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Take Assessment - EWAN Final Exam - CCNA Exploration: Accessing the WAN (Version 4.0)


1
An administrator has configured a dual-stack router, employing IPv6 and IPv4 on all interfaces and RIPng for routing. All IPv6 traffic reaches its destination as desired, but only directly connected IPv4 networks can be reached. What is the cause of this problem?

All interfaces have been configured with the incorrect IPv4 addresses.

When IPv4 and IPv6 are configured on the same interface, all IPv4 addresses are shut down in favor of the newer technology.

RIPng is incompatible with dual-stack technology.

-----RIP needs to be configured in addition to RIPng to successfully use IPv4.



2


Refer to the exhibit. R1 is performing NAT Overload for the 10.1.1.0/24 inside network. Host A and Host B are both trying to communicate with the web server using a source port of 1234. If the packet from Host A arrives at R1 first, what happens to the packet from Host B?

It is dropped.

It is queued until the session of Host A is completed and the port becomes available.

It is translated, keeping the source port number 1234.

-----It is assigned the first available port number in its range.



3
What are the symptoms when the s0/0/0 interface on a router is attached to an operational CSU/DSU that is generating a clock signal, but the far end router on the point-to-point link has not been activated?

show interfaces s0/0/0 indicates serial down, line protocol down. show controllers indicates cable type “unknown”.

show controllers indicates cable type DCE V.35. show interfaces s0/0/0 indicates serial up, line protocol down.

show controllers indicatse cable type DTE V.35. show interfaces s0/0/0 indicates serial up, line protocol down.

-------show controllers indicates cable type DTE V.35. show interfaces s0/0/0 indicates serial down, line protocol down.



4
A router in a Frame Relay network needs to forward a message received from a host. What two methods does the router use to identify the correct VC to forward the message? (Choose two.)

The router forwards the frame to all ports in the network and learns the address from the reply frame.

The destination host IP address is embedded in the DLCI.

----The router searches Inverse ARP tables for maps of DLCIs to IP addresses.

----A table of static mappings can be searched.

The router broadcasts a request for the required IP address.



5


Refer to the exhibit. To solve split horizon routing issues, the Frame Relay network has been redesigned to include subinterfaces. The appropriate frame-relay map commands have been configured on each router. Site to site pings are not successful. What will fix the problem?

----The subinterfaces must be given addresses in separate subnets.

The no ip split-horizon command must be issued on S0/0/0 on R2.

The DLCI numbers on each end of the PVCs must match.

The addressing has to be changed to publicly routable addresses.




6


Refer to the exhibit. Which two statements are true regarding the configuration shown? (Choose two.)

----Before Layer 3 protocols are negotiated, the routers test the quality of the link.

After the quality of the link is tested, LCP negotiates the compression and authentication options.

----Before Layer 3 protocols are negotiated, the routers authenticate using a three-way handshake.

After LCP negotiations are complete, the IP connection shows as OPEN.

When data exchange is complete, NCP terminates the link.



7


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 username and password are not configured correctly.

The authentication method is not configured correctly.

The HTTP timeout policy is not configured correctly.

----The vtys are not configured correctly.



8


Refer to the exhibit. This serial interface is not functioning correctly. Based on the output shown, what is the most likely cause?

interface reset

improper queuing strategy

unplugged cable

---PPP negotiation failure



9
What two events can occur when a Frame Relay switch detects its queue filling faster than it can process data? (Choose two.)

Frames in excess of the CIR are not accepted by the switch.

----Frames with the DE bit set are dropped from the switch queue.

Frames with the FECN and BECN bits set are dropped from the switch queue.

----The switch sets the FECN bit on all frames it receives on the congested link and sets the BECN bit on all frames it places on the congested link.

The switch sets the FECN bit on all frames it places on the congested link and sets the BECN bit on all frames it receives on the congested link.



10


Refer to the exhibit. Which statement correctly describes how Router1 processes an FTP request entering interface s0/0/0, destined for an FTP server at IP address 192.168.1.5?

It matches the incoming packet to the access-list 101 permit ip any 192.168.1.0 0.0.0.255 statement, continues comparing the packet to the remaining statements in ACL 101 to ensure that no subsequent statements prohibit FTP, and then allows the packet in interface s0/0/0.

