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Q21. - (Topic 3) 

Which two statements about using the CHAP authentication mechanism in a PPP link are true? (Choose two.) 

A. CHAP uses a two-way handshake. 

B. CHAP uses a three-way handshake. 

C. CHAP authentication periodically occurs after link establishment. 

D. CHAP authentication passwords are sent in plaintext. 

E. CHAP authentication is performed only upon link establishment. 

F. CHAP has no protection from playback attacks. 

Answer: B,C 

Explanation: 

Understanding and Configuring PPP CHAP Authentication http://www.cisco.com/en/US/tech/tk713/tk507/technologies_tech_note09186a00800b4131. shtml 

One-Way and Two-Way Authentication CHAP is defined as a one-way authentication method. However, you use CHAP in both directions to create a two-way authentication. Hence, with two-way CHAP, a separate three-way handshake is initiated by each side. In the Cisco CHAP implementation, by default, the called party must authenticate the calling party (unless authentication is completely turned off). Therefore, a one-way authentication initiated by the called party is the minimum possible authentication. However, the calling party can also verify the identity of the called party, and this results in a two-way authentication. One-way authentication is often required when you connect to non-Cisco devices. 


Q22. - (Topic 2) 

Refer to the exhibit. 

A packet with a source IP address of 192.168.2.4 and a destination IP address of 10.1.1.4 arrives at the AcmeB router. What action does the router take? 

A. forwards the received packet out the Serial0/0 interface 

B. forwards a packet containing an EIGRP advertisement out the Serial0/1 interface 

C. forwards a packet containing an ICMP message out the FastEthemet0/0 interface 

D. forwards a packet containing an ARP request out the FastEthemet0/1 interface 

Answer: C Explanation: 

CCNA - EIGRP Common Question http://www.orbitco-ccna-pastquestions.com/CCNA---EIGRP-Common-Question.php 

Looking at the output above, there is no IP route for 10.1.1.4 address on AcmeB routing table. If the router can no find a specific path in its routing table to a particular route,( In this case no path is found so AcmeB) the router will inform the source host with an ICMP message that the destination is unreachable and this will be through the same interface it has received the packet (interface Fa0/0 network 192.168.3.0/28 from the exhibit). 

Topic 3, WAN Technologies 


Q23. - (Topic 3) 

Refer to the exhibit. 

The show interfaces serial 0/1 command was issued on the R10-1 router. Based on the output displayed which statement is correct? 

A. The cable connected to the serial 0/1 interface of the R10-1 router is a DTE cable. 

B. The R10-1 router can ping the router interface connected to the serial 0/1 interface. 

C. The clock rate used for interface serial 0/1 of the R10-1 router is 1,544,000 bits per second. 

D. The CSU used with the serial 0/1 interface of the R10-1 router has lost connection to the service provider. 

E. The interface of the remote router connected to the serial 0/1 interface of the R10-1 router is using the default serial interface encapsulation. 

Answer:

Explanation: 

Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for Cisco HDLC is the default encapsulation type for the serial interfaces. 


Q24. - (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. 


Q25. - (Topic 1) 

Refer to the exhibit. 

Given the output shown from this Cisco Catalyst 2950, what is the reason that interface FastEthernet 0/10 is not the root port for VLAN 2? 

A. This switch has more than one interface connected to the root network segment in VLAN 2. 

B. This switch is running RSTP while the elected designated switch is running 802.1d Spanning Tree. 

C. This switch interface has a higher path cost to the root bridge than another in the topology. 

D. This switch has a lower bridge ID for VLAN 2 than the elected designated switch. 

Answer:

Explanation: These four parameters are examined in order to make root bridge , root port , designated port. Other switch has lowest Sending Bridge ID or Sending Port ID so vlan 2 is not the root port. 

1. A lower Root Bridge ID2. A lower path cost to the Root3. A lower Sending Bridge ID4. A lower Sending Port ID 


Q26. - (Topic 3) 

Which command allows you to verify the encapsulation type (CISCO or IETF) for a Frame Relay link? 

A. show frame-relay lmi 

B. show frame-relay map 

C. show frame-relay pvc 

D. show interfaces serial 

Answer:

Explanation: map will show frame relay encapsulation (cisco or ietf) http://www.cisco.com/en/US/docs/ios/12_2/wan/command/reference/wrffr4.html#wp102934 

"show frame-relay map" will show frame relay encapsulation type (CISCO or IETF) 


Q27. - (Topic 1) 

Which three of these statements regarding 802.1Q trunking are correct? (Choose three.) 

A. 802.1Q native VLAN frames are untagged by default. 

B. 802.1Q trunking ports can also be secure ports. 

C. 802.1Q trunks can use 10 Mb/s Ethernet interfaces. 

D. 802.1Q trunks require full-duplex, point-to-point connectivity. 

E. 802.1Q trunks should have native VLANs that are the same at both ends. 

Answer: A,C,E 

Explanation: 

CCNA Self-Study (ICND Exam): Extending Switched Networks with Virtual LANs http://www.ciscopress.com/articles/article.asp?p=102157&seqNum=2 


Q28. DRAG DROP - (Topic 3) 

Answer: 

Explanation: 

1) a router is this type of device: DTE2) the most common type of virtual circuit: PVC3) provides status messages between DTE and DCE devices: LMI4) identifies the virtual connection between the DTE and the switch: DLCI 

CCNA Certification Test Prep Case Study http://www.thebryantadvantage.com/CCNACertificationExamTutorialDirectlyConnectedSeri alInterfaces.htm Configuring the LMI Type on a Frame Relay Interface http://www.ciscopress.com/articles/article.asp?p=170741&seqNum=3 Frame Relay DLCIs And Mappings http://www.mcmcse.com/cisco/guides/frame_relay_dlci.shtml 


Q29. - (Topic 2) 

Which command is used to display the collection of OSPF link states? 

A. show ip ospf link-state 

B. show ip ospf lsa database 

C. show ip ospf neighbors 

D. show ip ospf database 

Answer:

Explanation: 

http://www.cisco.com/en/US/docs/ios/iproute_ospf/command/reference/iro_osp3.html#wp1 01217 Examples The following is sample output from the show ip ospf database command when no arguments or keywords are used: Router# show ip ospf database OSPF Router with id(192.168.239.66) (Process ID 300) 


Q30. - (Topic 3) 

Which feature does PPP use to encapsulate multiple protocols? 

A. NCP 

B. LCP 

C. IPCP 

D. IPXP 

Answer:

Explanation: 

PPP permits multiple network layer protocols to operate on the same communication link. For every network layer protocol used, a separate Network Control Protocol (NCP) is provided in order to encapsulate and negotiate options for the multiple network layer protocols. It negotiates network-layer information, e.g. network address or compression options, after the connection has been established