The serial link will be closed if the number of received packets at the destination node falls below 90 percent of the packets that are sent.
15
What does the demarcation point represent in data communication physical circuits?
DTE/DCE interface on the device connecting to the Internet
location of the firewall or router
**physical point at which the public network ends and the private customer network begins
tag assigned to the physical block where a cross-connect occurs
16
Refer to the exhibit. Router R1 is not able to communicate with a neighbor router that is directly connected to serial 0/0/0. What is the reason for this?
Interface Serial0/0/0 resets very frequently.
PPP LQM has shutdown the serial interface.
The serial interface has no input or output queues available.
The serial interface is not configured for a Layer 2 protocol.
**The interface has been administratively shutdown with the shutdown command.
17
Refer to the exhibit. On the basis of the show interface Serial0/0 output, how many NCP sessions have been established?
one
**two
three
four
18
Which three statements are correct about HDLC encapsulation? (Choose three.)
HDLC does not support CDP.
HDLC and PPP are compatible.
HDLC supports PAP and CHAP authentication.
**HDLC implementation in Cisco routers is proprietary.
**HDLC is the default serial interface encapsulation on Cisco routers.
**HDLC uses frame delimiters to mark the beginnings and ends of frames.
19
Which two options can LCP negotiate? (Choose two.)
**link quality
**authentication
dynamic flow control
compression and network layer address for IP
connection-oriented or connectionless communication methods
20
Refer to the exhibit. What statement is true regarding the output shown?
LCP is in the process of negotiating a link.
LCP and NCP are waiting for CHAP authentication to complete.
LCP negotiation has been successful, but NCP negotiation is in progress.
**Data is able to flow across this link.
21
Refer to the exhibit. Router R1, the DCE device, has just been configured for PPP encapsulation with authentication. What series of commands will allow another router, the DTE device, to communicate over its serial 0/0/0 interface to router R1?
**Router(config)# hostname R3
R3(config)# username R1 password Cisco
R3(config)# interface Serial 0/0/0
R3(config-if)# encapsulation ppp
R3(config-if)# ip address 172.16.3.3 255.255.255.0
R3(config-if)# ppp authentication chap
Router(config)# hostname R3
R3(config)# username R3 password Cisco
R3(config)# interface Serial 0/0/0
R3(config-if)# encapsulation ppp
R3(config-if)# ip address 172.16.3.3 255.255.255.0
R3(config-if)# ppp authentication chap
Router (config)# username Router password Cisco
Router (config)# interface Serial 0/0/0
Router (config-if)# clockrate 64000
Router (config-if)# encapsulation ppp
Router (config-if)# ip address 172.16.3.1 255.255.255.0
Router config-if)# ppp authentication chap
Router (config)# username R1 password Cisco
Router config)# interface Serial 0/0/0
Router (config-if)# clockrate 64000
Router config-if)# encapsulation ppp
Router (config-if)# ip address 172.16.3.1 255.255.255.0
Router (config-if)# ppp authentication chap
Assessment System
1
Refer to the exhibit. Router R1 has been configured for Frame Relay connectivity to routers R2 and R3. What configuration option should be configured on the R2 and R3 serial interfaces in order for all routers to ping each other successfully?
R2(config-if)# frame-relay interface-dlci 201 broadcast
R3(config-if)# frame-relay interface-dlci 301 broadcast
R2(config-if)# frame-relay map ip 10.1.1.1 201 broadcast
R3(config-if)# frame-relay map ip 10.1.1.1 301 broadcast
R2(config-if)# frame-relay map ip 10.1.1.3 201 broadcast
R3(config-if)# frame-relay map ip 10.1.1.2 301 broadcast
**R2(config-if)# frame-relay map ip 10.1.1.1 201 broadcast
R2(config-if)# frame-relay map ip 10.1.1.3 201 broadcast
R3(config-if)# frame-relay map ip 10.1.1.1 301 broadcast
R3(config-if)# frame-relay map ip 10.1.1.2 301 broadcast
2
Refer to the exhibit. Router R1 has been configured for Frame Relay connectivity to routers R2 and R3. Which set of configuration options for routers R2 and R3 would provide each router connectivity to R1?
R2(config)# interface serial0/0/1
R2(config-if)# frame-relay map ip 10.1.1.1 102
R3(config)# interface serial0/0/1
R3(config-if)# frame-relay map ip 10.1.2.1 103
R2(config)# interface serial0/0/1
R2(config-if)# frame-relay map ip 10.1.1.1 102
R2(config-if)# frame-relay map ip 10.1.2.3 301
R3(config)# interface serial0/0/1
R3(config-if)# frame-relay map ip 10.1.2.1 103
R3(config-if)# frame-relay map ip 10.1.1.2 201
R2(config)# interface serial0/0/1.201 point-to-point
R2(config-if)# no frame-relay invers-arp
R3(config)# interface serial0/0/1.301 point-to-point
R3(config-if)# no frame-relay invers-arp
**R2(config)# interface serial0/0/1.201 point-to-point
R2(config-if)# frame-relay interface-dlci 201
R3(config)# interface serial0/0/1.301 point-to-point
R3(config-if)# frame-relay interface-dlci 301
3
Refer to the exhibit. What can be determined about the Frame Relay switch from the output shown?
It is currently not transmitting data.
It is in the process of establishing the PVC.
It has put a hold on processing frames in excess of the CIR.
**It is experiencing congestion.
4
Refer to the exhibit. What can be determined from the output?
Serial 0/0/0 has been configured with an DLCI of 201.
**Serial 0/0/0 has the feature frame-relay inverse-arp enabled.
Serial 0/0/0 has been configured with an IP address of 172.16.4.3.
Serial 0/0/0 has been configured with the command frame-relay map ip 172.16.4.3 201 broadcast.
5
Refer to the exhibit. Which two statements are true given the output shown? (Choose two.)
The IP address of the local Frame Relay interface is 172.16.1.4.
