Q21. - (Topic 2) 

Refer to the exhibit. 

When running EIGRP, what is required for RouterA to exchange routing updates with RouterC? 

A. AS numbers must be changed to match on all the routers 

B. Loopback interfaces must be configured so a DR is elected 

C. The no auto-summary command is needed on Router A and Router C 

D. Router B needs to have two network statements, one for each connected network 

Answer: A Explanation: 

Here we required same autonomous system between router A,B,C.Routing updated always exchange between in same EIGRP EIGRP autonomous system.you can configure more than one EIGRP autonomous system on the same router. This is typically done at a redistribution point where two EIGRP autonomous systems are interconnected. Individual router interfaces should only be included within a single EIGRP autonomous system. Cisco does not recommend running multiple EIGRP autonomous systems on the same set of interfaces on the router. If multiple EIGRP autonomous systems are used with multiple points of mutual redistribution, it can cause discrepancies in the EIGRP topology table if correct filtering is not performed at the redistribution points. If possible, Cisco recommends you configure only one EIGRP autonomous system in any single autonomous system. http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f07.shtml 


Q22. - (Topic 3) 

At which layer of the OSI model does PPP perform? 

A. Layer 2 

B. Layer 3 

C. Layer 4 

D. Layer 5 

Answer:

Explanation: 

Point-to-Point Protocol (PPP) is a data link protocol commonly used in establishing a direct connection between two networking nodes. It can provide connection authentication, transmission encryption (using ECP, RFC 1968), and compression. 


Q23. - (Topic 3) 

Refer to the exhibit. 

What is the meaning of the term dynamic as displayed in the output of the show frame-relay map command shown? 

A. The Serial0/0 interface is passing traffic. 

B. The DLCI 100 was dynamically allocated by the router 

C. The Serial0/0 interface acquired the IP address of 172.16.3.1 from a DHCP server 

D. The DLCI 100 will be dynamically changed as required to adapt to changes in the Frame Relay cloud 

E. The mapping between DLCI 100 and the end station IP address 172.16.3.1 was learned through Inverse ARP 

Answer:

Explanation: 

The term dynamic indicates that the DLCI number and the remote router IP address 

172.16.3.1 are learned via the Inverse ARP process. 

Inverse ARP is a technique by which dynamic mappings are constructed in a network, allowing a device such as a router to locate the logical network address and associate it with a permanent virtual circuit (PVC). 


Q24. - (Topic 3) 

Which two options are valid WAN connectivity methods? (Choose two.) 

A. PPP 

B. WAP 

C. DSL 

D. L2TPv3 

E. Ethernet 

Answer: A,C 

Explanation: 

On each WAN connection, data is encapsulated into frames before itcrosses the WAN link. The following are typical WAN protocols:1. High-level Data Link Control (HDLC): The Cisco default encapsulation type onpoint-to-point connections, dedicated links, and circuit-switches connections.2. PPP: Provides router-to-router and host-to-network connections over synchronous andasynchronous circuits. PPP was designed to work with several network layer protocols,including IP.3. Frame-relay: A successor to X.25. This protocol is an industry-standard, switchesdata-link layer protocol that handles multiple virtual circuits 

http://en.wikipedia.org/wiki/Wide_area_network 


Q25. - (Topic 3) 

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 statements represent what is shown?(Choose three.) 

A. 192.168.151.4 represents the IP address of the remote router 

B. 192.168.151.4 represents the IP address of the local serial interface 

C. DLCI 122 represents the interface of the remote serial interface 

D. DLCI 122 represents the local number used to connect to the remote address 

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

F. active indicates that the ARP process is working 

Answer: A,D,E 

Explanation: 

http://www.cisco.com/en/US/docs/ios/12_2/wan/command/reference/wrffr4.html#wp102934 


Q26. - (Topic 3) 

The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command? 

