Using TCP or UDP port numbers can help you filter a wide variety of information, including SMTP and POP e-mail messages, NetBIOS sessions, ____, and Network News Transfer Protocol (NNTP) newsgroup sessions.
A) DNS requests
B) ICMP messages
C) stateful transfers
D) Trojan horses

Question

Quizplus · Accepted Answer

DNS requests use port numbers for communication, similar to SMTP, POP, and NNTP, allowing for filtering based on port numbers. ICMP, on the other hand, does not use port numbers as it operates at the network layer, not the transport layer where ports are defined. Stateful transfers and Trojan horses are not specifically related to the use of port numbers for filtering.

Using TCP or UDP Port Numbers Can Help You Filter