GATE CS 2025 Set 1 — Question 22
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Computer Networks → Transport Layer → TCP Handshake
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Question
Consider the 3-way handshaking protocol for TCP connection establishment. Let the three packets exchanged during the connection establishment be denoted as , , and , in order. Which of the following option(s) is/are TRUE with respect to TCP header flags that are set in the packets?
Correct answer
(B) P2: SYN = 1, ACK = 1; (D) P1: SYN = 1
Solution
In the TCP 3-way handshake:
(A) False, has .
(B) True.
(C) False, has .
(D) True.
- Packet 1 (P1): Client Server. Flags: . This initiates the connection.
- Packet 2 (P2): Server Client. Flags: . This acknowledges the client's SYN and sends its own SYN.
- Packet 3 (P3): Client Server. Flags: . This acknowledges the server's SYN.
(A) False, has .
(B) True.
(C) False, has .
(D) True.
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