Cisco Certified Network Associate (CCNA) Practice Exam

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Study for the Cisco Certified Network Associate (CCNA) exam with our comprehensive quiz featuring multiple-choice questions and detailed explanations. Prepare effectively and enhance your understanding of networking concepts!

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Which of the following is a requirement for two routers to form an EIGRP adjacency?

Matching MAC addresses
Matching K values and AS value
Identical routing tables
Same operating system version

The correct answer is: Matching K values and AS value

The requirement for two routers to form an EIGRP adjacency is that they must have matching K values and Autonomous System (AS) value. EIGRP (Enhanced Interior Gateway Routing Protocol) uses the K values to determine the metric for path selection. These values can affect how routes are calculated and need to match for routers to consider each other as neighbors. The Autonomous System value is vital because it indicates the group of routers that are participating in the same routing domain. A mismatch in AS values will prevent the routers from forming an adjacency, as they are essentially operating in different routing domains. Matching MAC addresses or identical routing tables are not necessary conditions for EIGRP adjacency. While it's possible for routers to have different operating system versions, they can still form an adjacency as long as the essential parameters like K values and AS values are aligned.