**The local DLCI number is 401.
**Inverse ARP is being used on this connection.
This interface is in the active state and in the process of negotiating configuration parameters.
Multicast is not enabled on this connection.
6
What best describes the use of a data-link connection identifier (DLCI)?
local address identifying a destination router across a Frame Relay network
**locally significant address used to identify a virtual circuit
logical address identifying the interface between a router and a Frame Relay switch
logical address used to identify the DCE
7
Which two items allow the router to map data link layer addresses to network layer addresses in a Frame Relay network? (Choose two.)
ARP
RARP
Proxy ARP
**Inverse ARP
**LMI status messages
ICMP
8
Refer to the exhibit. When troubleshooting a Frame Relay connection, an administrator entered the show interfaces s0/0 command and received the output shown in the exhibit. What are two probable reasons for this problem? (Choose two.)
The cable between the CSU/DSU and the router is disconnected.
The serial 0/0 interface is shutdown.
**The router is not configured for the same Frame Relay PVC as the switch.
**The LMI type on the Frame Relay switch is NOT ANSI.
The address of the Frame Relay switch is not in the routing table.
9
Refer to the exhibit. What effect does the point-to-point configuration on subinterface S0/0.110 have on the operation of the router?
It helps to conserve IP addresses.
It establishes multiple PVC connections to multiple physical interfaces.
**It eliminates split horizon issues without increasing the likelihood of routing loops.
It requires the configuration of the encapsulation command on the subinterface.
10
What two methods does Frame Relay technology use to process frames that contain errors? (Choose two.)
**Frame Relay services depend on the upper layer protocols to handle error recovery.
It requires the receiving device to request that the sender retransmit erroneous frames.
FECN, BECN, and DE bits are set in the frames to minimize errors.
**The receiving device drops any frames that contain errors without notifying the sender.
The frame relay switch notifies the sender that errors were detected.
11
Which best describes the benefit of using Frame Relay as opposed to a leased line or ISDN service?
Customers can define their virtual circuit needs in far greater combinations, with increments as small as 64 kbps.
Customers pay for an end-to-end connection that includes the local loop and the network link.
**Customers only pay for the local loop and the bandwidth they purchase from the network provider.
Connecting new sites requires new lower cost circuit installations when compared to ISDN dialup costs or adding additional hardware for leased service.
12
Refer to the exhibit. What can be known about the configuration of router R1 from the output?
The Frame Relay LMI DLCI has been incorrectly configured as DLCI 1023.
The Frame Relay LMI type has been changed from its default.
The Serial 0/0/0 interface has been configured as a data communications equipment device.
**The command encapsulation frame-relay ietf has been used on the Serial 0/0/0 interface.
13
Refer to the exhibit. Which two outcomes occur from the configuration shown? (Choose two.)
The broadcasts will be forwarded to 10.1.1.1.
**The router will use DLCI 22 to forward data to 10.1.1.1.
DLCI 22 will replace the MAC address in the ARP table for entry 10.1.1.1
**Frames arriving on interface serial 0/0/0 of RT_1 will have a data link layer address of 22.
Inverse-ARP will now add an entry for 10.1.1.1 into the Frame Relay map table using DLCI 22.
14
Refer to the exhibit. Router R2 is part of a Frame Relay network that uses OSPF for IP routing. After the commands that are shown are entered, R2 will not exchange OSPF information correctly. What is the likely cause?
**The frame-relay map command requires the broadcast keyword.
The DLCIs on each end of the PVCs are not identical.
The R2 S0/0/0 interface has not been brought online.
The LMI or Inverse ARP or both are not working.
15
What is created between two DTEs in a Frame Relay network?
ISDN circuit
limited access circuit
switched parallel circuit
**virtual circuit
16
What consideration must be taken into account if RIP is used on Frame Relay multiaccess networks?
**To forward routing updates, address-to-DLCI mapping must be done via the use of the frame-relay map command coupled with the broadcast keyword.
Inverse ARP must be enabled to turn routing update broadcasts into unicast traffic that can be propagated to other Frame Relay nodes.
Because broadcast traffic is not supported, RIPv1 cannot be implemented on Frame Relay networks.
To forward broadcast routing updates, dynamic mapping must be enabled.
17
Which three actions does a Frame Relay switch perform when it detects an excessive build-up of frames in its queue? (Choose three.)
puts a hold on accepting frames in excess of the CIR
**drops frames from the queue that have the DE bit set
reduces the number of frames it sends over the link
re-negotiates flow control with the connected device
**sets the FECN bit on all frames it receives on the congested link
**sets the BECN bit on all frames it places on the congested link
18
Refer to the exhibit. A ping is sent to address 192.168.50.10 from the Peanut router. Which DLCI will be used to send the ping?
**110
115
220
225
19
Refer to the exhibit. Which statement explains why the Frame Relay connection between R1 and R2 is failing?
Split horizon must be disabled.
The LMI type must be specified.
Logical subinterfaces must be used instead.
**The frame-relay map commands are using incorrect DLCIs.
20
Which statement about Frame Relay subinterfaces is correct?
Multipoint interfaces will automatically forward routing broadcasts but will consume more IP addresses than point-to-point subinterfaces will consume.
**Point-to-point subinterfaces act like leased lines and eliminate split-horizon routing issues.
Interfaces with multiple PVCs require a separate subinterface for each PVC.
Multipoint configurations cannot use subinterfaces.
21
Refer to the exhibit. You are a network administrator who has been tasked with completing the Frame Relay topology that interconnects two remote sites. Router HQ belongs to both the 172.16.1.0/24 and 172.16.2.0/24 subnets with IP addresses of 172.16.1.3 and 172.16.2.3 respectively. Traffic between R1 and R2 must travel through HQ first. How should the serial interface on HQ be configured to complete the topology?
one multipoint subinterface
**two point-to-point subinterfaces
with the physical interface configured with two ip addresses
one IP address on a point-to-point subinterface and one IP address on the physical interface
22
Refer to the exhibit. What can be determined about the configuration of router R1 from the exhibited output?
