Cisco 642-902 Online Practice Questions and Exam Preparation

Cisco 642-902 Online Questions & Answers

• Question 191:

  In which state do DR and BDR establish adjacency with each OSPF router in the network?

  A. Init State
  B. Exstart State
  C. Exchange State
  D. Loading State
  B. Exstart State

• Question 192:

  Refer to the exhibit.

  

  Routing updates for the 192.168.1.0 network are being received from all three neighbors. Which statement is correct regarding the result of the configuration shown?

  A. The router will prefer the next hop of 172.16.1.1 for packets destined for the 192.168.1.0 network.
  B. The router will prefer the next hop of 172.26.1.1 for packets destined for the 192.168.1.0 network.
  C. The router will advertise the 192.168.1.0 network only to 172.30.1.1.
  D. The router will advertise the 192.168.1.0 network only to 172.26.1.1.
  E. The router will prefer the next hop of 172.26.1.1 for packets except those destined for the
  B. The router will prefer the next hop of 172.26.1.1 for packets destined for the 192.168.1.0 network.

  ---

  The local-preference of the next hop 172.26.1.1 is set to 200, which is higher than the default value (100) so this path is preferred for packets destined to the 192.168.1.0 network.

• Question 193:

  Router E is configured with the EIGRP variance 2 command.

  

  What path will Router E take to reach Router A?

  A. only E-D-A
  B. only E-B-A
  C. only E-C-A
  D. both E-B-A and E-C-A
  E. both E-B-A and E-D-A
  F. all available paths.
  D. both E-B-A and E-C-A

  ---

  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.

• Question 194:

  (Policy Based Routing Sim)

  Company Acne has two links which can take it to the Internet. The company policy demands that you use web traffic to be forwarded only to Frame Relay link and other traffic can go through any links that are available. Use BGP attributes to

  solve the requested action.

  

  1) Create an Access list that catches the HTTP traffic: BorderRouter#access-list 101 permit tcp any any eq www Note that the server was not directly connected to the Border Router. There were a lot of EIGRP routes on it. In the real exam you do not know the exact IP address of the server in the EIGRP network so we have to use the source as "any" to catch all the source addresses. 2) Route map that sets the next hop address to be ISP1 and permits the rest of the traffic: BorderRouter(config)#route-map pbr permit 10 BorderRouter(config-route-map)#match ip address 101 BorderRouter(config-route-map)#set ip next-hop 10.1.101.1 BorderRouter(config-route-map)#exit BorderRouter(config) #route-map pbr permit 20 (NoticE. the route-map pbr permit 20 line allows other traffic than HTTP to be routed. Otherwise, other traffic will be dropped) 3) Apply the route-map on the interface to the server in the EIGRP Network: BorderRouter (config-route-map)#exit BorderRouter(config)#int fa0/0 BorderRouter (config-if)#ip policy route-map pbr BorderRouter(config-if)#exit BorderRouter(config)#exit 4) There is a "Host for Testing", click on this host to open a box in which there is a button named "Generate HTTP traffic". Click on this button to generate some packets for HTTP traffic. Jump back to the BorderRouter and type the command "show route-map". BorderRouter#show route-map In the output you will see the line "Policy routing matches: 9 packets...". It means that the route-map we configured is working properly. First the access list was implemented so that the traffic can be conditioned. Then the router map is configured to set the next hop address to ISP1 and the rest of the traffic is permitted to pass. Since there is EIGRP network, route map is applied on the interface to the server in the EIGRP network.

• Question 195:

  ((EIGRP OSPF Redistribution Sim)

  In this question you need to redistribute between OSPF and EIGRP such that 172.16.100.1 is reachable from router R1.

  

  R2 is an ASBR for EIGRP 100 and OSPF AREA 24 R3 is an ASBR for EIGRP 100 and OSPF AREA 34 NotE. There are TWO separate areas on TWO separate ASBRS thus you need to do redistribution on R2 and R3 R1 is ONLY in EIGRP 100, and is THE ONLY router you can ping from. R4 has a loopback interface that must be pinged from R1. R4 is running OSPF and has redundant links to EIGRP network over R3 router. NotE. You should ping from R1 to 172.16.100.1 network to make sure everything is working correctly.

  Check the answer below

  First we need to find out 5 K-Values used for EIGRP (Bandwidth, Delay, Reliability, Load, MTU) of the s0/0/0 interface (the interface of R2 connected to R4) for redistribution : R2#show interface s0/0/0 Write down these 5 parameters, notice that we have to divide the Delay by 10 because its metric unit is tens of microsecond. For example, we get Bandwidth=1544 Kbit, Delay=20000 us, Reliability=255, Load=1, MTU=1500 bytes then we would redistribute as follows: R2#config terminal R2(config)#router ospf 1 R2(config-router)# redistribute eigrp 100 metric-type 1 subnets R2(config-router)#exit R2(config-router)#router eigrp 100 R2(config-router)#redistribute ospf 1 metric 1544 2000 255 1 1500 (Notice: In fact, these parameters are just used for reference and we can use other parameters with no problem. Also, a candidate said that the simulator didn't accept the Bandwidth of 1544; in that case, we can use a lower value, like 128.) If the delay is 20000us then we need to divide it by 10, that is 20000 / 10 = 2000) For R3 we use the show interface fa0/0 to get 5 parameters too R3#show interface fa0/0 For example we get Bandwidth=10000 Kbit, Delay=1000 us, Reliability=255, Load=1, MTU=1500 bytes R3#config terminal R3(config)#router ospf 1 R3(config-router)#redistribute eigrp 100 metric-type 1 subnets R3(config)#exit R3(config-router)#router eigrp 100 R3(config-router)#redistribute ospf 1 metric 10000 100 255 1 1500

