Two routers, R1 and R2, have established an EIGRP neighbor relationship, but there is still a connectivity problem. Which issue could be causing this problem?

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Question:

Two routers, R1 and R2, have established an EIGRP neighbor relationship, but there is still a connectivity problem. Which issue could be causing this problem?

an access list that is blocking advertisements from other networks
an authentication mismatch
automatic summarization that is disabled on both routers
a process ID mismatch

Explanation: If the EIGRP neighbor relationship is formed between the two routers, but there is still a connection issue, there may be a routing problem, incorrectly configured passive interfaces, or an access list that is blocking advertisements of remote networks.

Exam with this question: CCNP ENARSI 8 Modules 1 - 5 Checkpoint Exam: Routing Concepts and EIGRP Exam