Certified Network Defender (CND) — Question 162

Which of the following is a 16-bit field that identifies the source port number of the application program in the host that is sending the segment?

Answer options

• A. Sequence Number
• B. Header Length
• C. Acknowledgment Number
• D. Source Port Address

Correct answer: D

Explanation

The correct answer is D, as the Source Port Address identifies the originating application’s port. The other options refer to different components of the segment; for instance, the Sequence Number tracks the order of segments, the Header Length specifies the size of the header, and the Acknowledgment Number indicates the next sequence number expected from the sender.