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.