Cisco 642-902 Online Practice Questions and Exam Preparation

Cisco 642-902 Online Questions & Answers

• Question 121:

  The following command was issued on R2

  

  Given the above output, which statement is true?

  A. 192.168.1.0 is a static route.
  B. 192.168.1.0 is a summarized route.
  C. 192.168.1.0 is a redistributed route into EIGRP.
  D. 192.168.1.0 is equal path load balancing with 172.16.1.0.
  C. 192.168.1.0 is a redistributed route into EIGRP.

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  Reference:

  http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009487e.shtml (administrative distance, second para)

• Question 122:

  To enable BGP tunneling over an IPv4 backbone, the IPv4 address 192.168.30.1 is converted into a valid IPv6 address. Which three IPv6 addresses are acceptable formats for the IPv4 address? (Choose three.)

  A. 192.168.30.1:0:0:0:0:0:0
  B. 0:0:0:0:0:0:192.168.30.1
  C. ::192.168.30.1
  D. C0A8:1E01::
  E. 192.168.30.1::
  F. ::C0A8:1E01
  B. 0:0:0:0:0:0:192.168.30.1
  C. ::192.168.30.1
  F. ::C0A8:1E01

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  Reference: http://tools.ietf.org/html/rfc4291 (See topic: 2.5.5.1)

• Question 123:

  Which statement is true about IBGP routers?

  A. They must be fully meshed.
  B. They can be in a different AS.
  C. They must be directly connected.
  D. They do not need to be directly connected.
  D. They do not need to be directly connected.

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  When two routers establish a TCP enabled BGP connection, they are called neighbors or peers. Each router running BGP is called a BGP speaker. Peer routers exchange multiple messages to open and confirm the connection parameters, such as the version of BGP to be used. If there are any disagreements between the peers, notification errors are sent and the connection fails. To be a neighbor of BGP no need to be directly connected.

• Question 124:

  Refer to the exhibit.

  

  OSPF has been configured on all routers in the network and Area 1 has been configured as a NSSA. Which statement is true about the NSSA Area 1?

  A. Redistributed RIP and IGRP routes will appear in Area 1. They will be advertised via type 5 LSAs.
  B. Only redistributed RIP routes will appear in Area 1. They will be advertised via type 7 LSAs.
  C. Only redistributed IGRP routes will appear in Area 1. They will be advertised via type 7 LSAs.
  D. No redistributed routes can appear in Area 1, only summary routes.
  C. Only redistributed IGRP routes will appear in Area 1. They will be advertised via type 7 LSAs.

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  Please notice that the IGRP routes are redistributed to NSSA area 1 via LSA Type 7. The NSSA ABR of area 1 will convert it into a LSA Type 5 before flooding to area 0 and area 2.

• Question 125:

  By default, which statement is correct regarding the redistribution of routes from other routing protocols into OSPF?

  A. They will appear in the OSPF routing table as type E1 routes.
  B. They will appear in the OSPF routing table as type E2 routes.
  C. Summarized routes are not accepted.
  D. All imported routes will be automatically summarized when possible.
  E. Only routes with lower administrative distances will be imported.
  B. They will appear in the OSPF routing table as type E2 routes.

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  Type E1 external routes calculate the cost by adding the external cost to the internal cost of each link that the packet crosses while the external cost of E2 packet routes is always the external cost only. E2 is useful if you do not want internal routing to determine the path. E1 is useful when internal routing should be included in path selection. E2 is the default external metric when redistributing routes from other routing protocols into OSPF.

• Question 126:

  OSPF is enabled on router A. You execute the following command on router A and receive the accompanying output:

  RouterA#ping 224.0.0.5 repeat 1

  Type escape sequence to abort.

  Sending 1, 100-byte ICMP Echos to 224.0.0.5, timeout is 2 seconds:

  Reply to request 0 from 10.100.100.1, 4 ms

  10.100.100.1 is the IP address of a loopback interface on router A. What can you conclude about router A?

