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XK0-005 Domain 4: Troubleshooting

Which command checks listening TCP ports?

Multiple choice — select one answer

Answer choices

  1. a. ss -tlnp
  2. b. Non-root cannot bind privileged ports or port in use
  3. c. kern crit in dmesg/journal
  4. d. Crontab syntax, service crond active, and paths

Architectural breakdown & explanation

ss lists listening sockets with processes.

Correct answer(s): a. ss -tlnp

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

Official documentation & study links

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