A, C, and D. Command-line interfaces can be established through a Telnet session, modem connection, and console connection. Answer B is incorrect. Although TFTP is used to load a new IOS image onto a router, it does not allow you to establish a command-line interface session. Answer E is incorrect, as FTP sessions are not used to establish command-line interface sessions with Cisco routers.
C. Typing show cdp neighbors from user or privileged mode uses the Cisco Discovery Protocol (CDP) to discover any directly connected Cisco device. By adding the detail variable to the command, the router displays the IP address information of the remote devices. This powerful command works at the data link layer of the OSI model and ...
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