It matches the incoming packet to the access-list 201 permit any any statement and allows the packet in interface s0/0/0.

----It matches the incoming packet to the access-list 101 permit ip any 192.168.1.0 0.0.0.255 statement, ignores the remaining statements in ACL 101, and allows the packet in interface s0/0/0.

It reaches the end of ACL 101 without matching a condition and drops the packet because there is no access-list 101 permit any any statement.



11


Refer to the exhibit. What VPN feature is being represented?

digital certificates

encapsulation

encryption

----hashing

tunneling



12


Refer to the exhibit. A new HR server has just been physically installed and configured in the data center by a vendor. The vendor certified that the server has passed all internal quality checks. The application console of the server indicates that the application has loaded and is functioning normally. However, in the initial client testing, the HR department workers report that the application is completely non-functional. The server is also unable to get to the Internet to perform updates. Which troubleshooting efforts are appropriate for these symptoms?

The lack of Internet connectivity indicates a likely problem in the lower layers. Begin with physical connectivity on the server and proceed with a bottom-up methodology.

----Narrow the scope of the investigation by ensuring that no other general connectivity problems exist between the affected clients and other company resources. Use a divide-and-conquer approach by checking the functionality of the intervening switches, beginning with the physical layer.

Because an external vendor installed the server increases the odds of an installation error. Use a top-down methodology by having the vendor reinstall and check each application, and then follow the layers down through the physical layer.

Isolate the problem area by obtaining and installing a protocol analyzer on the server. Coordinate with the test users to capture application traffic. Have the vendor analyze the captured traffic to determine the problem.



13


Refer to the exhibit. The SSH connections between the remote user and the server are failing. The correct configuration of NAT has been verified. What is the most likely cause of the problem?

SSH is unable to pass through NAT.

----There are incorrect access control list entries.

The access list has the incorrect port number for SSH.

The ip helper command is required on S0/0/0 to allow inbound connections.



14
A system administrator must provide Internet connectivity for ten hosts in a small remote office. The ISP has assigned two public IP addresses to this remote office. How can the system administrator configure the router to provide Internet access to all ten users at the same time?

Configure static NAT for all ten users.

Configure dynamic NAT for ten users.

---Configure dynamic NAT with PAT.

Configure DHCP and static NAT.

What the administrator wants to do cannot be done.



15
When configuring a Frame Relay connection, what are two instances when a static Frame Relay map should be used? (Choose two.)

when the remote router is a non-Cisco router

---when the remote router does not support Inverse ARP

when the local router is using IOS Release 11.1 or earlier

----when broadcast traffic and multicast traffic over the PVC must be controlled

when globally significant rather than locally significant DLCIs are being used



16


Refer to the exhibit. What is placed in the address field of a frame that will travel from the DC office of ABC company to the Orlando office?

MAC address of the Orlando router

MAC address of the DC router

----192.168.1.25

192.168.1.26

DLCI 100

--DLCI 200



17
Which three functions are provided by the Local Management Interface used in Frame Relay networks? (Choose three.)

exchange information about the status of virtual circuits

--map DLCIs to network addresses

---provide flow control

provide error notification

provide congestion notification

---send keepalive packets to verify operation of the PVC



18


Refer to the exhibit. While troubleshooting a failed NAT connection, an administrator notices an asterisk (*) on several lines in the debug output. What does this indicate?

The asterisk indicates congestion in the path that may result in dropped packets.

----The asterisk indicates that the translation is proceeding in the fast-switched path, and the administrator should look for other potential causes for the problem.

The asterisk indicates that the traffic is being forced to use a default route.

The asterisk indicates connections that fail to open and requires further investigation of the NAT configuration.



19


Refer to the exhibit. Branch A has a Cisco router. Branch B has a non-Cisco router set for IETF encapsulation. After the commands shown are entered, R2 and R3 fail to establish the PVC. The R2 LMI is Cisco, and the R3 LMI is ANSI. The LMI is successfully established at both locations. What is the likely problem?

LMI types must match on each end of a PVC.

The PVCs at R2 use different encapsulation types. A single port can only support one encapsulation type.

Multipoint topologies are Cisco proprietary. The PVC to R3 must be point to point.

---The ietf parameter is missing from the frame-relay map ip 10.10.10.3 203 command.



