Discussion
Which of the following field of the TCP header tells how many bytes may be sent starting at the byte acknowledged ?
Answer: B
The window size field of the TCP header tells how many bytes may be sent starting at the byte acknowledged. It is the receiver's advertised window and is used for flow control.
The TCP header length field gives the size of the header in words. The acknowledgement number is the number of the next byte expected. The urgent pointer shows the position of urgent data in the segment. None of these says how many bytes may be sent, so the window size is the answer.
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