Multiple choice

By default, how is IP traffic filtered in a Cisco router?

  1. Blocked in and out of all interfaces.

  2. Blocked on all inbound interfaces, but permitted on all outbound interfaces.

  3. Permitted in and out of all interfaces.

  4. Blocked on all outbound interfaces, but permitted on all inbound interfaces.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cisco routers permit all IP traffic by default on all interfaces unless access lists are applied. The 'permit any any' implicit rule exists in both directions. This default behavior allows traffic to flow freely until explicitly restricted by the administrator through ACLs.

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