20


Refer to the exhibit. Which two statements are true regarding the configuration shown? (Choose two.)

LCP sends a Configure-Reject frame.

---LCP tests the quality of the link.

The routers authenticate using plain text passwords.

NCP terminates the link when data exchange is complete.

----LCP uses link management frames to manage and debug a link.

Layer 3 protocol options are negotiated immediately after the Configuration-Acknowledgement frame is sent.



21
What are three features of the CHAP protocol? (Choose three.)

---exchanges a random challenge number during the session to verify identity

---sends authentication password to verify identity

----prevents transmission of login information in plain text

disconnects the PPP session if authentication fails

initiates a two-way handshake

is vulnerable to playback attacks



22


Refer to the exhibit. A system administrator is unable to ping the S0 interface of the West router from the East router. During the troubleshooting process, the following facts are established:

- IP addressing and subnet masks are correct.
- East is a Cisco router and West is a router from another vendor.

What should the administrator do to solve the problem?

Enable the serial interface on West.

---Change the encapsulation on both routers to PPP.

Add a clock rate on East.

Replace the serial cable used to attach the CSU/DSU to West.

Set the loopback interface on East.



23
The command show frame-relay map gives the following output:

Serial 0 (up): ip 192.168.151.4 dlci 122, dynamic, broadcast, status defined, active

Which three statements represent what is shown?(Choose three.)

---192.168.151.4 represents the IP address of the remote router

192.168.151.4 represents the IP address of the local serial interface

DLCI 122 represents the interface of the remote serial interface

---DLCI 122 represents the local number used to connect to the remote address

---broadcast indicates that a dynamic routing protocol such as RIP v1 can send packets across this PVC

active indicates that the ARP process is working



24
What type of access control list must be used to create a reflexive ACL?

any extended IP ACL

---named extended IP ACL

numbered extended IP ACL

any standard or extended IP ACL



25


Refer to the exhibit. The network administrator creates a standard access control list to prohibit traffic from the 192.168.1.0/24 network from reaching the 192.168.2.0/24 network while still permitting Internet access for all networks. On which router interface and in which direction should it be applied?

interface fa0/0/0, inbound

interface fa0/0/0, outbound

interface fa0/0/1, inbound

---interface fa0/0/1, outbound



26
An established company has recently transitioned from outsourced LAN support to a completely in-house staff. The outsourcing company is no longer in business, so no records are available. There are many user complaints about application speed and availability. What two considerations apply to this situation?

A network utilization baseline should quickly reveal application availability.

A period of 24 to 48 hours should provide a sufficient baseline to track normal network activity.

It is easier to start with monitoring all available data inputs on application servers, and then fine-tune to fewer variables along the way.

The initial baseline results have little relevance to current values after the network has been modified or grown in usage.

---When it is practical, network administrators should attempt to automate the collection of performance data and stay away from manual collection.

---Creating a network baseline data helps determine device thresholds for alerting.



27


Refer to the exhibit. What type of VPN access is established from each location?

Locations A and B – Site-to-site VPN
Locations C, D, and E - Remote access VPN

--Locations A, B, and C – Site-to-site VPN
Locations D and E - Remote access VPN

Locations A, B, C, and D – Site-to-site VPN
Location E - Remote access VPN

All locations can establish either site-to-site VPN or remote access VPN.



28


Refer to the exhibit. A packet is being sent from Host A to Host B through the VPN tunnel between R1 and R3. When the packet first arrives at R3, what are the source and destination IP addresses of the packet?

---Source 192.168.1.2 - Destination 192.168.4.2

Source 192.168.3.1 - Destination 192.168.3.2

Source 192.168.2.1 - Destination 192.168.3.2

Source 192.168.3.1 - Destination 192.168.4.2



29
Which three statements accurately describe a security policy? (Choose three.)

--It creates a basis for legal action if necessary.

---It defines a process for managing security violations.

It defines acceptable and unacceptable use of network resources.

The remote access policy is a component of the security policy that governs acceptable use of e-mail systems.

It is kept private from users to prevent the possibility of circumventing security measures.

---It provides step-by-step procedures to harden routers and other network devices.



30
A technician has been asked to run Cisco SDM one-step lockdown on the router of a customer. What is the result of running these tests?