  A. Only the router A loopback interface is participating in the OSPF routing process.
  B. None of the router A interfaces are participating in the OSPF routing process.
  C. Router A is using the loopback interface IP address as its OSPF router ID.
  D. Router A does not have any reachable OSPF neighbors.
  D. Router A does not have any reachable OSPF neighbors.

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  The 224.0.0.5 address is the multicast for OSPF routers. Therefore when you ping to this address all OSPF routers will reply but from the output we learn that only the local router responded -> Router A does not have any reachable OSPF neighbors.

• Question 127:

  Which of the following are methods EIGRP uses to initially populate (seed) its EIGRP topology table, before learning topology data from neighbors? (Choose two.)

  A. By adding all subnets listed by the show ip route connected command
  B. By adding the subnets of working interfaces over which static neighbors have been defined
  C. By adding subnets redistributed on the local router from another routing source
  D. By adding all subnets listed by the show ip route static command
  B. By adding the subnets of working interfaces over which static neighbors have been defined
  C. By adding subnets redistributed on the local router from another routing source

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  Other than the two listed correct answers, the local router also adds connected routes for which the network command matches the corresponding interfaces, so it may not add all connected routes. Also, EIGRP does not add static routes to the EIGRP topology table, unless those routes are redistributed.

• Question 128:

  Refer to the exhibit.

  

  Router RTR is attempting to establish BGP neighbor relationships with routers RT1 and RT3. On the basis of the information that is presented in the exhibit, which two statements are true? (Choose two)

  A. RTR has a BGP password set but neighbor 10.0.0.1 does not
  B. RTR has a BGP password set but neighbor 10.0.0.5 does not
  C. RTR has a BGP password set but neighbor 10.0.0.1 has an incorrect password set
  D. RTR has a BGP password set but neighbor 10.0.0.5 has an incorrect password set
  E. Neighbor 10.0.0.1 has a BGP password set but RTR does not
  F. Neighbor 10.0.0.5 has a BGP password set but RTR does not
  A. RTR has a BGP password set but neighbor 10.0.0.1 does not
  D. RTR has a BGP password set but neighbor 10.0.0.5 has an incorrect password set

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  You can configure MD5 authentication between two BGP peers, MD5 authentication must be configured with the same password on both BGP peers; otherwise, the connection between them will not be made. If a router has a password configured for a peer, but the other peer does not, a message "No MD5 digest from..." will appear on the console while the routers attempt to establish a Multicast Source Discovery Protocol (MSDP) session between them. Therefore A is correct because RT1 (with an ip address of 10.0.0.1) is not configured with a password. Similarly, if the two routers have different passwords configured, a message "Invalid MD5 digest from..." will appear on the screen.

• Question 129:

  Which BGP feature should be used to avoid high memory utilization on a router?

  A. soft-reconfiguration
  B. route refresh
  C. BGP communities
  D. full-mesh BGP peering
  B. route refresh

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  BGP routers have enormous routing tables so it uses much memory to proceed these routes. When a BGP policy is changed, the BGP session needs to be reset for the policy to take effect. But the resetting results in route churn and route flapping. There are two ways to clear a BGP session without resetting the TCP session between them (this is often called "soft reset"):

  Soft-reconfiguration: stores all received (inbound) routing policy updates without modification in a table so that when a new filter is applied, the router will use this table to calculate the changes without resetting the TCP session between the two BGP peers . This is a memory-intensive (high memory utilization) method and is not recommended.

  Route-refresh: allows a BGP router to request a remote peer resend its BGP Adj-RIB-Out. This allows the BGP router to reapply the inbound policy. The route-refresh capability requires no extra memory on the local router

• Question 130:

  Refer to the exhibit.

  

  ROUTE.com is planning to implement EIGRP load balancing for traffic between hosts on the 172.16.10.0/24 and 172.16.20./24 networks. You have been asked to review the implementation plan for this project. Which statement about the plan is true?

  A. It is complete as written.
  B. It should include a task to configure multipath to equal a value of 2 on R1 and R4.
  C. It should use a ping instead of a traceroute to validate that load balancing has been activated.
  D. It should contain a task that documents the changes made to the configurations.
  A. It is complete as written.

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  This implementation plan is complete because it has all the requirements for an EIGRP load balancing process.