Which of the following commands preloads and manages existing SSH keys that are used for automatic authentication while logging in to order machines using SSH?

Question

Options

• Asshd
• Bssh-keyring
• Cssh-keygen
• Dssh-pki
• Essh-agent

• A
  5% (2)
• B
  8% (3)
• C
  82% (32)
• D
  3% (1)
• E
  3% (1)

Explanation

There appears to be an error in the provided answer key - the correct answer is actually E. ssh-agent, not C.

ssh-agent is a background process that holds decrypted private SSH keys in memory and provides them automatically to SSH connections, enabling passwordless (or passphrase-free) authentication to remote machines without re-entering credentials each session. You load keys into it via ssh-add, and it manages them for the duration of your session.

The distractors are wrong for these reasons:

• A. sshd is the SSH daemon (server), which listens for incoming connections - it's the remote side, not the key management utility.
• B. ssh-keyring is not a real standard SSH command.
• C. ssh-keygen generates new SSH key pairs (public/private); it does not preload or manage existing keys for authentication.
• D. ssh-pki is not a standard SSH utility.

Memory tip: Think of ssh-agent as a keychain holder - it holds your keys so you don't have to dig them out every time. The "agent" acts on your behalf. Contrast with ssh-keygen (keygen = generate = create new keys) and sshd (the d stands for daemon, the server).

Note for exam takers: If your exam marks C as correct, flag it - the description ("preloads and manages existing SSH keys") definitively describes ssh-agent, not ssh-keygen.

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