Cisco 642-902 Online Practice Questions and Exam Preparation

Cisco 642-902 Online Questions & Answers

• Question 141:

  Which Ipv4-mapped Ipv6 address is equivalent to IPv6 address ::ffff:AC11:AC11?

  A. ::ffff:10.12.10.12
  B. ::ffff:10.14.10.14
  C. ::ffff:44.49.44.49
  D. ::ffff:161.193.161.193
  E. ::ffff:172.17.172.17
  F. ::ffff:193.11.193.11
  E. ::ffff:172.17.172.17

  ---

  Reference: http://www.tcpipguide.com/free/t_IPv6IPv4AddressEmbedding-2.htm

• Question 142:

  Refer to the exhibit.

  

  Which statement is true?

  A. RTA will redistribute the RIP routes into the NSSA as type 7 LSAs. RTB will translate the type 7 LSAs into type 5 LSAs and flood them throughout the OSPF backbone.
  B. RTA will redistribute the RIP routes into the NSSA as type 7 LSAs. RTB will flood the type 7 LSAs throughout the backbone.
  C. RTA will redistribute the RIP routes into the NSSA as type 5 LSAs. RTB will flood the type 5 LSAs throughout the backbone.
  D. RTA will redistribute the RIP routes into the NSSA as type 5 LSAs. RTB will translate the type 5 LSAs into type 7 LSAs and flood them throughout the OSPF backbone.
  E. RTA will not redistribute the RIP routes into the NSSA.
  C. RTA will redistribute the RIP routes into the NSSA as type 5 LSAs. RTB will flood the type 5 LSAs throughout the backbone.

• Question 143:

  Refer to the exhibit.

  

  You are the network administrator of the Route.com company. You have been tasked to implement a hub and spoke EIGRP topology over Frame Relay to provide connectivity between the networks at headquarters and all 300 spokes. Before you begin the actual implementation, which three pieces of information are more important to know than the others? (Choose three.)

  A. the Committed Information Rate of all the Frame Relay PVCs
  B. the Cisco IOS version running on all the routers
  C. the router model number of all the spoke routers
  D. the number of HQ networks connected behind the headquarter routers
  E. the routing policy, such as whether or not the spokes can be used as backup transient point between the two headquarter routers
  A. the Committed Information Rate of all the Frame Relay PVCs
  B. the Cisco IOS version running on all the routers
  E. the routing policy, such as whether or not the spokes can be used as backup transient point between the two headquarter routers

  ---

  You have to know the committed information rate because it is a bandwidth associated with logical connection in a PVC. You also need to know the IOS version on all routers so that there is no conflict in versions. As per the topology, you need to know the routing policy because it will be used as a backup transient point between headquarter routers

• Question 144:

  When the BGP path selection process is being performed on a Cisco router, which BGP attribute is used first when determining the best path?

  A. local preference
  B. MED
  C. weight
  D. origin
  E. next-hop
  F. AS-path
  C. weight

  ---

  Weight is the first attribute BGP uses in the route selection process. Route with a higher weight is preferred when multiple routes exist to the same destination.

• Question 145:

  Click the resources on the left that you need to create an implementation plan for an OSPF project and drag them to the target zone on the right.

  Select and Place:

  

  

• Question 146:

  During a recent OSPF election among three routers, RTA was elected the DR and RTB was elected the BDR, as seen in the graphic. Assume that RTA fails, and that RTB takes the place of the DR while RTC becomes the new BDR. What will happen when RTA comes back online?

  

  A. RTA will take the place of DR immediately upon establishing its adjacencies.
  B. RTA will take the place of DR only if RTB fails.
  C. RTA will take the place of DR only if both RTB and RTC fail.
  D. A new election will take place establishing an all new DR and BDR based on configured priority levels and MAC addresses.
  C. RTA will take the place of DR only if both RTB and RTC fail.