LMI updates are not being received properly.
**The LMI type for the Serial 0/0/0 interface has been left to its default configuration.
Cisco HDLC is used as a Layer 2 encapsulation protocol on the Serial 0/0/0 interface.
The Serial 0/0/0 interface has been configured as a data communications equipment device.
1
Which two statements are true regarding network security? (Choose two.)
Securing a network against internal threats is a lower priority because company employees represent a low security risk.
**Both experienced hackers who are capable of writing their own exploit code and inexperienced individuals who download exploits from the Internet pose a serious threat to network security.
Assuming a company locates its web server outside the firewall and has adequate backups of the web server, no further security measures are needed to protect the web server because no harm can come from it being hacked.
Established network operating systems like UNIX and network protocols like TCP/IP can be used with their default settings because they have no inherent security weaknesses.
**Protecting network devices from physical damage caused by water or electricity is a necessary part of the security policy.
2
Which two statements are true about network attacks? (Choose two.)
Strong network passwords mitigate most DoS attacks.
Worms require human interaction to spread, viruses do not.
Reconnaissance attacks are always electronic in nature, such as ping sweeps or port scans.
**A brute-force attack searches to try every possible password from a combination of characters.
**Devices in the DMZ should not be fully trusted by internal devices, and communication between the DMZ and internal devices should be authenticated to prevent attacks such as port redirection.
3
Users are unable to access a company server. The system logs show that the server is operating slowly because it is receiving a high level of fake requests for service. Which type of attack is occurring?
reconnaissance
access
**DoS
worm
virus
Trojan horse
4
Refer to the exhibit. Security Device Manager (SDM) is installed on router R1. What is the result of opening a web browser on PC1 and entering the URL https://192.168.10.1?
The password is sent in plain text.
A Telnet session is established with R1.
**The SDM page of R1 appears with a dialog box that requests a username and password.
The R1 home page is displayed and allows the user to download Cisco IOS images and configuration files.
5
Which two conditions should the network administrator verify before attempting to upgrade a Cisco IOS image using a TFTP server? (Choose two.)
Verify the name of the TFTP server using the show hosts command.
Verify that the TFTP server is running using the tftpdnld command.
Verify that the checksum for the image is valid using the show version command.
**Verify connectivity between the router and TFTP server using the ping command.
**Verify that there is enough flash memory for the new Cisco IOS image using the show flash command.
6
What is the best defense for protecting a network from phishing exploits?
Schedule antivirus scans.
Schedule antispyware scans .
**Schedule training for all users.
Schedule operating systems updates.
7
Which two objectives must a security policy accomplish? (Choose two.)
provide a checklist for the installation of secure servers
describe how the firewall must be configured
**document the resources to be protected
**identify the security objectives of the organization
identify the specific tasks involved in hardening a router
8
What are three characteristics of a good security policy? (Choose three.)
**It defines acceptable and unacceptable use of network resources.
**It communicates consensus and defines roles.
It is developed by end users.
It is developed after all security devices have been fully tested.
**It defines how to handle security incidents.
It should be encrypted as it contains backups of all important passwords and keys.
9
Intrusion detection occurs at which stage of the Security Wheel?
securing
**monitoring
testing
improvement
reconnaissance
10
Refer to the exhibit. A network administrator is trying to configure a router to use SDM, but it is not functioning correctly. What could be the problem?
****The privilege level of the user is not configured correctly.
The authentication method is not configured correctly.
The HTTP server is not configured correctly.
The HTTP timeout policy is not configured correctly.
11
What are two benefits of using Cisco AutoSecure? (Choose two.)
It gives the administrator detailed control over which services are enabled or disabled.
****It offers the ability to instantly disable non-essential system processes and services.
It automatically configures the router to work with SDM.
It ensures the greatest compatibility with other devices in your network.
****It allows the administrator to configure security policies without having to understand all of the Cisco IOS software features.
12
The Cisco IOS image naming convention allows identification of different versions and capabilities of the IOS. What information can be gained from the filename c2600-d-mz.121-4? (Choose two.)
The "mz" in the filename represents the special capabilities and features of the IOS.
The file is uncompressed and requires 2.6 MB of RAM to run.
****The software is version 12.1, 4th revision.
The file is downloadable and 121.4MB in size.
****The IOS is for the Cisco 2600 series hardware platform.
13
Refer to the exhibit. The network administrator is trying to back up the Cisco IOS router software and receives the output shown. What are two possible reasons for this output? (Choose two.)
The Cisco IOS file has an invalid checksum.
The TFTP client on the router is corrupt.
****The router cannot connect to the TFTP server.
****The TFTP server software has not been started.
There is not enough room on the TFTP server for the software.
14
Which two statements regarding preventing network attacks are true? (Choose two.)
The default security settings for modern server and PC operating systems can be trusted to have secure default security settings.
Intrusion prevention systems can log suspicious network activity, but there is no way to counter an attack in progress without user intervention.
****Physical security threat mitigation consists of controlling access to device console ports, labeling critical cable runs, installing UPS systems, and providing climate control.
Phishing attacks are best prevented by firewall devices.
****Changing default usernames and passwords and disabling or uninstalling unnecessary services are aspects of device hardening.
15
Which step is required to recover a lost enable password for a router?
****Set the configuration register to bypass the startup configuration.
Copy the running configuration to the startup configuration.
Reload the IOS from a TFTP server from ROMMON.
Reconfigure the router using setup mode.
16
An IT director has begun a campaign to remind users to avoid opening e-mail messages from suspicious sources. Which type of attack is the IT director trying to protect users from?
DoS
DDoS
****virus
access
reconnaissance
17
Which statement is true about Cisco Security Device Manager (SDM)?
SDM can run only on Cisco 7000 series routers.
****SDM can be run from router memory or from a PC.
SDM should be used for complex router configurations.
