312-49 Question #335: Real Exam Question with Answer & Explanation

The correct answer is C: 4 billion. TCP uses a 32-bit sequence number field in its header. The number of possible values is 2^32 = 4,294,967,296, which is approximately 4 billion. These sequence numbers are used to ensure reliable, ordered delivery of packets. Understanding the finite sequence space is important in

Submitted by lukas.cz· Apr 18, 2026Network Forensics

Question

How many possible sequence number combinations are there in TCP/IP protocol?

Options

A320 billion
B1 billion
C4 billion
D32 million

Explanation

TCP uses a 32-bit sequence number field in its header. The number of possible values is 2^32 = 4,294,967,296, which is approximately 4 billion. These sequence numbers are used to ensure reliable, ordered delivery of packets. Understanding the finite sequence space is important in security because sequence number prediction attacks (TCP session hijacking) exploit the ability to guess or predict these numbers.

Topics

#TCP/IP#Sequence Numbers#Networking Protocols#TCP Header

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