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GATE CSE 2025 Session 1 Q22: TCP flags in the three-way handshake

Question

Consider the 3-way handshaking protocol for TCP connection establishment. Let the three packets exchanged during the connection establishment be denoted as P1, P2, and P3, in order. Which of the following option(s) is/are TRUE with respect to TCP header flags that are set in the packets?

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Select all correct options. No negative marking, no partial marks.
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Answer: B, D (official GATE 2025 final answer key)

Concept used: Three-way handshake: SYN, then SYN+ACK, then ACK.

First step: Write the three segments: client SYN, server SYN-ACK, client ACK (with SYN = 0).

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Source: official GATE 2025 Session 1 CS question paper and final answer key, organised by IIT Roorkee. Question paper · Answer key

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