Cisco Certified Network Professional Practice Test 2025 – Your All-in-One Guide to Exam Success!

The command used to display CEF (Cisco Express Forwarding) adjacency details is "show ip cef adjacency." This command provides information about the adjacencies, which are links between routing protocols and the forwarding decision process. In CEF, adjacencies represent the next hop information for packets that are routed through a network, detailing how the packets are forwarded to their destinations. By using this command, network engineers can troubleshoot and optimize the CEF process by examining the relationships between the local routers and their neighbors.

The other options do not serve the same purpose. For instance, "show adjacency details" is not a valid command in Cisco's IOS, as it lacks specificity related to CEF information. Additionally, "show ip cef all" would display comprehensive information about all CEF entries but would not specifically focus on the adjacency details. Lastly, "show ip route adjacency" may relate to routing information but does not pertain directly to CEF adjacencies. Therefore, "show ip cef adjacency" is the precise command required to understand CEF adjacency details.