When configuring Cisco ASA firewall rules, you notice that traffic is being dropped despite an 'allow' access-list. What is the most likely cause?
Trap 1: The interface is not assigned to a security zone
ASA interfaces are assigned to security levels, not zones.
Trap 2: The traffic is encrypted by VPN
VPN traffic is processed by the crypto map, but rules are still applied post-decryption.
Trap 3: Missing 'permit ip any any' at the top
This would permit everything, bypassing the intent of the rules.
- A
The interface is not assigned to a security zone
Why wrong: ASA interfaces are assigned to security levels, not zones.
- B
The traffic is encrypted by VPN
Why wrong: VPN traffic is processed by the crypto map, but rules are still applied post-decryption.
- C
Missing 'permit ip any any' at the top
Why wrong: This would permit everything, bypassing the intent of the rules.
- D
The rule is placed after a 'deny ip any any' rule in the same list
ASA access lists are processed sequentially; the first match wins.