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isro 2015 set c

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Q   An ACK  number of 1000 in TCP always means that

option 

a) 999 bytes have been successfully received.

b) 1000 bytes have been successfully received.

c) 1001 bytes have been successfully received.

d) none of the above

2 Answers

1 1 vote
ACK number is always next expected sequence numbers so it should be (A)
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Answer is D.

TCP is expecting the next packet numbered 1000. TCP looks at the packet with largest sequence number among received packets and add 1 as the ACK number, even if there are packets that were missed from the previous sliding window. It doesn't guaranteed that previous 999 packets have been successfully received.
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