Cisco 642-902 Online Practice Questions and Exam Preparation

Cisco 642-902 Online Questions & Answers

• Question 271:

  Which two routing protocols require a metric to be configured when redistributing routes from other protocols? (Choose two.)

  A. RIP
  B. BGP
  C. IS-IS
  D. OSPF
  E. EIGRP
  A. RIP
  E. EIGRP

  ---

  Metrics must be set manually via configuration when redistributing into RIP and EIGRP, whereas OSPF uses a default value of 20.

  Example: EIGRP router eigrp 1 redistribute ospf 1 metric 1544 5 255 1 1500 redistribute rip metric 1544 5 255 1 1500 network 15.0.0.0

  RIP router rip version 2 redistribute eigrp 1 metric 2 redistribute ospf 1 metric 3 network 16.0.0.0

• Question 272:

  Refer to the exhibit.

  

  EIGRP has been configured on all routers in the network. What additional configuration statement should be included on router R4 to advertise a default route to its neighbors?

  A. R4(config)# ip default-network 10.0.0.0
  B. R4(config)# ip route 0.0.0.0 0.0.0.0 10.1.1.1
  C. R4(config)# ip route 10.0.0.0 255.0.0.0 10.1.1.1
  D. R4(config-router)# default-information originate
  A. R4(config)# ip default-network 10.0.0.0

  ---

  Unlike the ip default-gateway command, you can use ip default-network when ip routing is enabled on the Cisco router. When you configure ip default- network the router considers routes to that network for installation as the gateway of last resort on the router. For every network configured with ip default-network, if a router has a route to that network, that route is flagged as a candidate default route. Gateways of last resort selected using the ip default-network command are propagated differently depending on which routing protocol is propagating the default route. For IGRP and EIGRP to propagate the route, the network specified by the ip default-network command must be known to IGRP or EIGRP. This means the network must be an IGRP- or EIGRP- derived network in the routing table, or the static route used to generate the route to the network must be redistributed into IGRP or EIGRP, or advertised into these protocols using the network command. In this case, the 10.0.0.0 network is indeed being advertised via EIGRP.

  Reference: http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094374.shtml#ip network

• Question 273:

  Refer to the exhibit.

  

  Which two statements are correct regarding the routes to be redistributed into OSPF? (Choose two.)

  A. The network 192.168.1.0 will be allowed and assigned a metric of 100.
  B. The network 192.168.1.0 will be allowed and assigned a metric of 200.
  C. All networks except 10.0.0.0/8 will be allowed and assigned a metric of 200.
  D. The network 172.16.0.0/16 will be allowed and assigned a metric of 200.
  E. The network 10.0.10.0/24 will be allowed and assigned a metric of 200.
  A. The network 192.168.1.0 will be allowed and assigned a metric of 100.
  D. The network 172.16.0.0/16 will be allowed and assigned a metric of 200.

• Question 274:

  Refer to the exhibit.

  

  A new TAC engineer came to you for advice. A GRE over IPsec tunnel was configured, but the tunnel is not coming up. What did the TAC engineer configure incorrectly?

  A. The crypto isakmp configuration is not correct.
  B. The crypto map configuration is not correct.
  C. The network 172.16.1.0 is not included in the OSPF process.
  D. The interface tunnel configuration is not correct.
  A. The crypto isakmp configuration is not correct.

  ---

  The problably cause of lack connectivity is the wrong key value used

• Question 275:

  Refer to the exhibit.

  

  Given the exhibited router output, which command sequence can be added to R1 to generate a default route into the OSPF domain?