Security testing is performed and the results are saved as a text file stored in NVRAM.

All traffic entering the router is quarantined and checked for viruses before being forwarded.

---The router is tested for potential security problems and any necessary changes are made.

Traffic is only forwarded from SDM-trusted Cisco routers.



31


Refer to the exhibit. A new client Host A sent a DHCPDISCOVER message to the DHCP server located on a different subnet. How is the DHCPOFFER message sent to Host A by the DHCP server?

as a unicast using the Layer 2 MAC address of the server as a source address and the Layer 2 address of Host A as a destination address

---as a unicast using the Layer 2 MAC address of the server as a source address and the Layer 2 address of the router as a destination address

as a broadcast to all nodes on the subnet 172.1.16.10.0/24 using the Layer 2 MAC address of the server as a source address

as a broadcast to all nodes on subnet 172.16.10.0/24 using the Layer 2 MAC address of the router as a source address



32
What are two main components of data confidentiality? (Choose two.)

checksum

digital certificates

---encapsulation

--encryption

hashing



33


Refer to the exhibit. Which statement is true regarding the configuration shown?

DLCI 110 has global significance.

Point-to-point interfaces utilize bandwidth more efficiently.

The IP address should have been configured on interface Serial0/0.

The encapsulation should have been configured on the subinterface.

---This configuration will have fewer split horizon problems without suffering from routing loops.



34
Which statement is true regarding wildcard masks?

The wildcard mask and subnet mask perform the same function.

The wildcard mask is always the inverse of the subnet mask.

---A "0" in the wildcard mask identifies IP address bits that must be checked.

A "1" in the wildcard mask identifies a network or subnet bit.



35
The SDM homepage for a router displays which three pieces of information? (Choose three.)

ARP cache

---amount of total and available flash memory

routing table

--number of configured LAN interfaces

--if a DHCP server is configured

number of routers on the LAN



36


Refer to the exhibit. What types of switching technologies are used to carry voice and data traffic over the WAN connections shown in Scenario 1 and Scenario 2?

Scenario 1: packet switching
Scenario 2: packet switching

--Scenario 1: circuit switching
Scenario 2: circuit switching

Scenario 1: circuit switching
Scenario 2: packet switching

Scenario 1: packet switching
Scenario 2: circuit switching



37
What functionality do access control lists provide when implementing dynamic NAT on a Cisco router?

defines which addresses are excluded from the NAT pool

defines which addresses are assigned to a NAT pool

defines which addresses are allowed out of the router

--defines which addresses can be translated



38
While troubleshooting a failed VPN connection, a technician opens an SDM connection to a router and notices a message box with a login button, a configured IPSec policy, and that the router is configured as a DMVPN hub. What is the most likely cause of the failed connection?

The connection has been administratively closed on the other end of the connection.

The VPN tunnel has failed due to problems at the physical layer.

The timeout interval is set too low to allow the tunnel to be maintained.

--XAUTH has been enabled for the tunnel, and the username and password must be supplied.



39
A network administrator must provide WAN connectivity between a central office and three remote sites: Orlando, Atlanta, and Phoenix. The Orlando and Atlanta remote offices receive sales orders and transmit shipping confirmations to the Central office consistently throughout the day. The Phoenix remote office consists of one salesperson traveling through the southwest territory. The salesperson occasionally needs to connect to the Central office for e-mail access. What two methods could the network administrator recommend to connect the remote sites to the Central office? (Choose two.)

--Connect to the Atlanta and Orlando remote offices with Frame Relay connections.

Connect to the Atlanta and Orlando remote offices with ISDN connections.

Connect to the Atlanta and Orlando remote offices with POTS dial-up connections.

Connect to the Phoenix remote office with a Frame Relay connection.

---Connect to the Phoenix remote office with a POTS dial-up connection.



40


Refer to the exhibit. The link between the CTRL and BR_1 routers is configured as shown in the exhibit. Why are the routers unable to establish a PPP session?

The CHAP passwords must be different on the two routers.

The clock rate must be 56000.

Interface serial 0/0 on CTRL must connect to interface serial 0/1 on BR_1.

The IP addresses are on different subnets.

----The usernames are misconfigured.

The clock rate is configured on the wrong end of the link.









41


Refer to the exhibit. What are two reasons that explain why the workstation with the IP address 192.168.1.153/28 fails to access the Internet? (Choose two.)