A. This command should be executed from the global configuration mode. 

B. The IP address 10.121.16.8 is the local router port used to forward data. 

C. 102 is the remote DLCI that will receive the information. 

D. This command is required for all Frame Relay configurations. 

E. The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC. 

Answer:

Explanation: 

The command frame-relay map ip 10.121.16.8 102 broadcast means to map the remote IP 

10.121.16.8 to the local DLCI 102. When the “broadcast” keyword is included, it turns Frame Relay network as a broadcast network, which can forward broadcasts. 


Q27. - (Topic 2) 

What can be done to secure the virtual terminal interfaces on a router? (Choose two.) 

A. Administratively shut down the interface. 

B. Physically secure the interface. 

C. Create an access list and apply it to the virtual terminal interfaces with the access-group command. 

D. Configure a virtual terminal password and login process. 

E. Enter an access list and apply it to the virtual terminal interfaces using the access-class command. 

Answer: D,E 

Explanation: 

It is a waste to administratively shut down the interface. Moreover, someone can still access the virtual terminal interfaces via other interfaces -> A is not correct. 

We can not physically secure a virtual interface because it is “virtual” -> B is not correct. 

To apply an access list to a virtual terminal interface we must use the “access-class” command. The “access-group” command is only used to apply an access list to a physical interface -> C is not correct; E is correct. 

The most simple way to secure the virtual terminal interface is to configure a username & password to prevent unauthorized login -> D is correct. 


Q28. - (Topic 1) 

What is one benefit of PVST+? 

A. PVST+ supports Layer 3 load balancing without loops. 

B. PVST+ reduces the CPU cycles for all the switches in the network. 

C. PVST+ allows the root switch location to be optimized per VLAN. 

D. PVST+ automatically selects the root bridge location, to provide optimized bandwidth usage. 

Answer:

Explanation: 

Per VLAN Spanning Tree (PVST) Introduction http://www.cisco.com/en/US/tech/tk389/tk621/tk846/tsd_technology_support_sub-protocol_home.html Per VLAN Spanning Tree (PVST) maintains a spanning tree instance for each VLAN configured in the network. This means a switch can be the root bridge of a VLAN while another switch can be the root bridge of other VLANs in a common topology. For example, Switch 1 can be the root bridge for Voice data while Switch 2 can be the root bridge for Video data. If designed correctly, it can optimize the network traffic. http://www.ciscopress.com/articles/article.asp?p=102157&seqNum=4 

Topic 2, Routing Technologies 


Q29. - (Topic 2) 

A network administrator is troubleshooting an EIGRP problem on a router and needs to confirm the IP addresses of the devices with which the router has established adjacency. The retransmit interval and the queue counts for the adjacent routers also need to be checked. What command will display the required information? 

A. Router# show ip eigrp adjacency 

B. Router# show ip eigrp topology 

C. Router#show ip eigrp interfaces 

D. Router#show ip eigrp neighbors 

Answer:

Explanation: 

Implementing EIGRP http://www.ciscopress.com/articles/article.asp?p=1171169&seqNum=3Below is an example of the show ip eigrp neighbors command. The retransmit interval (Smooth Round Trip Timer – SRTT) and the queue counts (Q count, which shows the number of queued EIGRP packets) for the adjacent routers are listed: R1#show ip eigrp neighbors IP-EIGRP neighbors for process 1 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 

0 10.10.10.2 Fa0/0 12 00:00:39 1282 5000 0 3 


Q30. - (Topic 2) 

Refer to the exhibit. 

Given the output for this command, if the router ID has not been manually set, what router ID will OSPF use for this router? 

A. 10.1.1.2 

B. 10.154.154.1 

C. 172.16.5.1 

D. 192.168.5.3 

Answer:

Explanation: 

CCNA Tutorial: The OSPF Router ID (RID) http://www.thebryantadvantage.com/CCNACertificationExamTutorialOSPFRouterIDRID.ht m 

When determining the Router ID (RID) of an OSPF-enabled router, OSPF will always use the numerically highest IP address on the router’s loopback interfaces, regardless of whether that loopback is OSPF-enabled. 

What if there is no loopback? OSPF will then use the numerically highest IP address of the physical interfaces, regardless of whether that interface is OSPF-enabled.