SDM is supported by every version of the Cisco IOS software.
18
Which two statements define the security risk when DNS services are enabled on the network? (Choose two.)
****By default, name queries are sent to the broadcast address 255.255.255.255.
DNS name queries require the ip directed-broadcast command to be enabled on the Ethernet interfaces of all routers.
Using the global configuration command ip name-server on one router enables the DNS services on all routers in the network.
****The basic DNS protocol does not provide authentication or integrity assurance.
The router configuration does not provide an option to set up main and backup DNS servers.
19
The password recovery process begins in which operating mode and using what type of connection? (Choose two.)
****ROM monitor
boot ROM
Cisco IOS
****direct connection through the console port
network connection through the Ethernet port
network connection through the serial port
20
Refer to the exhibit. Security Device Manager (SDM) has been used to configure a required level of security on the router. What would be accomplished when the SDM applies the next step on the security problems that are identified on the router?
SDM will automatically invoke the AutoSecure command.
SDM will generate a report that will outline the proper configuration actions to alleviate the security issues.
****SDM will create a configuration file that can be copy and pasted into the router to reconfigure the services.
SDM will reconfigure the services that are marked in the exhibit as “fix it” to apply the suggested security changes.
21
Refer to the exhibit. What is the purpose of the "ip ospf message-digest-key 1 md5 cisco" statement in the configuration?
****to specify a key that is used to authenticate routing updates
to save bandwidth by compressing the traffic
to enable SSH encryption of traffic
to create an IPsec tunnel
22
Refer to the exhibit. What is accomplished when both commands are configured on the router?
The commands filter UDP and TCP traffic coming to the router.
The commands disable any TCP or UDP request sent by the routing protocols.
****The commands disable the services such as echo, discard, and chargen on the router to prevent security vulnerabilities.
The commands disable the BOOTP and TFTP server services to prevent security vulnerabilities.
1
Which three parameters can ACLs use to filter traffic? (Choose three.)
packet size
**protocol suite
**source address
**destination address
source router interface
destination router interface
2
Refer to the exhibit. The administrator wishes to block web traffic from 192.168.1.50 from reaching the default port of the web service on 192.168.3.30. To do this, the access control list name is applied inbound on the router R1 LAN interface. After testing the list, the administrator has noted that the web traffic remains successful. Why is web traffic reaching the destination?
Web traffic does not use port 80 by default.
The access list is applied in the wrong direction.
The access list needs to be placed closer to the destination, on R3.
**The range of source addresses specified in line 10 does not include host 192.168.1.50.
3
How do Cisco standard ACLs filter traffic?
by destination UDP port
by protocol type
**by source IP address
by source UDP port
by destination IP address
4
By default, how is IP traffic filtered in a Cisco router?
blocked in and out of all interfaces
blocked on all inbound interfaces, but permitted on all outbound interfaces
**permitted in and out of all interfaces
blocked on all outbound interfaces, but permitted on all inbound interfaces
5
Where should a standard access control list be placed?
close to the source
**close to the destination
on an Ethernet port
on a serial port
6
Which two statements are correct about extended ACLs? (Choose two)
Extended ACLs use a number range from 1-99.
Extended ACLs end with an implicit permit statement.
**Extended ACLs evaluate the source and destination addresses.
**Port numbers can be used to add greater definition to an ACL.
Multiple ACLs can be placed on the same interface as long as they are in the same direction.
7
Refer to the exhibit. How will Router1 treat traffic matching the time-range requirement of EVERYOTHERDAY?
TCP traffic entering fa0/0 from 172.16.1.254/24 destined to the 10.1.1.0/24 network is permitted.
TCP traffic entering fa0/0 from 10.1.1.254/24 destined to the 172.16.1.0/24 network is permitted.
Telnet traffic entering fa0/0 from 172.16.1.254/24 destined to the 10.1.1.0/24 network is permitted.
**Telnet traffic entering fa0/0 from 10.1.1.254/24 destined to the 172.16.1.0/24 network is permitted.
8
Which two statements are true regarding the significance of the access control list wildcard mask 0.0.0.7? (Choose two.)
The first 29 bits of a given IP address will be ignored.
**The last 3 bits of a given IP address will be ignored.
The first 32 bits of a given IP address will be checked.
**The first 29 bits of a given IP address will be checked.
The last 3 bits of a given IP address will be checked.
9
Refer to the exhibit. ACL 120 is configured inbound on the serial0/0/0 interface on router R1, but the hosts on network 172.11.10.0/24 are able to telnet to network 10.10.0.0/16. On the basis of the provided configuration, what should be done to remedy the problem?
**Apply the ACL outbound on the serial0/0/0 interface on router R1.
Apply the ACL outbound on the FastEthernet0/0 interface on router R1.
Include the established keyword at the end of the first line in the ACL.
Include a statement in the ACL to deny the UDP traffic that originates from 172.11.10.0/24 network.
10
Interface s0/0/0 already has an IP ACL applied inbound. What happens when the network administrator attempts to apply a second inbound IP ACL?
**The second ACL is applied to the interface, replacing the first.
Both ACLs are applied to the interface.
The network administrator receives an error.
Only the first ACL remains applied to the interface.
11
Which two statements are true regarding named ACLs? (Choose two.)
Only named ACLs allow comments.
**Names can be used to help identify the function of the ACL.
Named ACLs offer more specific filtering options than numbered ACLs.
**Certain complex ACLs, such as reflexive ACLs, must be defined with named ACLs.
More than one named IP ACL can be configured in each direction on a router interface.
12
Which three items must be configured before a dynamic ACL can become active on a router? (Choose three.)
**extended ACL
reflexive ACL
console logging
**authentication
**Telnet connectivity
user account with a privilege level of 15
13
Refer to the exhibit. How does this access list process a packet with the source address 10.1.1.1 and a destination of 192.168.10.13?
It is allowed because of the implicit deny any.