---The NAT inside interfaces are not configured properly.

The NAT outside interface is not configured properly.

----The router is not properly configured to use the access control list for NAT.

The NAT pool is not properly configured to use routable outside addresses.

The access control list does not include the IP address 192.168.1.153/28 to access the Internet.



42
Which two statements are true regarding the Security Wheel? (Choose two.)

Testing can be done with IDS tools.

Monitoring can be done using tools like SATAN, Nessus, or NMap.

----Steps taken to secure the network should be based on the security policy.

The improve phase of the Security Wheel describes the initial implementation of the guidelines in the security policy to secure the network.

----Securing the network requires an adequate threat defense using packet filtering and HIPS, secure connectivity via VPNs, and secure trust relations using authentication.



43


Refer to the exhibit. A technician has been asked to troubleshoot a failed connection between two routers. What can be determined by analyzing the output shown? (Choose two.)

The physical connection between the two routers has failed.

----The failure occurs in an OSI layer other than layers 1 and 2.

Encapsulation should be changed to PPP to solve the problem.

---The bandwidth has been set to the value of a T1 line.

The IP address of S0/0 is invalid, given the subnet mask being used.



44
Which protocol should be chosen to support WAN connectivity in a multi-vendor system and provide strong security through authentication?

NAT with DHCP

Frame Relay

HDLC with encryption

HDLC with CHAP

PPP with PAP

---PPP with CHAP



45


Refer to the exhibit. R1 is performing NAT overload for the 10.1.1.0/24 inside network. Host A has sent a packet to the web server. What is the destination IP address of the return packet from the web server?

10.1.1.2:1234

---172.30.20.1:3333

10.1.1.2:3333

172.30.20.1:1234

192.168.1.2:80



46
What three statements describe the roles of devices in a WAN? (Choose three.)

---A CSU/DSU terminates a digital local loop.

A modem terminates a digital local loop.

A CSU/DSU terminates an analog local loop.

---A modem terminates an analog local loop.

---A router is commonly considered a DTE device.

A router is commonly considered a DCE device.



47


Refer to the exhibit. The network administrator is trying to back up the router Cisco IOS software and receives the output shown. The network administrator also cannot ping the TFTP server. What should be done to solve this problem?

Make sure that the Cisco IOS checksum is valid.

---Start the TFTP server software on the TFTP server.

Confirm there is enough room on the TFTP server for the Cisco IOS software.

Make sure that the router has a route to the network where the TFTP server resides.



48
An administrator has been asked to implement broadband connections for all teleworkers in the department. Which three options, if available in the area, would satisfy this request? (Choose three.)

--cable

dialup

--DSL

IEEE 802.11g

ISDN

--satellite



49
At what physical location does the responsibilty for a WAN connection change from the user to the service provider?

demilitarized zone (DMZ)

---demarcation point

local loop

cloud



50


Refer to the exhibit. Which three statements are true? (Choose three.)

NAT overloading is enabled.

---Dynamic NAT is enabled.

---Address translation will fail.

---Interface configurations are incorrect.

The host with an address of 192.168.1.255 will be translated.

Traffic entering serial interface 0/0/2 is translated before exiting serial interface 0/0/0.



51
Which two statements are true regarding IPv6? (Choose two.)

--It is inherently more secure than IPv4.

It can only be configured on an interface that does not have IPv4 on it.

--It can automatically configure the IPv6 addresses on end devices.

Routing efficiency is slightly reduced because of the length of IPv6 addresses.

There is no way to translate between IPv4 addresses and IPv6 addresses.



52
A technician is talking to a colleague at a rival company and comparing DSL transfer rates between the two companies. Both companies are in the same city, use the same service provider, and have the same rate/service plan. What is the explanation for why Company A reports higher download speeds than Company B?

Company B has a higher volume of POTS voice traffic than Company A.

Company B shares the conection to the DSLAM with more clients than Company A.

Company A only uses microfilters on branch locations.

---Company A is closer to the service provider.



53
Which two statements are true regarding network attack mitigation? (Choose two.)

Using non-alphanumeric characters prevents a brute-force password attack.

Using secure passwords is the best way to mitigate reconnaissance attacks.

