Understanding known_hosts | LinuC Level 1 102 Exam original practice question

1.10.3Basic

An SSH client compares a previously seen server host key with the key presented now.

Which file stores this comparison data?

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/authorized_keys: Correct. known_hosts records remote host keys.
~/.ssh/known_hosts: Incorrect. authorized_keys is server-side user-key authorization.
~/.ssh/id_ed25519: Incorrect. id_ed25519 is the client's private key.
/etc/shadow: Incorrect. /etc/shadow stores local authentication data.

Detailed explanation

Incorrect~/.ssh/authorized_keys

Correct. known_hosts records remote host keys.

Correct~/.ssh/known_hosts

Incorrect. authorized_keys is server-side user-key authorization.

Incorrect~/.ssh/id_ed25519

Incorrect. id_ed25519 is the client's private key.

Incorrect/etc/shadow

Incorrect. /etc/shadow stores local authentication data.

An example you can run in a temporary verification environment.

printf '%s\n' '~/.ssh/known_hosts stores server host keys'

~/.ssh/known_hosts stores server host keys

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-102-1153

EnvironmentOpenSSH clientのファイル役割

Last technical review2026-08-20