Which flags, if any, are set in the TCP segments that carry typed characters as payload? Explain the meaning of these flags.
What will be an ideal response?
PSH|ACK There are six flags in TCP segment.
? URG - urgent point is valid. If set, the following bytes contain an urgent message in the range (SegNo <= urgent message <= SeqNo + urgent pointer).
? ACK – acknowledgement number is valid.
? PSH – notification from sender to receiver that the receiver should clear its buffer by sending all data it has to the application. Normally set by sender when the sender’s buffer is empty.
? RST – causes the receiver to reset the connection. Receiver of a RST terminates the connection and indicates higher layer application about the reset.
? SYN – synchronize sequence numbers sent in the first packet when initiating a connection.
? FIN – used for closing a connection when sender is finished. Both sides of a connection must send a FIN.
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