Free Cisco 642-902 Exam Dumps Questions & Answers

In IPv6, the interfaces running OSPF can be configured with multiple address prefixes.
Which statement is true about the IPv6 addresses that can be included into the OSPF process?

• A.  Specific addresses cannot be selected for importation into the OSPF process.
• B.  Specific addresses can be selected using a route map.
• C.  Specific addresses can be selected using an ACL.
• D.  Specific addresses can be selected using a prefix list.

Refer to the exhibit.

The Route.com company is running EIGRP between all the routers. Currently, if one of the LAN links (LAN1 or LAN2) at the headquarters flaps (goes up and down), the HQ-RTR1 and HQ-RTR2 routers will experience high CPU usage and have a long EIGRP convergence time. As the new network administrator, you are asked to investigate this situation and determine if there is a quick way to resolve this issue.
Which is the most important thing that you can quickly verify first to resolve this issue?

• A.  Verify that the HQ-RTR1 and HQ-RTR2 routers are configured for EIGRP Nonstop Forwarding.
• B.  Verify that the bandwidth setting on all WAN links is correct.
• C.  Verify that all the spoke routers are configured as EIGRP stub.
• D.  Verify that all the spoke routers are configured for auto summarization.
• E.  Verify that the HQ-RTR1 and HQ-RTR2 routers are configured to send only a default route to all the spoke routers.

Which two reductions are the correct reductions of the IPv6 address 2001:0d02:0000:0000:0014:0000:0000:0095? (Choose two)

• A.  2001:d02:0:0:14::95
• B.  2001:d02::14:0:0:95
• C.  2001:0d02:::0014:::0095
• D.  2001:d02::14::95

Which statement describes the difference between a manually configured IPv6 in IPv4 tunnel versus an automatic 6to4 tunnel?

• A.  A manually configured IPv6 in IPv4 tunnel allows multiple IPv4 destinations.
• B.  An automatic 6to4 tunnel does not require dual-stack (IPv4 and IPv6) routers at the tunnel endpoints.
• C.  A manually configured IPv6 in IPv4 tunnel does not require dual-stack (IPv4 and IPv6) routers at the tunnel endpoints.
• D.  An automatic 6to4 tunnel allows multiple IPv4 destinations.

CORRECT TEXT
(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.

Correct Answer:

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