XK0-005 Domain 4: Troubleshooting

SSH host key changed warning. Action?

Multiple choice — select one answer

Answer choices

  1. a. Enable chronyd/systemd-timesyncd sync
  2. b. dmesg for disk errors and smartctl health
  3. c. Verify out-of-band before accepting new key
  4. d. traceroute or tracepath

Architectural breakdown & explanation

Host key changes may indicate MITM.

Correct answer(s): c. Verify out-of-band before accepting new key

Exam domain: Domain 4: Troubleshooting (18% weight on the official guide).

Official documentation & study links

Practice this certification

This page is one question from the CompTIA Linux+ bank. Run a full timed practice exam with domain-weighted random questions in your browser.