  A. default-router
  B. ip default-network
  C. default-information originate always
  D. ip default-gateway
  B. ip default-network

• Question 276:

  Router RTA is configured as follows:

  RTA (config)#router rip RTA(config-router)#network 10.0.0.0 RTA(config-router)#distribute-list 44 in interface BRIO RTA(config-router)#exit RTA(config)#access-list 44 deny 172.16.1.0 0.0.0.255 RTA(config)#access-list 44 permit any

  

  What are the effects of this RIP configuration on router RTA? (Choose two)

  A. no routing updates will be sent from router RTA on interface BRIO to router RTX
  B. router RTA will not advertise the 10.0.0.0 network to router RTX
  C. the route to network 172.16.1.0 will not be entered into the routing table on router RTA
  D. user traffic from the 172.16.1.0 network is denied by access-list 44
  E. the routing table on router RTA will be updated with the route to router RTW
  C. the route to network 172.16.1.0 will not be entered into the routing table on router RTA
  E. the routing table on router RTA will be updated with the route to router RTW

  ---

  Distribute list are used to filter routing updates and they are based on access lists. In this case, an access list of 44 was created to deny the route from network 172.16.1.0/24 so this route will not be entered into the routing table of RTA. But

  the route from RTW can be entered because it is not filtered by the access list A and B are not correct because the distribute list is applied to the inbound direction of interface BRI0 so outgoing routing updated will not be filtered.

  Distribute list just filters routing updates so user traffic from network 172.16.1.0 will not be denied.

• Question 277:

  An engineer has added the following configuration snippet to an implementation planning document. The configuration will be added to Router R1, whose Fa0/0 interface connects to a LAN to which Routers R2 and R3 also connect. R2 and R3 are already EIGRP neighbors with each other. Assuming the snippet shows all commands on R1 related to EIGRP authentication, which answer lists an appropriate comment to be made during the implementation plan peer review?

  key chain fred key 3 key-string whehew interface fa0/0 ip authentication key-chain eigrp 9 fred

  A. The configuration is missing one authentication-related configuration command.
  B. The configuration is missing two authentication-related configuration commands.
  C. Authentication type 9 is not supported; type 5 should be used insteaD.
  D. The key numbers must begin with key 1, so change the key 3 command to key 1.
  A. The configuration is missing one authentication-related configuration command.

  ---

  The configuration requires the ip authentication mode eigrp asn md5 command, which is currently missing. This command enables MD5-style authentication, rather than the default of no authentication. Adding this one command completes the configuration. Any valid key numbers can be used. Also, the 9 in the ip authentication key-chain eigrp 9 fred command refers to the EIGRP ASN, not an authentication type.

• Question 278:

  Refer to the exhibit. The network administrator is trying to configure mutual redistribution between EIGRP and OSPF. Autosummarization in EIGRP 100 AS is disabled. After adding OSPF configuration to router B1, the network administrator checked the routing table of router B2, but none of the EIGRP routes appeared there. To redistribute the EIGRP AS 100 routes into OSPF, which command should be added, or edited, on router B1 under router ospf 10?

  

  A. redistribute eigrp 100 metric-type 1
  B. redistribute eigrp 100 subnets
  C. no auto-summary 10.0.0.0 255.0.0.0
  D. area 0 range 10.10.0.0 255.255.0.0
  B. redistribute eigrp 100 subnets

  ---

  When redistributing into OSPF without keyword "subnets", only classful networks will be redistributed. Classful networks here mean networks with the default major subnet masks (for example 10.0.0.0/8; 180.1.0.0/16; 200.200.200.0/24...).

  In fact, the routing table on the exhibit above is not totally correct. The network 192.168.110.0/24 will be redistributed and shown in the routing table of B2 even if the keyword "subnets" is not used because it belongs to class C with the default subnet mask of class C.

  To make all the networks, including subnets appear in the routing table of B2 we must use keyword "subnets" when redistributing into OSPF. This is also an important thing to remember when redistributing into OSPF.

• Question 279:

  (EIGRP Stub Sim )

  By increasing the first distant office, JS manufactures has extended their business. They configured the remote office router (R3) from which they can reach all Corporate subnets. In order to raise network stableness and lower the memory

  usage and CPU utilization to R3, JS manufactures makes use of route summarization together with the EIGRP Stub Routing feature. Another network engineer is responsible for the implementing of this solution.