• Question 196:

  What is the benefit of deploying IPv6 in a campus network using dual stack mode?

  A. Dual Stack Mode takes advantage of IPv6 over IPv4 tunnel within a network.
  B. IPv4 and IPv6 run alongside one another and have no dependency on each other to function
  C. IPv4 and IPv6 share network resources.
  D. IPv6 can depend on existing IPv4 routing, QoS, security, and multicast policies.
  B. IPv4 and IPv6 run alongside one another and have no dependency on each other to function

  ---

  Deploying IPv6 in the campus using the dual-stack model offers several advantages over the hybrid and service block models. The primary advantage of a dual stack model is that it does not require tunneling within the campus network. The

  dual stack model runs the two protocols as ships in the night, meaning that IPv4 and IPv6 run alongside one another and have no dependency on each other to function except that they share network resources.

  Both have independent routing.

• Question 197:

  Refer to the exhibit. Which interoperability technique implemented on the dual-stack routers would allow connectivity between IPv6 sites across automatic created tunnels using the 2002::/16 prefix?

  

  A. Dual Stack
  B. NAT-PT
  C. 6to4 tunnel
  D. GRE tunnel
  E. ISATAP tunnel
  C. 6to4 tunnel

  ---

  Reference: http://hcc.dormv6.niu.edu.tw/ hccftp/journal30.pdf (page 166, see Table 1) ~

• Question 198:

  Refer to the exhibit.

  

  A network administrator wants to reduce the number of OSPF routes advertised from Area 1 into Area 2.As the router configuration specialist, what two things would you do to accomplish this goal? (Choose two.)

  A. Enter the configuration on router B1.
  B. Enter the configuration on router B4.
  C. On the same router, enter the Summary-address 10.10.1.0 255.255.255.128 subcommand.
  D. On the same router, enter the Area 1 range 10.10.1.0 255.255.255.128 subcommand.
  E. On the same router, enter the Area 2 range 10.10.1.0 255.255.255.128 subcommand.
  A. Enter the configuration on router B1.
  D. On the same router, enter the Area 1 range 10.10.1.0 255.255.255.128 subcommand.

• Question 199:

  The administrator wants to verify the current state of the OSPF database loading process. Which show command should the administrator use?

  A. show ip ospf [process-id] interface
  B. show ip ospf neighbor
  C. show ip ospf [process-id]
  D. show ip ospf [process-id area-id] database
  B. show ip ospf neighbor

  ---

  The "show ip ospf neighbor" command can be used to view the current state of the OSPF database loading process. In the output below we can see router 2.2.2.2 is in 2way state, router 3.3.3.3 is elected as the BDR and router 4.4.4.4 is the BR.

  

• Question 200:

  Refer to the exhibit. Router B and router C are performing mutual redistribution between OSPF and EIGRP, and their default metrics are configured the same. Router D has equal cost paths to networks where both paths are not really equal cost. For example, network 172.16.54.0 shows equal cost through both router B and router C, though in reality the cost is greater using router C. Other routers, though not shown, are connected to the 172.16.54.0 and 172.16.55.0 networks, and the same issues exist to those routers and the networks connected to them. What can be done so that data will be routed along the most optimal path in the network?

  A. Redistribute connected interfaces on router B and router C.
  B. Set the maximum number of equal cost paths to 1 in all routers.
  C. When redistributing EIGRP into OSPF, set the external metric type to type E1.
  D. Adjust the default metrics in router B and router C so that the values are different in each router.
  E. None of these solutions will fix the problem. Migrate to a single dynamic routing protocol.
  E. None of these solutions will fix the problem. Migrate to a single dynamic routing protocol.

  ---

  From the output, we learn that all the External OSPF routes have metrics of 100 (the second parameters in [110/100]). This is not the default metric of OSPF Type 2 External route (the default value is 20) so the metrics of redistributed routes

  have been modified. Maybe when redistributing into OSPF, the "metric" in the "redistribute" command or the "default-metric" command was used on router B and C to assign the metric of these routes. Something like this:

  router ospf 1

  redistribute eigrp 1 metric 100 subnets

  or

  router ospf 1

  .....

  default-metric 100

  Therefore even if we use the metric type E1 the problem still exists because the link B-D and C-D seems to have the same metric -> the total metrics remains the same .

  We can use route-map and set different metrics for each networks but some unshown networks will have the same issues