Aspire Faculty ID #17529 · Topic: UGC NET Computer Science August 2024 (Paper II) · Just now
UGC NET Computer Science August 2024 (Paper II)

Consider the three-way handshaking process followed during TCP connection establishment between two hosts A and B. Let S and R be two random 32-bit starting sequence numbers chosen by A and B respectively. Suppose A sends a TCP segment having SYN bit = 1, SEQ number = S and ACK bit = 0 and B accepts the connection request.

Which one of the following choices represents the information present in the TCP segment header that is sent by B to A ?

Solution

TCP 3-way handshake:


Step 1

A → B


SYN = 1

SEQ = S


Step 2

B → A


SYN = 1

ACK = 1

SEQ = R

ACK = S + 1


Thus correct header fields:


SYN = 1

SEQ = R

ACK = 1

ACK = S + 1

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