Which global-configuration command must you enter on a Cisco IOS device to generate the cryptographic keys that allow the SSH server to start and accept remote connections?
service password-encryption
ip ssh version 2
transport input ssh
crypto key generate rsa
The command "crypto key generate rsa" creates the RSA key pair that the IOS SSH server uses for authentication and encryption. Without these keys, SSH remains disabled and any attempt to verify or enable SSH displays the message "Please create RSA keys to enable SSH." The other options either select the SSH version, limit VTY line protocols, or encrypt plaintext passwords but do not generate the required keys, so they do not by themselves enable SSH.
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