  However, in the process of configuring EIGRP stub routing connectivity with the remote network devices off of R3 has been missing.

  

  Presently JS has configured EIGRP on all routers in the network R2, R3, and R4. Your duty is to find and solve the connectivity failure problem with the remote office router R3.

  You should then configure route summarization only to the distant office router R3 to complete the task after the problem has been solved. The success of pings from R4 to the R3 LAN interface proves that the fault has been corrected and the

  R3 IP routing table only contains two 10.0.0.0 subnets.

  Check the answer below

  First we have to figure out why R3 and R4 can not communicate with each other.

  Use the show runningconfig command on router R3

  

  Notice that R3 is configured as a stub receive-only router. The receive-only keyword will restrict the router from sharing any of its routes with any other router in that EIGRP autonomous system. This keyword will also prevent any type of route from being sent. Therefore we will remove this command and replace it with the eigrp stub command: R3#configure terminal R3(config)#router eigrp 123 R3(config-router)#no eigrp stub receive-only R3(config-router)#eigrp stub R3(config-router)#end

  Now R3 will send updates containing its connected and summary routes to other routers. Notice that the eigrp stub command equals to the eigrp stub connected summary because the connected and summary options are enabled by default. Next we will configure router R3 so that it has only 2 subnets of 10.0.0.0 network. Use the show ip route command on R3 to view its routing table R3#show ip route Because we want the routing table of R3 only have 2 subnets so we have to summary sub- networks at the interface which is connected with R3, the s0/0 interface of R4. There is one interesting thing about the output of the show ip route shown abovE. the 10.2.3.0 /24, which is a directly connected network of R3. We can't get rid of it in the routing table no matter what technique we use to summary the networks. Therefore, to make the routing table of R3 has only 2 subnets we have to summarize the other subnets into one subnet. In conclusion, we will use the ip summary-address eigrp 123 10.0.0.0 255.0.0.0 at the interface s0/0 of R4 to summary. R4>enable R4#configure terminal R4(config)#interface s0/0 R4(config-if)#ip summary-address eigrp 123 10.0.0.0 255.0.0.0

  

  

  Now we jump back to R3 and use the show ip route command to verify the effect, the output is shown below: (But please notice that the ip addresses and the subnet masks in your real exam might be different so you might use different ones to solve this question) Just for your information, notice that if you use another network than 10.0.0.0/8 to summary, for example, if you use the command ip summary-address eigrp 123 10.2.0.0 255.255.0.0 you will leave a /16 network in the output of the show ip route command.

  

  But in your real exam, if you don't see the line "10.0.0.0/8 is a summary,....Null0" then you can summary using the network 10.2.0.0/16. This summarization is better because all the pings can work well. Finally don't forget to use the copy running-config startup-config command on routers R3 and R4 to save the configurations. R4(config-if)#end R4#copy running-config startup-config

• Question 280:

  Refer to the exhibit.

  

  On the basis of the configuration provided, how are the Hello packets sent by R2 handled by R5 in OSPF area 5?

  A. The Hello packets will be exchanged and adjacency will be established between routers R2 and R5.
  B. The Hello packets will be exchanged but the routers R2 and R5 will become neighbors only.
  C. The Hello packets will be dropped and no adjacency will be established between routers R2 and R5.
  D. The Hello packets will be dropped but the routers R2 and R5 will become neighbors.
  C. The Hello packets will be dropped and no adjacency will be established between routers R2 and R5.

  ---

  The point of this question is the conditions of OSPF establish adjacency relationship. For ospf, the optional capabilities must set the same between neighbors, but from the exhibit, R5 was configured as a stub area while R2 in area 0 is a normal area. So there will be no adjacent relationship established between routers R2 and R5.