Transport Layer Session Establishment: How It Is Done
TCP Connection Establishment
Session Termination
TCP Three-way Handshake Analysis
These are the functions of the three-way handshake:
- It establishes that the destination device is present on the network.
- It verifies that the destination device has an active service and is accepting requests on the destination port number that the initiating client intends to use.
- It informs the destination device that the source client intends to establish a communication session on that port number.
After the communication is completed the sessions are closed, and the connection is terminated. The connection and session mechanisms enable TCP reliability function.
Control Bits Field
The six control bits flags are as follows:
- URG – Urgent pointer field significant
- ACK – Acknowledgment flag used in connection establishment and session termination
- PSH – Push function
- RST – Reset the connection when an error or timeout occurs
- SYN – Synchronize sequence numbers used in connection establishment
- FIN – No more data from sender and used in session termination
Search the internet to learn more about the PSH and URG flags.
Action Point
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