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This article introduces the relevant knowledge of "what communication protocols are used on the Internet". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The basic communication protocol used on the Internet is "TCP/IP". "TCP/IP" is the transmission control protocol / Internet protocol, which refers to the protocol suite that can realize the transmission of information between many different networks, and it is the most basic communication protocol in the use of the network. The TCP/IP transport protocol defines the standards and methods for communication among various parts of the Internet.

The operating environment of this tutorial: windows10 system, Dell G3 computer.

The basic communication protocol used on the Internet is TCP/IP.

TCP/IP (Transmission Control Protocol/Internet Protocol, Transmission Control Protocol / Internet Protocol) is a suite of protocols that can transfer information between different networks. TCP/IP protocol not only refers to TCP and IP protocols, but also refers to a protocol suite composed of FTP, SMTP, TCP, UDP, IP and other protocols. Only because TCP and IP protocols are the most representative of TCP/IP protocols, they are called TCP/IP protocols.

TCP/IP transport protocol, that is, transmission control / network protocol, is also called network communication protocol. It is the most basic communication protocol in the use of network. The TCP/IP transport protocol defines the standards and methods for communication among various parts of the Internet. Moreover, TCP/IP transmission protocol is two important protocols to ensure the timely and complete transmission of network data information. Strictly speaking, TCP/IP transport protocol is a four-layer architecture, including the application layer, transport layer, network layer and data link layer.

TCP/IP protocol is the most basic protocol of Internet, in which the main protocols of the application layer are Telnet, FTP, SMTP, etc., which are used to receive data from the transport layer or transmit the data to the transport layer according to different application requirements and methods; the main protocols of the transport layer are UDP and TCP, which are the channels for users to use the platform and the internal data of the computer information network, which can realize data transmission and data sharing. The main protocols of the network layer are ICMP, IP, IGMP, which are mainly responsible for the transmission of data packets in the network, while the network access layer, also known as the network interface layer or data link layer, the main protocols are ARP, RARP, the main functions are to provide link management error detection, to effectively deal with the details of different communication media and so on.

The composition of TCP/IP protocol

The TCP/IP protocol refers to the architecture of OSI to some extent. The OSI model has seven layers, including physical layer, data link layer, network layer, transport layer, session layer, presentation layer and application layer from bottom to top. But this is obviously a bit complicated, so in the TCP/IP protocol, they are reduced to four levels.

Application layer: the application layer is the first layer of the TCP/IP protocol, which provides services for the application process directly.

(1) for different kinds of applications, they will use different protocols in the application layer according to their own needs. Mail transport applications use SMTP protocols, World wide Web applications use HTTP protocols, and remote login service applications use TELNET protocols.

(2) the application layer can also encrypt, decrypt and format data.

(3) the application layer can establish or disconnect with other nodes, which can fully save network resources.

Transport layer: as the second layer of the TCP/IP protocol, the transport layer plays a mainstay role in the whole TCP/IP protocol. And in the transport layer, TCP and UDP also play a mainstay role.

Network layer: the network layer in the TCP/IP protocol is located in layer 3. In the TCP/IP protocol, the network layer can establish and terminate the network connection and find the IP address and other functions.

Network interface layer: in the TCP/IP protocol, the network interface layer is located in layer 4. Because the network interface layer merges the physical layer and the data link layer, the network interface layer is not only the physical medium for transmitting data, but also provides an accurate line for the network layer.

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