Cisco 200-105 Exam

The loopback interfaces on R4 with the IP addresses of 10.4.4.4/32, 10.4.4.5/32, and 10.4.4.6/32 are not appearing in the routing table of R5. Why are the interfaces missing?

Scenario –
Refer to the topology. Your company has connected the routers R1, R2, and R3 with serial links. R2 and R3 are connected to the switches SW1 and SW2, respectively. SW1 and SW2 are also connected to the routers R4 and R5.
The EIGRP routing protocol is configured.
You are required to troubleshoot and resolve the EIGRP issues between the various routers. Use the appropriate show commands to troubleshoot the issues.

Instructions –
—– Enter the IOS commands on the device to verify the network operations and to find the answers for the multiple-choice questions.
—– THIS TASK DOES NOT REQUIRE DEVICE CONFIGURATION.
—– Click the device to gain access to the console of the device. No console or enable passwords are required.
To access the multiple-choice questions, click the numbered boxes on the left of the top panel.

—– There are four multiple-choice questions with this task. Be sure to answer all four questions before clicking the Next button.The loopback interfaces on R4 with the IP addresses of 10.4.4.4/32, 10.4.4.5/32, and 10.4.4.6/32 are not appearing in the routing table of R5.
Why are the interfaces missing?

  • A. The interfaces are shutdown, so they are not being advertised.
  • B. R4 has been incorrectly configured to be in another AS, so it does not peer with R5.
  • C. Automatic summarization is enabled, so only the 10.0.0.0 network is displayed.
  • D. The loopback addresses havent been advertised, and the network command is missing on R4.
Answer: Option B. Explanation
Explanation: 

For an EIGRP neighbor to form, the following must match:
Neighbors must be in the same subnet
K values
AS numbers
Authentication method and key strings
Here, we see that R4 is configured for EIGRP AS 2, when it should be AS 1.

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