**It is dropped because it does not match any of the items in the ACL.
It is allowed because line 10 of the ACL allows packets to 192.168.0.0/16.
It is allowed because line 20 of the ACL allows packets to the host 192.168.10.13.
14
A network administrator needs to allow traffic through the firewall router for sessions that originate from within the company network, but the administrator must block traffic for sessions that originate outside the network of the company. What type of ACL is most appropriate?
dynamic
port-based
**reflexive
time-based
15
Which two statements are true regarding the following extended ACL? (Choose two.)
access-list 101 deny tcp 172.16.3.0 0.0.0.255 any eq 20
access-list 101 deny tcp 172.16.3.0 0.0.0.255 any eq 21
access-list 101 permit ip any any
**FTP traffic originating from network 172.16.3.0/24 is denied.
All traffic is implicitly denied.
FTP traffic destined for the 172.16.3.0/24 network is denied.
Telnet traffic originating on network 172.16.3.0/24 is denied.
**Web traffic originating from 172.16.3.0 is permitted.
16
Which feature will require the use of a named ACL rather than a numbered ACL?
**the ability to filter traffic based on a specific protocol
the ability to filter traffic based on an entire protocol suite and destination
the ability to specify source and destination addresses to use when identifying traffic
the ability to edit the ACL and add additional statements in the middle of the list without removing and re-creating the list
17
Which benefit does an extended ACL offer over a standard ACL?
Extended ACLs can be named, but standard ACLs cannot.
Unlike standard ACLs, extended ACLS can be applied in the inbound or outbound direction.
Based on payload content, an extended ACL can filter packets, such as information in an e-mail or instant message.
**In addition to the source address, an extended ACL can also filter on destination address, destination port, and source port.
18
Refer to the exhibit. Which statement is true about ACL 110 if ACL 110 is applied in the inbound direction on S0/0/0 of R1?
It will deny TCP traffic to the Internet if the traffic is sourced from the 172.22.10.0/24 network.
It will not allow TCP traffic coming from the Internet to enter the network 172.22.10.0/24.
It will allow any TCP traffic from the Internet to enter the network 172.22.10.0/24.
**It will permit any TCP traffic that originated from network 172.22.10.0/24 to return inbound on the S0/0/0 interface.
19
Refer to the exhibit. What will be the effect of the configuration that is shown?
**Users attempting to access hosts in the 192.168.30.0/24 network will be required to telnet to R3.
Hosts connecting to resources in the 191.68.30.0/24 network have an idle timeout of 15 minutes.
Anyone attempting to telnet into R3 will have an absolute time limit of five minutes.
Telnet access to R3 will only be permitted on Serial 0/0/1.
20
Which three statements describe ACL processing of packets? (Choose three.)
**An implicit deny any rejects any packet that does not match any ACL statement.
**A packet can either be rejected or forwarded as directed by the statement that is matched.
A packet that has been denied by one statement can be permitted by a subsequent statement.
A packet that does not match the conditions of any ACL statements will be forwarded by default.
**Each statement is checked only until a match is detected or until the end of the ACL statement list.
Each packet is compared to the conditions of every statement in the ACL before a forwarding decision is made.
21
A technician is creating an ACL and needs a way to indicate only the subnet 172.16.16.0/21. Which combination of network address and wildcard mask will accomplish the desired task?
172.16.0.0 0.0.255.255
127.16.16.0 0.0.0.255
**172.16.16.0 0.0.7.255
172.16.16.0 0.0.15.255
172.16.16.0 0.0.255.255
22
Refer to the exhibit. When creating an extended ACL to deny traffic from the 192.168.30.0 network destined for the Web server 209.165.201.30, where is the best location for applying the ACL?
ISP Fa0/0 outbound
R2 S0/0/1 inbound
**R3 Fa0/0 inbound
R3 S0/0/1 outbound
23
Which two statements accurately describe the characteristics of wildcard masks in an ACL? (Choose two.)
Wildcard masks are the inverse of the subnet mask.
The word "any" indicates that all corresponding bits must be matched.
**The word "host" corresponds to a wildcard mask of 0.0.0.0 in an ACL statement.
**A wildcard mask of 0.0.255.255 can be used to create a match for an entire Class B network.
A wildcard mask bit of 1 indicates that the corresponding bit in the address must be matched.
24
Which statement about standard ACLs is true?
Standard ACLS must be numbered and cannot be named.
**They should be placed as close to the destination as possible.
They can filter based on source and destination address as well as on source and destination port.
When applied to an outbound interface, incoming packets are processed before they are routed to the outbound interface.
25
The following commands were entered on a router:
Router(config)# access-list 2 deny 172.16.5.24
Router(config)# access-list 2 permit any
The ACL is correctly applied to an interface. What can be concluded about this set of commands?
**The wildcard mask 0.0.0.0 is assumed.
The access list statements are misconfigured.
All nodes on the 172.16.0.0 network will be denied access to other networks.
No traffic will be allowed to access any nodes or services on the 172.16.0.0 network.
26
Refer to the exhibit. The network administrator applied an ACL outbound on S0/0/0 on router R1. Immediately after the administrator did so, the users on network 172.22.30.0/24 started complaining that they have intermittent access to the resources available on the server on the 10.10.0.0/16 network. On the basis of the configuration that is provided, what is the possible reason for the problem?
The ACL allows only the mail traffic to the server; the rest of the traffic is blocked.
**The ACL permits the IP packets for users on network 172.22.30.0/24 only during a specific time range.
The ACL permits TCP packets only if a connection is established from the server to the network 172.22.0.0/16.
The ACL allows only TCP traffic from users on network 172.22.40.0/24 to access the server; TCP traffic from any other sources is blocked.
1
Refer to the exhibit. All users have a legitimate purpose and the necessary persissions to access the Corporate network. Based on the topology shown, which locations are able to establish VPN connectivity with the Corporate network?
