An auditor is reviewing a firewall configuration. They see a rule at the bottom of the Access Control List (ACL) that says 'DENY ALL'. What is this practice called?

Answer options:

Implicit Deny / Default Deny

Explicit Allow

Stateful Inspection

Port Forwarding

How to approach this question

Identify the security best practice of 'Block everything unless I say otherwise'.

Full Answer

A.Implicit Deny / Default Deny✓ Correct

A 'Default Deny' or 'Implicit Deny' rule ensures that any traffic not specifically allowed by a preceding rule is blocked. This is a fundamental security best practice.

Common mistakes

Confusing the technology (Stateful) with the policy (Deny).

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