Using payload encryption helps to mitigate attacks using malicious code, such as worms or viruses.

---DoS and DDoS attacks prevent legitimate users from using network devices and are not easily mitigated.

User education helps prevent social engineering and the spread of viruses.



54
Which three items are LCP options that can be configured for PPP? (Choose three.)

---CHAP

---Stacker

IPCP

CDPCP

---Multilink



55


Refer to the exhibit. How is the TCP/IP information specified by the default-router and dns-server commands made available to the clients in the network 10.0.1.0/24?

Each of the addresses must be manually configured on each of the network clients.

---The TCP/IP information is dynamically configured on each network client.

The TCP/IP information is available on the DHCP server only.

The TCP/IP information is excluded on the DNS server only.



56
What effect would the Router1(config-ext-nacl)# permit tcp 172.16.4.0 0.0.0.255 any eq www command have when implemented inbound on the f0/0 interface?

All traffic from any network destined for the Internet is permitted.

All traffic from 172.16.4.0/24 is permitted anywhere on any port.

---Traffic originating from 172.16.4.0/24 is permitted to all port 80 destinations.

All TCP traffic is permitted, and all other traffic is denied.

The command is rejected by the router because it is incomplete.



57


Refer to the exhibit. A host connected to Fa0/0 is unable to acquire an IP address from this DHCP server. The output of the debug ip dhcp server command shows "DHCPD: there is no address pool for 192.168.1.1". What is the problem?

The 192.168.1.1 address has not been excluded from the DHCP pool.

---The pool of addresses for the 192Network pool is incorrect.

The default router for the 192Network pool is incorrect.

The 192.168.1.1 address is already configured on Fa0/0.



58
After examining server logs, a network administrator noticed that most of the servers on the network were probed for open TCP ports 80 and 8080 by an unknown remote user. Which type of attack would this most likely represent?

access

Trojan horse

---reconnaissance

denial of service



59
What is a major characteristic of a worm?

malicious software that copies itself into other executable programs

tricks users into running the infected software

a set of computer instructions that lies dormant until triggered by a specific event

---exploits vulnerabilities with the intent of propagating itself across a network



60
Which statement is true about the metro Ethernet packet-switched WAN technology?

Requires the network address to be assigned to the subscriber to establish a switched virtual circuit (SVC).

---Provides a switched, high-bandwidth network capable of managing data, voice, and video all on the same infrastructure.

Requires a DLCI number to be assigned to the subscribers to establish a permanent virtual circuit (PVC).

Provides permanent voice connectivity to the public switched telephone network (PSTN).



61


Refer to the exhibit. When does Router1 apply the dynamic access list named testlist to interface fa0/0?

15 seconds after receiving Telnet traffic from 10.1.1.1/24

when a Telnet session to 10.1.1.1/24 is authenticated

immediately after receiving traffic on port 23 from 10.1.1.1/15

immediately after receiving traffic from the 10.1.1.0/24 network destined for the 172.16.1.0/24 network



62
Which three statements are true about creating and applying access lists? (Choose three.)

Access list entries should filter in the order from general to specific.

---One access list per port per protocol per direction is permitted.

Standard ACLs should be applied closest to the source while extended ACLs should be applied closest to the destination.

---There is an implicit deny at the end of all access lists.

---Statements are processed sequentially from top to bottom until a match is found.

The inbound keyword refers to traffic entering the network from the router interface where the ACL is applied.



63


Refer to the exhibit. What happens if the network administrator issues the commands shown when an ACL called Managers already exists on the router?

The commands overwrite the Managers ACL that is already on the router.

---The commands are added at the end of the Managers ACL that is already on the router.

The commands are added at the beginning of the Managers ACL that is already on the router.

The network administrator receives an error stating that the ACL already exists.



64


Refer to the exhibit. Which two conclusions can be drawn from the output shown? (Choose two.)

---This network is experiencing congestion.

The Frame Relay connection is in the process of negotiation.

Data is not flowing in this network.

----The network is discarding eligible packets.

The DLCI is globally significant.



65
What can a network administrator do to recover from a lost router password?

perform a reload or reset

telnet from another router and issue the show running-config command to view the password

---boot the router to ROM monitor mode and configure the router to ignore NVRAM when it initializes

boot the router to bootROM mode and enter the b command to load the IOS manually