Firewall is a device that filters access to the protected network from the outside network. Firewalls can filter the packets on the basis of

(A) Source IP Address

(B) Destination IP Address

(C) TCP Source Port

(D) UDP Source Port

(E) TCP Destination Port

1. A(A), (B) and (C) only
2. B(B) and (E) only
3. C(C) and (D) only
4. D(A), (B), (C), (D) and (E) only

Pick an option to check yourself, or open the answer below.

Show answer & explanation

Correct answer: D. (A), (B), (C), (D) and (E) only

Explanation

A packet-filter firewall can match source and destination IP addresses and TCP or UDP source and destination ports.