Locations C, D, and E can support VPN connectivity. Locations A and B require an additional PIX Firewall appliance installed on the edge of the network.
Locations C and E can support VPN connectivity. Locations A, B, and D require an additional PIX Firewall appliance installed on the edge of the network.
Locations A, B, D, and E can support VPN connectivity. Location C requires an additional router on the edge of the network.
***All locations can support VPN connectivity.
2
Which statement describes cable?
*****Delivering services over a cable network requires downstream frequencies in the 50 to 860 MHz range, and upstream frequencies in the 5 to 42 MHz range.
The cable subscriber must purchase a cable modem termination system (CMTS)
Each cable subscriber has dedicated upstream and downstream bandwidth.
Cable subscribers may expect up to 27 Mbps of bandwidth on the upload path.
3
Refer to the exhibit. A teleworker is connected over the Internet to the HQ Office. What type of secure connection can be established between the teleworker and the HQ Office?
a GRE tunnel
a site-to-site VPN
******a remote-access VPN
the user must be at the office location to establish a secure connection
4
Which two features can be associated with the Worldwide Interoperability for Microwave Access (WiMAX) telecommunication technology? (Choose two.)
supports municipal wireless networks utilizing mesh technologies
****covers areas as large as 7,500 square kilometers
supports point-to-point links, but not full mobile cellular-type access
****connects directly to the Internet through high-bandwidth connections
operates at lower speeds than Wi-Fi, but supports many more users
5
Which two methods could an administrator use to authenticate users on a remote access VPN? (Choose two.)
*****digital certificates
ESP
hashing algorithms
****smart cards
WPA
6
After conducting research to learn about common remote connection options for teleworkers, a network administrator has decided to implement remote access over broadband to establish VPN connections over the public Internet. What is the result of this solution?
A reliable connection is established at greater speeds than what is offered from dialup over POTS. Security is increased, but username and password information are sent in plain text.
****The connection has increased security and reliable connectivity. Users need a remote VPN router or VPN client software.
Security and reliability are increased at a substantial loss in throughput, which is considered acceptable when supporting a single user environment.
Reliability and security are increased without the need for additional equipment, when compared to dialup connections using POTS.
7
Refer to the exhibit. A VPN tunnel has been established between the HQ Office and the Branch Office over the public Internet. Which three mechanisms are required by the devices on each end of the VPN tunnel to protect the data from being intercepted and modified? (Choose three.)
The devices must use a dedicated Layer 2 connection.
The devices must have the VPN client software installed.
****The two parties must inspect the traffic against the same ACLs.
The two parties must establish a secret key used by encryption and hash algorithms.
****The two parties must agree on the encryption algorithm to be used over the VPN tunnel.
****The devices must be authenticated before the communication path is considered secure.
8
While monitoring traffic on a cable network, a technician notes that data is being transmitted at 38 MHz. Which statement describes the situation observed by the technician?
****Data is being transmitted from the subscriber to the headend.
Data is flowing downstream.
Cable television transmissions are interfering with voice and data transmissions.
The system is experiencing congestion in the lower frequency ranges.
9
A company is using WiMAX to provide access for teleworkers. What home equipment must the company provide at the teleworker's site?
a WiMAX tower
a one-way multicast satellite
****a WiMAX receiver
an access point connected to the company WLAN
10
Which two protocols can be used to encapsulate traffic that is traversing a VPN tunnel? (Choose two.)
ATM
CHAP
****IPsec
IPX
****MPLS
PPTP
11
Data confidentiality through a VPN can be enhanced through the use of which three encryption protocols? (Choose three.)
****AES
****DES
AH
hash
MPLS
****RSA
12
Which two Layer 1 requirements are outlined in the Data-over-Cable Service Interface Specification (DOCSIS)? (Choose two.)
****channel widths
access method
maximum data rate
****modulation techniques
compression techniques
13
Which two statements about DSL are true? (Choose two.)
users are on a shared medium
uses RF signal transmission
****local loop can be up to 3.5 miles (5.5km)
physical and data link layers are defined by DOCSIS
****user connections are aggregated at a DSLAM located at the CO
14
Which two statements are valid solutions for a cable ISP to reduce congestion for users? (Choose two.)
use higher RF frequencies
allocate an additional channel
subdivide the network to reduce users on each segment
reduce the length of the local loop to 5.5 kilometers or less
use filters and splitters at the customer site to separate voice from data traffic
15
A technician has been asked to configure a broadband connection for a teleworker. The technician has been instructed that all uploads and downloads for the connection must use existing phone lines. Which broadband technology should be used?
cable
****DSL
ISDN
POTS
16
Which is an example of symmetric-key encryption?
Diffie-Hellman
digital certificate
****pre-shared key
RSA signature
17
What two protocols provide data authentication and integrity for IPsec? (Choose two.)
****AH
L2TP
****ESP
GRE
PPTP
18
Data confidentiality through a VPN is achieved through which two methods? (Choose two.)
digital certificates
****encryption
****encapsulation
hashing
passwords
19
What are the three main functions of a secure VPN? (Choose three.)
accounting
****authentication
****authorization
data availability
****data confidentiality
data integrity
Assessment System
1
Refer to the exhibit. Which two statements about the configuration are true? (Choose two.)
****Traffic from the 10.1.1.0 network will be translated.
Traffic from the 209.165.200.0 network will be translated.
****Permitted traffic gets translated to a single inside global IP address.
A pool of inside global IP addresses from the 10.1.1.0 network will be used for translation.
External users from the 209.165.200.0 network can reach private addresses on the 10.1.1.0 and 10.1.2.0 networks.
2
Refer to the exhibit. IPv6 address 2006:1::1/64 eui-64 has been configured on the router FastEthernet0/0 interface. Which statement accurately describes the EUI-64 identifier configuration?
It will randomly generate a 64 bit interface ID.
It will assign an address from the pool of IPv6 private addresses to the interface.
