tcp/ip is the communication protocol of the Internet. TCP/IP (Transmission Control Protocol/Internet Protocol) refers to a protocol suite that can realize information transmission between multiple different networks. It is the most basic communication protocol in the use of networks; TCP/IP transmission protocol plays a vital role in various parts of the Internet. Standards and methods for conducting communications are specified. The TCP/IP transmission protocol is strictly a four-layer architecture, including the application layer, transport layer, network layer and data link layer.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
tcp/ip is the communication protocol of the Internet.
TCP/IP (Transmission Control Protocol/Internet Protocol, Transmission Control Protocol/Internet Protocol) refers to a protocol suite that can realize information transmission between multiple different networks. TCP/IP protocol not only refers to the two protocols TCP and IP, but refers to a protocol cluster composed of FTP, SMTP, TCP, UDP, IP and other protocols, just because in the TCP/IP protocol, the TCP protocol and IP protocol The most representative, so it is called TCP/IP protocol.
TCP/IP transmission protocol, namely transmission control/network protocol, is also called network communication protocol. It is the most basic communication protocol used in networks. The TCP/IP transport protocol stipulates the standards and methods for communication between various parts of the Internet. Moreover, TCP/IP transmission protocols are two important protocols that ensure timely and complete transmission of network data information. The TCP/IP transmission protocol is strictly a four-layer architecture, including the application layer, transport layer, network layer and data link layer.
Composition of TCP/IP protocol:
Four levels in TCP/IP protocol.
Application layer: The application layer is the first layer of the TCP/IP protocol and directly provides services to the application process.
(1) Different types of applications will use different protocols in the application layer according to their own needs. Mail transmission applications use the SMTP protocol, World Wide Web applications use the HTTP protocol, and remote login service applications use the There is TELNET protocol.
(2) The application layer can also encrypt, decrypt, and format data.
(3) The application layer can establish or terminate connections 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 entire TCP/IP protocol. And in the transport layer, TCP and UDP also play the mainstay role.
Network layer: The network layer is located at the third layer of the TCP/IP protocol. In the TCP/IP protocol, the network layer can perform functions such as establishing and terminating network connections and searching for IP addresses.
Network interface layer: In the TCP/IP protocol, the network interface layer is located on the fourth layer. Since 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.
Features:
The TCP/IP protocol can develop rapidly and become a de facto standard because it just meets the needs of data communication around the world. It has the following characteristics:
(1) The protocol standard is completely open, can be used by users for free, and is independent of specific computer hardware and operating systems.
(2) It is independent of the network hardware system, can run on the wide area network, and is more suitable for the Internet.
(3) Network addresses are uniformly allocated, and each device and terminal in the network has a unique address.
(4) High-level protocol standardization can provide a variety of reliable network services.
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