Which of the following TCP commands are used to allocate a receiving buffer associated with the specified connection?

Which of the following TCP commands are used to allocate a receiving buffer associated with the specified connection?
A . Send
B . Close
C . None
D . Receive
E . Interrupt

Answer: D

Explanation:

The Receive command is used to allocate a receiving buffer associated with the specified connection. An error is returned if no OPEN precedes this command or the calling process is not authorized to use this connection.

Answer option A is incorrect. The Send command causes the data contained in the indicated user buffer to be sent to the indicated connection.

Answer option C is incorrect. The Abort command causes all pending SENDs and RECEIVES to be aborted.

Answer option B is incorrect. The Close command causes the connection specified to be closed.