****It will assign only the registry prefix of the IPv6 Global Unicast address to the interface.
The configuration will derive the interface portion of the IPv6 address from the MAC address of the interface.
3
Refer to the exhibit. Which address or addresses represent the inside global address?
10.1.1.2
192.168.0.100
****209.165.20.25
any address in the 10.1.1.0 network
4
Refer to the exhibit. A technician used SDM to enter the NAT configuration for a Cisco router. Which statement correctly describes the result of the configuration?
A user on the inside sees web traffic coming from 192.168.1.3 using port 8080.
The address 172.16.1.1 is translated into an address from the pool beginning with 192.168.1.3.
****A user on the outside network sees a request addressed from 192.168.1.3 using port 80.
A user on the outside must address traffic to port 8080 to reach the address 172.16.1.1.
5
How many bits of an IPv6 address are used to identify the interface ID?
32
48
64
****128
6
Refer to the exhibit. What is the purpose of the command marked with an arrow shown in the partial configuration output of a Cisco broadband router?
****defines which addresses can be translated
defines which addresses are allowed into the router
defines which addresses are assigned to a NAT pool
defines which addresses are allowed out of the router
7
What is true regarding the differences between NAT and PAT?
PAT uses the word "overload" at the end of the access-list statement to share a single registered address.
Static NAT allows an unregistered address to map to multiple registered addresses.
Dynamic NAT allows hosts to receive the same global address each time external access is required.
****PAT uses unique source port numbers to distinguish between translations.
8
Refer to the exhibit. On the basis of the configuration shown, how should the pool of the excluded addresses be assigned to key hosts on the network, such as router interfaces, printers, and servers?
The addresses are statically assigned by the network administrator.
****The DHCP server dynamically assigns the addresses.
The addresses must be listed under the DHCP pool of addresses before they are available for static assignment.
The addresses must be listed under the DHCP pool of addresses before they are available for dynamic assignment.
9
After activating IPv6 routing on a Cisco router and programming IPv6 addresses on multiple interfaces, what is the remaining step to activate RIPng?
Enter the interface programming mode for each IPv6 interface and enable IPng RIP.
Enter the ipv6 router rip name command and then use network statements to activate RIPng on the interfaces.
Enter the router rip command, and then activate RIPng using the version command. RIPng then automatically runs on all IPv6 interfaces.
****Enter the interface programming mode for each IPv6 interface and enable the multicast group FF02::9, and then activate RIPng globally using the ipv6 router rip name command.
10
Refer to the exhibit. R1 is performing NAT for the 10.1.1.0/24 network, and R2 is performing NAT for the 192.168.1.2/24 network. What would be valid destination IP address for HostA to put in its IP header when communicating with the web server?
10.1.1.1
****172.30.20.2
192.168.1.2
255.255.255.255
11
What are two benefits of NAT? (Choose two.)
****It saves public IP addresses.
****It adds a degree of privacy and security to a network.
It increases routing performance.
It makes troubleshooting routing issues easier.
It makes tunneling with IPsec less complicated.
12
Refer to the exhibit. How many IPv6 broadcast domains exist in this topology?
****0
1
2
3
4
13
Refer to the exhibit. Traffic exiting R1 is failing translation. What part of the configuration is most likely incorrect?
ip nat pool statement
access-list statement
ip nat inside is on the wrong interface
interface s0/0/2 should be a private IP address
14
Refer to the exhibit. According to the output, how many addresses have been successfully assigned by this DHCP server?
1
6
7
****8
9
15
Refer to the exhibit. Which two addresses could be assigned to traffic leaving S0 as a result of the statement ip nat pool Tampa 179.9.8.96 179.9.8.111 netmask 255.255.255.240? (Choose two.)
10.0.0.125
179.9.8.95
****179.9.8.98
****179.9.8.101
179.9.8.112
16
A technician has been told by a supervisor to always clear any dynamic translations before attempting to troubleshoot a failed NAT connection. Why has the supervisor issued these instructions?
The supervisor wants to clear any confidential information that may be seen by the technician.
****Because entries can be cached for long periods of time, the supervisor wants to prevent decisions being made based on old data.
The translation table may be full and is unable to make new translations until space is available.
Clearing the translations causes the starting configuration to be reread and may correct translation problems that have occurred.
17
Your organization is issued the IPv6 prefix of 2001:0000:130F::/48 by your service provider. With this prefix, how many bits are available for your organization to create subnetworks?
8
16
80
****128
18
What type of NAT should a network administrator use to ensure that a web server on the inside network is always available to the outside network?
NAT overload
****static NAT
dynamic NAT
PAT
19
Refer to the exhibit. A network technician determines DHCP clients are not working properly. The clients are receiving IP configuration information from a DHCP server configured on the router but cannot access the Internet. From the output in the graphic, what is the most likely problem?
The DHCP server service is not enabled.
The inside interface for DCHP is not defined.
The DHCP pool is not bound to the interface.
****The pool does not have a default router defined for the clients.
All the host addresses have been excluded from the DHCP pool.
20
A network administrator wants to connect two IPv6 islands. The easiest way is through a public network that uses only IPv4 equipment. What simple solution solves the problem?
Replace the devices on the public network with devices that support IPv6.
Configure RIPng on the border routers of each IPv6 island.
****Configure the routers to take advantage of dual-stack technology.
Use tunneling to encapsulate the IPv6 traffic in the IPv4 protocol.
21
Refer to the exhibit. The FTP server has an RFC 1918 private address. Users on the Internet need to connect to the FTP server on the Fa0/0 LAN of R1. Which three configurations must be completed on R1? (Choose three.)
dynamic NAT
NAT with overloading
****open port 20
****open port 21
open port 23
****NAT with port forwarding
Assessment System
1
Refer to the exhibit. Users at Branch B are reporting trouble accessing a corporate website running on a server that is located at HQ. HQ and Branch A users can access the website. R3 is able to ping 10.10.10.1 successfully but not 10.10.10.2. The users at Branch B can access servers at Branch A. Which two statements are true aboutthe troubleshooting efforts? (Choose two.)
