Which Cisco IOS command generates the cryptographic key pair that must exist before the router can accept inbound SSH connections?
enable secret 0
ip ssh version 2
line vty 0 4
crypto key generate rsa
The command "crypto key generate rsa" (or its longer variant with parameters) creates the RSA key pair that the SSH server uses for host authentication and session encryption. Until a key pair exists, the router will not start the SSH process. The other commands are important to overall SSH configuration-"ip ssh version 2" selects the protocol version, "enable secret" sets the privileged-mode password, and entering "line vty" accesses the virtual terminal lines-but none of them generate the required keys.
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