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Refer to the exhibit. EIGRP has been configured on routers R1 and R2. However, R1 does not show R2 as a neighbor and does not accept routing updates from R2. What could be the cause of the problem?
Correct Answer: D
Explanation/Reference: Explanation EIGRP updates always use the primary IP address of the outgoing interface as the source address. In this case R2 will use the 10.1.2.2/24 address, which is not in the same subnet of R1, to send EIGRP update to R1. Therefore R1 does not accept this update and generates the not on common subnet error message. Answer D is a bit unclear. It should state that EIGRP cannot form neighbor relationship and exchange routing updates if the two primary addresses on two routers are not in the same subnet. Notice that although R1 does not accept R2 as its EIGRP neighbors but R2 accepts R1 as its EIGRP neighbor accepts R1 hello packets.. For more information about this problem, please read http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a008009 3f09.shtml.