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XK0-005 Domain 2: Security

Which fail2ban action modifies firewall?

Multiple choice — select one answer

Answer choices

  1. a. net.ipv4.ip_forward=0
  2. b. ban IP via iptables/nftables integration
  3. c. /etc/passwd and critical system files
  4. d. update-ca-trust

Architectural breakdown & explanation

fail2ban triggers firewall blocks on abuse.

Correct answer(s): b. ban IP via iptables/nftables integration

Exam domain: Domain 2: Security (21% weight on the official guide).

Official documentation & study links

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