When configuring SSH on a router, which command is used to generate asymmetric RSA keys?

When configuring SSH on a router, which command is used to generate asymmetric RSA keys?

• A. login local
• B. transport input ssh
• C. crypto key generate rsa
• D. configure terminal

Answer: (C)

Generating asymmetric RSA keys for SSH configuration is done using the command that specifically invokes the cryptographic key generation process designed for RSA. The command "crypto key generate rsa" is intended for this purpose, as it initiates the creation of RSA key pairs, which are fundamental for establishing secure SSH connections. These key pairs consist of a public key, which can be shared with clients wishing to connect securely to the router, and a private key, which is kept secret on the router. This asymmetric encryption is crucial in ensuring that data transmitted between the SSH client and the router is protected and cannot be easily intercepted or decrypted. The other options serve different functions within the context of SSH configuration and do not address the key generation specifically. For instance, "login local" pertains to the authentication method used for console access, while "transport input ssh" is used to enable SSH as the transport protocol for a VTY line. Meanwhile, "configure terminal" is a command that simply enters the global configuration mode but does not involve key generation itself. Thus, the correct answer aligns with the necessary function of creating the cryptographic keys essential for SSH security.

Generating asymmetric RSA keys for SSH configuration is done using the command that specifically invokes the cryptographic key generation process designed for RSA. The command "crypto key generate rsa" is intended for this purpose, as it initiates the creation of RSA key pairs, which are fundamental for establishing secure SSH connections.

These key pairs consist of a public key, which can be shared with clients wishing to connect securely to the router, and a private key, which is kept secret on the router. This asymmetric encryption is crucial in ensuring that data transmitted between the SSH client and the router is protected and cannot be easily intercepted or decrypted.

The other options serve different functions within the context of SSH configuration and do not address the key generation specifically. For instance, "login local" pertains to the authentication method used for console access, while "transport input ssh" is used to enable SSH as the transport protocol for a VTY line. Meanwhile, "configure terminal" is a command that simply enters the global configuration mode but does not involve key generation itself. Thus, the correct answer aligns with the necessary function of creating the cryptographic keys essential for SSH security.