  ---

  If a router with a higher priority value gets added to the network, it does not preempt the DR and BDR. The only time a DR and BDR changes is if one of them is out of service. If the DR is out of service, the BDR becomes the DR, and a new BDR is selected. If the BDR is out of service, a new BDR is elected. In a multi-access network, the router that is powered on first will generally become the DR, since the DR/BDR process is not pre-emptive. Reference:: CCNP Self-Study Second Edition P.243

• Question 147:

  One of the most important characteristics of OSPF is multiple areas. Which statement best describes why this feature is such an important enhancement to earlier routing protocols?

  A. The network domain, when divided into areas, allows for the use of both IANA classful addressing and private addressing.
  B. The use of multiple areas allows for the use of prioritization.
  C. All computation is kept within the area, with minimum communication between the areas, allowing the network to scale to larger sizes.
  D. It is easier to implement security.
  C. All computation is kept within the area, with minimum communication between the areas, allowing the network to scale to larger sizes.

  ---

  Reference: http://www.ciscopress.com/articles/article.asp?p=31577 (OSPF within an area)

• Question 148:

  What are two possible causes for EIGRP Stuck-In-Active routers? (Choose Two)

  A. Some query or reply packets are lost between the routers.
  B. The neighboring router starts receiving route updates from this router.
  C. A failure causes traffic on a link between two neighboring routers to flow in only one direction (unidirectional link).
  D. The neighboring router stops receiving ACK packets from this router.
  A. Some query or reply packets are lost between the routers.
  C. A failure causes traffic on a link between two neighboring routers to flow in only one direction (unidirectional link).

  ---

  Generally, a route shown as Active is going to be there for a very short period of time by the time you repeat the command, hopefully that Active route has gone Passive. Sometimes that doesn′t happen, though, and the route becomes SIA Stuck In Active. A route becomes SIA when a query goes unanswered for so long that the neighbor relationship is reset. From experience, I can tell you that troubleshooting SIA routes is more of an art form than a science, but there are four

  main reasons a route becomes SIA:

  The link is unidirectional, so the query can′t possibly be answered. The queried router′s resources are unavailable, generally due to high CPU utilization.

  The queried router′s memory is corrupt or otherwise unable to allow the router to answer the query.

  The link between the two routers is of low quality, allowing just enough packets through to keep the neighbor relationship intact, but not good enough to allow the replies through.

  To sum it up, routes generally become SIA when a neighbor either doesn

• Question 149:

  Refer to the exhibit.

  

  Which two statements are correct? (Choose two.)

  A. All six routes will be installed in the routing table.
  B. Two routes will be installed in the routing table.
  C. Four routes will be installed in the routing table.
  D. All the routes were redistributed into BGP from an IGP.
  E. All the routes were originated by BGP with the network command.
  C. Four routes will be installed in the routing table.
  D. All the routes were redistributed into BGP from an IGP.

  ---

  Only the valid and best routes (represented by *>) will be installed into the routing table.

  All the routes were redistributed into BGP from an IGP so we will see a next hop of 0.0.0.0. For more information about this type of redistribution please read http://www.cisco.com/en/US/tech/tk365/ technologies_tech_note09186a00800943c5.shtml

• Question 150:

  Refer to the exhibit.

  

  All EIGRP load balancing parameters are set to their defaults. You want to use all the routes in the EIGRP topology for IP load balancing Which two EIGRP subcommands would you use to accomplish this goal? (Choose two.)

  A. traffic-share balanced
  B. distance
  C. maximum-paths
  D. default-network
  E. variance
  C. maximum-paths
  E. variance

  ---

  Notice that the "maximum-paths" command is used to share traffic to equal cost path while the "variance" command can share traffic to unequal cost path.

  In the output above we learn that EIGRP is using 2 successors to send traffic. By using the "variance 2 command we can share traffic to other feasible successor routes. But by default, EIGRP only shares traffic to 4 paths. So we need to use the "maximum-paths 6 to make sure all of these routes are used.