Lec-66: TCP connection Establishment and connection Termination | Transport layer

TCP connection Establishment and connection Termination is explained in this video.
TCP is a connection-oriented protocol and every connection-oriented protocol needs to establish a connection in order to reserve resources at both the communicating ends.
A TCP connection is normally terminating using a special procedure where each side independently closes its end of the link. It normally begins with one of the application processes signalling to its TCP layer that the session is no longer needed.

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[sarabjyotsinghmultani]

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I would like to add two things:

1. In first two SYN packets (SYN & SYN+ACK), there is no actual data in TCP segment and its size is 0 byte. However in TCP 3 way handshake these SYN packets are considered to have one byte (which is called ghost byte by some). That is why when both acknowledge each other in 2nd (SYN+ACK) and 3rd packets (ACK), they increment (Sequence Number received from other side+1) which becomes their ACK number, which they send.

2. And final ACK from client also contains no data (0 byte segment), but it is not considered one byte like SYN packets. Hence when client send data packet after 3 way handshake, like http request in this example, it will reuse same sequence number (as it has not sent any data byte in ACK packet) which it used in FINAL ACK packet which will be 9001 as per this example.

[AnkitChaurasiyaVlog]

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Aap bahut hi achchha kaam kar rhe ho
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