Introduction to tcp protocol (TCP/IP) and TCP/IP

Introduction to tcp protocol (TCP/IP) and TCP/IP

Role of the transport layer: the IP layer provides point-to-point connections, and the transport layer provides end-to-end connections.

Transport Layer Protocol

1. TCP (Transmission Control Protocol) Transmission Control Protocol

Reliable and connection-oriented protocols

Low transmission efficiency

2. User Data Protocol (UDP)

Unreliable, connectionless service

High Transmission Efficiency

What is TCP? Or how does TCP work?

1. Connection and disconnection

2. Traffic Control

3. Congestion Control

4. Error Control

5. Timer

TCP frame format

TCP connection, three-way handshake

The sequence diagram is as follows:

Four TCP disconnections

The sequence diagram is as follows: