Cisco 642-902 Online Practice Questions and Exam Preparation

Cisco 642-902 Online Questions & Answers

• Question 291:

  When verifying the OSPF link state database, which type of LSAs should you expect to see within the different OSPF area types? (Choose three.)

  A. All OSPF routers in stubby areas can have type 3 LSAs in their database.
  B. All OSPF routers in stubby areas can have type 7 LSAs in their database.
  C. All OSPF routers in totally stubby areas can have type 3 LSAs in their database.
  D. All OSPF routers in totally stubby areas can have type 7 LSAs in their database.
  E. All OSPF routers in NSSA areas can have type 3 LSAs in their database.
  F. All OSPF routers in NSSA areas can have type 7 LSAs in their database.
  A. All OSPF routers in stubby areas can have type 3 LSAs in their database.
  E. All OSPF routers in NSSA areas can have type 3 LSAs in their database.
  F. All OSPF routers in NSSA areas can have type 7 LSAs in their database.

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  Below summarizes the LSA Types allowed and not allowed in area types:

  

  Popular LSA Types are listed below:

  

• Question 292:

  Refer to the exhibit.

  

  The neighbor 10.1.1.1 weight 200 BGP configuration command has been configured on router A. What will be the result of this configuration?

  A. Router A will prefer the path through router B for network 172.20.0.0
  B. Router A will prefer the path through router C for network 172.20.0.0
  C. Packets from router D will prefer the path through router B for networks advertised by router A
  D. Packets from router D will prefer the path through router C for networks advertised by router A
  A. Router A will prefer the path through router B for network 172.20.0.0

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  The weight attribute is a special Cisco attribute that is used in the path selection process when there is more than one route to the same destination. The higher the weight value, the between the path. The default weight is 0. Therefore, by

  configuring weight 200 to the neighbor 10.1.1.1, Router-A will prefer the path through B for network 172.20.0.0 then the path through Router-C.

  The weight attribute is local to the router and not propagated to other routers. In this case the weight is local to Router-A so it has no effect on the decision of transferring packets from Router-D.

• Question 293:

  Drag each OSPF router type to the approximate description on the left .Not all types are used.

  Select and Place:

  

  

• Question 294:

  Place the BGP commands to the proper locations

  Select and Place:

  

  

• Question 295:

  An IPv6 overlay tunnel is required to communicate with isolated IPv6 networks across an IPv4 infrastructure. There are currently five IPv6 overlay tunnel types. Which three IPv6 overlay tunnel statements are true? (Choose three.)

  A. Overlay tunnels can only be configured between border routers capable of supporting IPv4 and IPv6.
  B. Overlay tunnels can be configured between border routers or between a border router and a host capable of supporting IPv4 and IPv6.
  C. Cisco IOS supports manual, generic, routing encapsulation (GRE), IPv6-compatible, 4to6, and multiprotocol Label Switching (MPLS) Overlay tunneling mechanism.
  D. Cisco IOS supports manual, generic routing encapsulation (GRE), IPv4-compatible, 6to4, and Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) overlay tunneling mechanisms.
  E. A manual overlay tunnel supports point-to-multipoint tunnels capable of carrying IPv6 and Connectionless Network Service (CLNS) packets.
  F. Overlay tunneling encapsulates IPv6 packets in IPv4 packets for delivery across an IPv4 infrastructure.
  B. Overlay tunnels can be configured between border routers or between a border router and a host capable of supporting IPv4 and IPv6.
  D. Cisco IOS supports manual, generic routing encapsulation (GRE), IPv4-compatible, 6to4, and Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) overlay tunneling mechanisms.
  F. Overlay tunneling encapsulates IPv6 packets in IPv4 packets for delivery across an IPv4 infrastructure.

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  B:Overlay tunnels can be configured between border routers or between a border router and a host capable of supporting IPv4 and IPv6. D. Cisco IOS supports manual, generic routing encapsulation (GRE), IPv4-compatible, 6to4, and Intra-

  Site Automatic Tunnel Addressing Protocol (ISATAP) overlay tunneling mechanisms.

  F:Overlay tunneling encapsulates IPv6 packets in IPv4 packets for delivery across an IPv4 infrastructure.

• Question 296:

  Refer to the exhibit.

  

  Router RTA is the hub router for routers RTB and RTC. The Frame Relay network is configured with EIGRP, and the entire network is in autonomous system 1. However, router RTB and RTC are not receiving each other's routes. What is the solution?

  A. Configure the auto summary command under router eigrp 1 on router RTA.
  B. Issue the no ip split horizon command on router RTA.
  C. Configure subinterfaces on the spoke routers and assign different IP address subnets for each subinterface.
  D. Check and change the access lists on router RTA.
  E. Issue the no ip split horizon eigrp 1 command on router RTA.
  F. Configure a distribute list on router RTA that allows it to advertise all routes to the spoke routers.
  E. Issue the no ip split horizon eigrp 1 command on router RTA.

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  Split horizon controls the sending of EIGRP update and query packets. When split horizon is enabled on an interface, these packets are not sent for destinations for which this interface is the next hop. This reduces the possibility of routing loops.

  By default, split horizon is enabled on all interfaces. Split horizon blocks route information from being advertised by a router out of any interface from which that information originated. This behavior usually optimizes communications among multiple routing devices, particularly when links are broken. However, with nonbroadcast networks (such as Frame Relay and SMDS), situations can arise for which this behavior is less than ideal. For these situations, you may want to disable split horizon. In this example, routes received by RTB and RTC are not being sent back out the same serial interface on RTA, so they are not receiving each other's routes. Disabling Split horizons on interface S0/0 on RTA will fix this issue.

• Question 297:

  You have implemented mutual route redistribution between OSPF and EIGRP on a border router. When checking the routing table on one of the OSPF routers within the OSPF routing domain, you are seeing some, but not all of the expected routes.

  Which two things should you verify to troubleshoot this problem? (Choose two.)

  A. The border router is using a proper seed metric for OSPF.
  B. The border router is using a proper seed metric for EIGRP.
  C. The administrative distance is set for OSPF and EIGRP.
  D. The missing EIGRP routes are present in the routing table of the border router.
  E. The subnet keyword on the border router in the redistribute EIGRP command.
  D. The missing EIGRP routes are present in the routing table of the border router.
  E. The subnet keyword on the border router in the redistribute EIGRP command.

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  When troubleshooting EIGRP routes being distributed into OSPF, the first item to check is that the missing EIGRP routes are in fact on the router performing the redistribution (border router). If not, the routes cannot be redistributed into OSPF and troubleshooting should occur within the EIGRP AS.

  The second step is to verify that the subnets keyword has been appended to the redistribute eigrp statement under the OSPF routing process. The question mentions that the networks being redistributed are using a /28 mask, with implies that the networksare actually subnets not assigned to classful boundaries.

  OSPF will only redistribute classful networks by default. The keyword "subnets" allows subnets to also be be redistributed into OSPF (not merely classful routes).

• Question 298:

  During BGP configuration on a router that has peered with other BGP speakers, the BGP command aggregate-address 172.32.0.0 255.255.252.0 is issued. However, the peers do not receive this aggregate network in BGP advertisements. Also, the router does not have this aggregate network in its BGP table. Which option indicates a possible reason this command did not cause the router to advertise the aggregate network to its peers?

  A. Interface NULL 0 is likely shutdown.
  B. The BGP command no synchronization is missing.
  C. The BGP command no auto-summary is missing.
  D. Subnets of 172.32.0.0/22 do not exist in the BGP table.
  E. The IGP running on this router does not have network 172.32.0.0/22 installed.
  F. The next hop IP address must be a loopback address.
  D. Subnets of 172.32.0.0/22 do not exist in the BGP table.

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  BGP allows the aggregation of specific routes into one route using the "aggregate-address address mask" command. Aggregation applies to routes that exist in the BGP routing table. This is in contrast to the network command, which applies

  to the routes that exists in IP routing table. Aggregation can be performed if at least one or more of the specific routes of the aggregate address exists in the BGP routing table.

  Reference:

  http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800945ff.shtml

• Question 299:

  Which two statements are true about EIGRP manual summarization? (Choose two.)

  A. Manual summarization is configured on a per interface basis.
  B. Manual summaries can be configured with the classful mask only.
  C. When manual summarization is configured, autosummarization is automatically disabled by default.
  D. The summary address is assigned an administrative distance of 10 by default.
  E. The summary address is entered into the routing table and is shown to be sourced from the Null0 interface.
  A. Manual summarization is configured on a per interface basis.
  E. The summary address is entered into the routing table and is shown to be sourced from the Null0 interface.

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  You can configure a summary addresses on a per-interface basis. You need to manually define summary addresses if you want to create summary addresses that do not occur at a network number boundary or if you want to use summary addresses on a ASA with automatic route summarization disabled. If any more specific routes are 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.

• Question 300:

  Refer to the diagram. Which OSPF configuration command is required to configure Area 3 as a totally stubby area?

  

  A. On the ABR router ospf 10 area 3 nssa
  B. On the ABR router ospf 10 area 3 stub
  C. On all Area 3 routers router ospf 10 area 3 stub no-summary
  D. On all Area 3 routers router ospf 10 area 3 stub
  E. On the ABR router ospf 10 area 3 stub no-summary
  E. On the ABR router ospf 10 area 3 stub no-summary

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  To make an area "totally stubby" we must apply the "area area-id stub no-summary" command on the ABR (the middle router in this case) and area area-id stub" commands to all other routers in that area.