What are the common network communication protocols

In the computer network, you can always see the figure of the network communication protocol. So, what are the common network communication protocols?

In the computer network, you can always see the figure of the network communication protocol. So, what are the common network communication protocols?

What are the common network communication protocols

Multiple computers can be connected through a computer network, but the computers in the same network must comply with certain rules when connecting and communicating. This is like a car driving on a road that must comply with traffic rules.

In computer networks, these rules of connection and communication are called network communication protocols, which have unified regulations on the transmission format, transmission rate, and transmission steps of data, and both parties must comply with it at the same time to complete data interaction.

There are many kinds of network communication protocols, the most widely used currently are TCP/IP (Transmission Control Protocol/Internet Protocol), UDP (User Datagram Protocol, User Datagram Protocol) and others Protocol groups of some protocols.

In order to reduce the complexity of network programming design, most networks adopt layered design methods. The so-called hierarchical design is to decompose the overall function of the network into functional layers according to the flow of information. The same protocol is used between the same functional layers on different machines, and the adjacent functional layers on the same machine pass through interfaces. Information transfer.

TCP/IP protocol (also known as TCP/IP protocol cluster) is a set of communication protocols used to realize network interconnection. Its name comes from the two important protocols in the protocol cluster, TCP protocol and IP protocol, based on TCP/IP protocol The network hierarchy of the reference model is relatively simple, divided into four layers, as shown in Figure 1.

The four-layer structure in the TCP/IP protocol is the link layer (also called the network interface layer), the network layer, the transport layer, and the application layer. Each layer is responsible for different communication functions. Next, we will explain in detail the four-layer structure:

• Link layer: The link layer is used to define the physical transmission channel, usually a drive protocol for certain network connection devices, such as the drive provided for optical fiber and twisted pair.
• Network layer: The network layer is the core of the entire TCP/IP protocol. It is mainly used to group the transmitted data and send the grouped data to the target computer or network.
• Transport layer: Mainly enable network programs to communicate. In network communication, TCP protocol or UDP protocol can be used.
• Application layer: Mainly provide services for various network applications in the Internet.