The web server should be tested for an application layer problem.
****Frame Relay at R3 and R2 should be tested to narrow the scope of the problem.
****The fact that users at Branch A are working normally proves that there is no problem at R2.
An ACL entry error could cause the failure at Layer 4 in either R3 or R2.
The successful ping from R3 to R1 proves that the WAN is functioning normally. Therefore, the problem has to be in the upper layers.
2
A technician has been asked to make several changes to the configuration and topology of a network and then determine the outcome of the changes. What tool can be used to determine the overall effect caused by the changes?
****baselining tool
knowledge base
protocol analyzer
cable tester
3
Which two components should be taken into consideration when establishing a network baseline? (Choose two.)
information about the network design
IP addressing allocation on the network
requirements about the service provider setup
****requirements for access control lists to regulate traffic
****expected performance under normal operating conditions
4
What is one example of a physical layer problem?
incorrect encapsulation
incorrect STP configuration
incorrect ARP mapping
****incorrect clock rate
5
Refer to the exhibit. Users on the Internal LAN are unable to connect to the www server. The network administrator pings the server and verifies that NAT is functioning correctly. Which OSI layer should the administrator begin to troubleshoot next?
physical
data link
network
****application
6
Refer to the exhibit. Which three pieces of information can be determined by analyzing the output shown? (Choose three.)
****A carrier detect signal is present.
****Keepalives are being received successfully.
Default encapsulation is used on this serial link.
Packets passing this interface cannot exceed 1 KB in size.
The reliability of this link is very low.
****The LCP negotiation phase is complete.
7
Refer to the exhibit. Which two steps should be taken during the process of creating network documentation? (Choose two.)
Record the information about the devices discovered in the Campus network only.
****Record the information about the devices discovered in the entire network, including the remote locations.
****Transfer any information about the devices from the network configuration table that corresponds to a component of the topology diagram.
Transfer only the Layer 2 and Layer 3 information about the devices from the network configuration table that corresponds to a component of the topology diagram.
Transfer the recorded information about the devices from the network configuration table gathered during peak network utilization that corresponds to a component of the topology diagram.
8
Information about which OSI layers of connected Cisco devices can be verified with the show cdp neighbors command?
All layers
Layer 1, Layer 2, and Layer 3
****Layer 1, Layer 2, Layer 3, and Layer 4
Layer 6 and Layer 7
9
Which three approaches should be used when attempting to gather data from users for troubleshooting? (Choose three.)
****Determine fault.
Get to know the user to build trust.
****Obtain information by asking simple pertinent questions.
Impress the user with use of technical language and skills.
****Determine if the problem is related to time or a specific event.
Determine if the user can re-create the problem or events leading to the problem.
10
A technician has been asked to troubleshoot an existing switched network but is unable to locate documentation for the VLAN configuration. Which troubleshooting tool allows the technician to map and discover VLAN and port assignments?
cable analyzer
****network analyzer
protocol analyzer
knowledge base
11
Encapsulation errors from mismatched WAN protocols on a serial link between two routers indicate a problem at which OSI layer?
physical
****data link
network
transport
12
What combination of IP address and wildcard mask should be used to specify only the last 8 addresses in the subnet 192.168.3.32/28?
192.168.3.32 0.0.0.7
192.168.3.32 0.0.0.15
****192.168.3.40 0.0.0.7
192.168.3.40 0.0.0.15
13
Users are complaining of very long wait times to access resources on the network. The show interface command reveals collision counts far above the network baseline. At which OSI layer should the administrator begin troubleshooting?
application
transport
network
****data link
physical
14
Which two pieces of information are typically found on a logical network diagram? (Choose two.)
cable types
****connector types
****interface identifiers
DLCI for virtual circuits
operating system versions
15
Which two statements are true concerning logical networking models? (Choose two.)
TCP/IP splits the lowest layer of the OSI model into two separate layers.
****The top layer of the TCP/IP model combines the functions of the top three OSI layers.
Troubleshooting with the TCP/IP model requires different techniques than with the OSI model.
****The network access layer is responsible for exchanging packets between devices on a TCP/IP network.
The Internet layer provides communication between applications, such as FTP, HTTP, and SMTP on separate hosts.
The TCP/IP network access layer corresponds to the OSI physical and data link layers.
16
Clients across the company are reporting poor performance across all corporate applications running in the data center. Internet access and applications running across the corporate WAN are performing normally. The network administrator observes a continual broadcast of random meaningless traffic (jabber) on the application server LAN in the data center on a protocol analyzer. How should the administrator start troubleshooting?
****The jabber in the data center indicates a local physical layer problem. Use the protocol analyzer to determine the source of the jabber, and then check for a recent NIC driver update or bad cabling.
Because all clients are experiencing application problems, the administrator should use a top-down approach with the application servers in the data center.
The scope of the problem indicates a likely routing or spanning-tree problem. Begin by checking routing tables, and follow up using appropriate STP show commands to find a loop if routing is working normally.
Poll the staff to determine if any recent changes have been made. Back out all the changes one by one until the error condition is fixed.
17
A network administrator has received complaints that users on a local LAN can retrieve e-mail from a remote e-mail server but are unable to open web pages on the same server. Services at which two layers of the OSI model should be investigated during the troubleshooting process? (Choose two.)
physical layer
data link layer
network layer
****transport layer
****application layer
18
When gathering symptoms for troubleshooting a network problem, which step could result in getting an external administrator involved in the process?
narrowing the scope
gathering symptoms from suspect devices
analyzing existing symptoms
****determining ownership
19
Which troubleshooting approach is suggested for dealing with a complex problem that is suspected of being caused by faulty network cabling?
****bottom up
top down
divide and conquer
middle out
20
Excessive broadcasts are generally a symptom of a problem at which layer?
physical
****data link
network
transport
