N10-009 Domain 4: Network Security

Which certificate problem breaks HTTPS trust?

Multiple choice — select one answer

Answer choices

  1. a. SPF/DKIM/DMARC
  2. b. Expired or untrusted CA signature
  3. c. Something you have
  4. d. OSSEC/Wazuh-class HIDS

Architectural breakdown & explanation

Browsers warn on bad cert chains or expiry.

Correct answer(s): b. Expired or untrusted CA signature

Exam domain: Domain 4: Network Security (19% weight on the official guide).

Official documentation & study links

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