GATE | GATE-CS-2015 (Set 1) | Question 65

Suppose two hosts use a TCP connection to transfer a large file. Which of the following statements is/are False with respect to the TCP connection?

1. If the sequence number of a segment is m, then the sequence 
   number of the subsequent segment is always m+1.
2. If the estimated round trip time at any given point of time
   is t sec, the value of the retransmission timeout is always
   set to greater than or equal to t sec.
3. The size of the advertised window never changes during the 
   course of the TCP connection.
4. The number of unacknowledged bytes at the sender is always 
   less than or equal to the advertised window 

(A) 3 only
(B) 1 and 3 only
(C) 1 and 4 only
(D) 2 and 4 only


Answer: (B)

Explanation: TCP sequence number of a segment is the byte number of the first byte in the segment. For example, if the segment contains 500 bytes which are from 1000 to 1499, then sequence number of the segment would be 1000 and sequence number of next segment would be 1500.

Receiver window changes when TCP data is processed by application layer of receiver side.

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