Adding a private key to ssh-agent | LinuC Level 1 102 Exam original practice question

1.10.3Basic

Use ssh-agent so a generated key's passphrase need not be entered repeatedly.

Which command is appropriate?

Hint 1: Focus on the requirement

Identify what must change and what must remain unchanged. Then choose the command whose scope matches that requirement.

Hint 2: Check each command's role

Separate commands that display information, change state, remove data, or affect a child process.

ssh-add ~/.ssh/id_ed25519: Correct. ssh-add registers the private key.
ssh-keygen -A: Incorrect. ssh-keygen -A generates host keys.
ssh-agent -a ~/.ssh/id_ed25519: Incorrect. ssh-agent -a selects the agent socket.
ssh -A ~/.ssh/id_ed25519: Incorrect. ssh -A enables agent forwarding for a connection.

Detailed explanation

Correctssh-add ~/.ssh/id_ed25519

Correct. ssh-add registers the private key.

Incorrectssh-keygen -A

Incorrect. ssh-keygen -A generates host keys.

Incorrectssh-agent -a ~/.ssh/id_ed25519

Incorrect. ssh-agent -a selects the agent socket.

Incorrectssh -A ~/.ssh/id_ed25519

Incorrect. ssh -A enables agent forwarding for a connection.

An example you can run in a temporary verification environment.

printf '%s\n' 'ssh-add ~/.ssh/id_ed25519'

ssh-add ~/.ssh/id_ed25519

Foundation review

Check whether the command acts on the current shell, a new process, an existing process, or a file.

Use the supplied command and compare the output with the expected result.

Question IDKL-102-1152

EnvironmentOpenSSH clientのコマンド役割

Last technical review2026-08-20