An engineer wants to set up simple password protection with no usernames for some switches in a lab, for the purpose of keeping curious coworkers from logging in to the lab switches from their desktop PCs. Which of the following commands would be a useful part of that configuration?
- A login vty mode subcommand
- A password password console subcommand
- A login local vty subcommand
- A transport input ssh vty subcommand
Explanation: To answer this question, it might be best to first think of the complete configuration and then find any answers that match the configuration. The commands, in vty line configuration mode, would be password password and login. Only one answer lists a vty subcommand that is one of these two commands.
Of note in the incorrect answers:
One answer mentions console subcommands. The console does not define what happens when remote users log in; those details sit in the vty line configuration.
One answer mentions the login local command; this command means that the switch should use the local list of configured usernames/passwords. The question stated that the engineer wanted to use passwords only, with no usernames.
One answer mentions the transport input ssh command, which, by omitting the telnet keyword, disables Telnet. While that command can be useful, SSH does not work when using passwords only; SSH requires both a username and a password. So, by disabling Telnet (and allowing SSH only), the configuration would allow no one to remotely log in to the switch.
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