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Each interface on a Cisco ASA has a security level. By default the ASA ACL allows traffic from higher to lower security level, but not the other way around.

Question: When I add an additional ACL rule, does the implicit rule still apply if my inserted rule doesn't match?

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No, specific rule takes the implicit ANY->ANY LESS SECURE rule down. If your rule is not matched, the packet will proceed to the implicit DENY.

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