Cisco 642-902 Online Practice Questions and Exam Preparation

Cisco 642-902 Online Questions & Answers

• Question 301:

  When the passive-interface command is used on a router, which two routing protocols will continue to receive routing updates on an interface that is configured as passive? (Choose two.)

  A. OSPF
  B. RIP
  C. RIPv2
  D. EIGRP
  B. RIP
  C. RIPv2

  ---

  You can use the passive-interface command to control the advertisement of routing information. The command enables the suppression of routing updates over some interfaces while it allows updates to be exchanged normally over other

  interfaces. With most routing protocols, such as RIP version 1 and 2, the passive-interface command restricts outgoing advertisements only. However, when used with Enhanced Interior Gateway Routing Protocol (EIGRP) and OSPF, the

  effect is slightly different. The use of the passive- interface command in EIGRP suppresses the exchange of hello packets between two routers, which results in the loss of their neighbor relationship. This stops not only routing updates from

  being advertised, but it also suppresses incoming routing updates. The same is true for OSPF. To stop routers from becoming OSPF neighbors on a particular interface, issue the passive-interface command at the interface.

  References:

  http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f0a.shtml http://www.cisco.com/en/US/tech/tk365/ technologies_q_and_a_item09186a0080094704.sht ml

• Question 302:

  Refer to the exhibit.

  

  The actual speed of the serial links between R2 and R3 are 256 kb/s and 512 kb/s. When configuring EIGRP on routers R2 and R3, the network administrator configured the bandwidth of both serial interfaces to 512 kb/s. What will be the effect?

  A. EIGRP will over utilize the 512 kb/s link.
  B. The interface "delay" value used in the EIGRP metric calculation will be inaccurate on the 256 kb/s serial interface.
  C. The amount of bandwidth used for EIGRP routing protocol traffic on the 256 kb/s link can become excessive.
  D. EIGRP can load balance between the two serial links only if the variance is set to 2 or higher.
  E. Unequal cost load balancing will be disabled.
  C. The amount of bandwidth used for EIGRP routing protocol traffic on the 256 kb/s link can become excessive.

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  If you assign more bandwidth than what is available between R2 and R3, the EIGRP traffic will become excessive because it uses only the actual bandwidth.

• Question 303:

  Refer to the exhibit. Based on the output from the show command on RT1 which statement is true?

  

  A. OSPFv3 uses global IPv6 addresses to establish neighbor adjacencies.
  B. RT1 has a subnet mask of 64 bits.
  C. RT1 has FastEthernet0/0 set as a DR for network type broadcast.
  D. OSPFv3 uses Link-local addresses to establish neighbor adjacencies.
  E. RT1 does not have a global IPv6 address set on FastEthernet0/0.
  F. OSPFv3 uses IPv4 addresses to establish neighbor adjacencies.
  D. OSPFv3 uses Link-local addresses to establish neighbor adjacencies.

  ---

  OSPFv3 is an updated version of OSPF designed to accommodate IPv6 natively. OSPFv3 uses the multicast address FF02::5 and FF02::6, but like EIGRP it uses its link-local address as the source address in advertisements.

• Question 304:

  Refer to the exhibit.

  

  On the basis of the information in the exhibit, which two statements are true? (Choose two.)

  A. The output was generated by entering the show ip bgp command on the ISP router.
  B. The output was generated by entering the show ip bgp command on the SanJose1 router.
  C. The serial 0/0/1 interface on the ISP router has been configured with the set metric 50 command.
  D. The serial 0/0/1 interface on the ISP router has been configured with the set metric 75 command.
  E. When traffic is sent from the ISP to autonomous system 64512, the traffic will be forwarded to SanJose1 because of the lower MED value of SanJose1.
  F. When traffic is sent from the ISP to autonomous system 64512, the traffic will be forwarded to SanJose2 because of the higher MED value of SanJose2.
  A. The output was generated by entering the show ip bgp command on the ISP router.
  D. The serial 0/0/1 interface on the ISP router has been configured with the set metric 75 command.

  ---

  The "show ip route bgp" command will display any BGP-learned routes that make it into the IP routing table, the command "show ip bgp" is required to display the contents of the actual BGP routing table. This output was seen on ISP because the local router ID is 192.168.100.1 (ISP). Since we know that this output must have been seen by ISP, we know the serial 0/0/1 interface has been configured with a metric of 75, as this is the metric to the peer with IP address 192.168.1.2 (the other side of the serial 0/0/1 interface).

• Question 305:

  Refer to the exhibit.

  

  OSPF is configured on all routers in the network. Area 5 is configured as an NSSA area. The RIPv2 routes are redistributed into the OSPF domain on router R5. What two types of LSAs will be originated by router R5? (Choose two.)

  A. type 1 Router LSA
  B. type 2 Network LSA
  C. type 3 Network Summary LSA
  D. type 4 ASBR Summary LSA
  E. type 5 AS External LSA
  F. type 7 NSSA External LSA
  A. type 1 Router LSA
  F. type 7 NSSA External LSA

  ---

  The point of the question is the LSA types in different kinds of areas.

  NSSA area has 4 kinds of LSA : 1, 2 , 3 ,7

  There is no LSA3 because it is produced by ABR to advertise routing entries between OSPF areas. There is no LSA2 because there are serial interface but no fast Ethernet interface, no DR elected, no LSA2. LSA2 is produced by DR.

• Question 306:

  Refer to the exhibit.

  

  

  EIGRP is configured on all routers in the network. On the basis of the output provided, which statement is true?

  A. Because the key chain names do not match, router R1 will not be able to ping routers R2 and R3 .
  B. Because the key strings do not match, router R1 will not be able to ping routers R2 and R3.
  C. Because authentication is misconfigured on interfaces Gi0/0 and Gi0/1 on router R2, router R1 will not be able to ping routers R2 and R3.
  D. Because autosummarization needs to be turned on for EIGRP on all routers, router R1 will not be able to ping routers R2 and R3.
  E. Router R1 will be able to ping routers R2 and R3.
  E. Router R1 will be able to ping routers R2 and R3.

  ---

  Here we see that all of the routers have correctly included the proper networks in the EIGRP process, and the authentication is also correct so all networks would be reachable from R1. Even though the name of the authentication keys are different, the actual keys are identical so authentication will work.

• Question 307:

  The Dev-1 and Dev-3 routers are OSPF neighbors over the Ethernet 0/0 connection. Based on the show ip ospf neighbor output from the Dev-1 and Dev-3 routers, which statement is true?

  

  A. Dev-1 is the DR because it has a higher OSPF router priority.
  B. Dev-1 is the DR because it has a lower OSPF router ID.
  C. Dev-3 is the DR because it has a higher OSPF router priority.
  D. Dev-3 is the DR because it has a lower OSPF router ID.
  E. Both Dev-1 and Dev-3 are using the default OSPF router priority.
  A. Dev-1 is the DR because it has a higher OSPF router priority.

  ---

  The output shown above displays information about the neighbors, so from Dev-3 we see that the priority of Dev-1 is 2, and that Dev-1 is the DR. From Dev-1 we can see that its neighbor (Dev-3) is the BDR and has an OSPF priority of 1.

• Question 308:

  Which three statements are true about EIGRP route summarization? (Choose three.)

  A. Manual route summarization is configured in router configuration mode when the router is configured for EIGRP routing.
  B. Manual route summarization is configured on the interface.
  C. When manual summarization is configured, the summary route will use the metric of the largest specific metric of the summary routes.
  D. The ip summary-address eigrp command generates a default route with an administrative distance of 90.
  E. The ip summary-address eigrp command generates a default route with an administrative distance of 5.
  F. When manual summarization is configured, the router immediately creates a route that points to null0 interface.
  B. Manual route summarization is configured on the interface.
  E. The ip summary-address eigrp command generates a default route with an administrative distance of 5.
  F. When manual summarization is configured, the router immediately creates a route that points to null0 interface.

  ---

  The purpose of route summarization is small routing tables, smaller updates. On major network boundaries, subnetworks are summarized to a single classful network and automatic route summarization is enabled by default. Manual route summarization can be configured on per interface basis. When summarization is configured on an interface, the router immediately creates a route pointing to null0. Route summarization works in conjunction with the ip summary-address eigrp interface configuration command, in which additional summarization can be performed. If automatic summarization is in effect, there usually is no need to configure network level summaries using the ip summary-address eigrp command. You can configure a summary aggregate address for a specified interface. If there are any more specific routes in the routing table, EIGRP will advertise the summary address out the interface with a metric equal to the minimum of all more specific routes

  Reference: http://www.cisco.com/en/US/docs/ios/12_0/np1/configuration/guide/1ceigrp.html

• Question 309:

  Refer to the exhibit.

  

  Which statement is true about the 6.6.6.0/24 prefix?

  A. Route 6.6.6.0/24 is learned by an IBGP peer.
  B. The command neighbor send-community is configured on BGP neighbor 10.10.23.3.
  C. The route 10.10.23.3 is not being advertised to other BGP neighbors.
  D. If another path advertises the 6.6.6.0/24 path and has the default local preference, that path is more preferred.
  B. The command neighbor send-community is configured on BGP neighbor 10.10.23.3.

  ---

  By default, the community attributes are not advertised to BGP neighbors. But in the output we see the "Community: 100:250 which means the command "neighbor ... send- community" was used to send community attributes of the local router to the neighbor.

• Question 310:

  Which command will display EIGRP packets sent and received, as well as statistics on hello packets, updates, queries, replies, and acknowledgments?

  A. debug eigrp packets
  B. show ip eigrp traffic
  C. debug ip eigrp
  D. show ip eigrp interfaces
  B. show ip eigrp traffic

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  The show ip eigrp traffic command displays the number of Enhanced IGRP (EIGRP) packets sent and received.

  Example: The following is sample output from the show ip eigrp traffic command. Router# show ip eigrp traffic IP-EIGRP Traffic Statistics for process 77 Hellos sent/received. 218/205 Updates sent/received. 7/23 Queries sent/received. 2/0 Replies sent/received. 0/2 Acks sent/received. 21/14 Reference:http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_command_ref erence_chapter09186a00800ca5a9.html#wp1018815