312-49 Question #307: Real Exam Question with Answer & Explanation

The correct answer is A: 16. In a TCP (Transmission Control Protocol) header, both the Source Port and Destination Port fields are each 16 bits wide, allowing port numbers to range from 0 to 65,535. This is defined in RFC 793. The TCP header structure includes: Source Port (16 bits), Destination Port (16 bit

Submitted by suresh_in· Apr 18, 2026Network Forensics

Question

How many bits is Source Port Number in TCP Header packet?

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Explanation

In a TCP (Transmission Control Protocol) header, both the Source Port and Destination Port fields are each 16 bits wide, allowing port numbers to range from 0 to 65,535. This is defined in RFC 793. The TCP header structure includes: Source Port (16 bits), Destination Port (16 bits), Sequence Number (32 bits), Acknowledgment Number (32 bits), and other fields. Knowing TCP/IP header structure is fundamental for network forensics and security analysis.

Topics

#TCP Header#Source Port Number#Packet Structure#Networking Protocols

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