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Consider the three-way handshake mechanism followed during TCP connection establishment between hosts P and Q. Let X and Y be two random 32-bit starting sequence numbers chosen by P and Q respectively. Suppose P sends a TCP connection request message to Q with a TCP segment having SYN bit = 1, SEQ number = X, and ACK bit = 0. Suppose Q accepts the connection request. Which one of the following choices represents the information present in the TCP segment header that is sent by Q to P?
Answer: Option 4Concept: In TCP, for Connection Establishment 3-way handshake protocol is used.FIN bit : FIN bit is set while terminating the connection.Syn bit : Syn bit is used for initiating the request for connection establishment.Ack bit : Ack bit is used for indicating that the segment contains the acknowledgment.Sequence Number : In TCP , Sequence number used for counting each byte transferred in a particular connection and in each Segment Header, Sequence number field contains the Sequence number of first byte of data part of the Segment.Ack Number: In TCP , Ack number indicates the Sequence number of Byte expected next.Explanation:GIven: Next segment will be a piggybacked Acknowledgement segment So Ack bit = 1 and Q will increment the Sequence number ( which it received from P) put this into Ack Number field. Syn = 1 as Q will also establish the connection from Q to P and Sequence number will be Y(As given in Question).So , SYN bit = 1 SEQ Number = Y ACK bit = 1 ACK number = X+1 FIN bit = 0. Matches with Option 4.?
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