Functions of OSI and TCP/IP Layers Q.66

66Suppose 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.

Option : B
Explanation : In a TCP connection
If the sequence number of a segments is m. Then it is not necessary the subsequent segment is m + 1, because it depend upon no of packet sent is current segment.
Advertise window can not be fixed it may change on changing the capacity of receiver window.

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