220-1002 · Question #527
Which of the following has the ability to allow or deny POP3 traffic on the firewall?
The correct answer is D. Access control list. A firewall Access Control List (ACL) contains rules that explicitly permit or deny traffic based on source/destination IP addresses, protocols, and port numbers. POP3 runs on TCP port 110, so an ACL rule targeting that port controls whether POP3 traffic is allowed or blocked…
Question
Which of the following has the ability to allow or deny POP3 traffic on the firewall?
Options
- AEmail filtering
- BMAC filtering
- CPort security
- DAccess control list
How the community answered
(60 responses)- A5% (3)
- B2% (1)
- C3% (2)
- D90% (54)
Explanation
A firewall Access Control List (ACL) contains rules that explicitly permit or deny traffic based on source/destination IP addresses, protocols, and port numbers. POP3 runs on TCP port 110, so an ACL rule targeting that port controls whether POP3 traffic is allowed or blocked. Email filtering (A) inspects message content but does not control traffic at the port level. MAC filtering (B) is a Layer 2 mechanism tied to device hardware addresses. Port security (C) refers to switch-level MAC address restrictions, not firewall traffic rules.
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