The key protocols in the WAN Protocol

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WAN protocol is relative to the LAN protocol, and the Internet can be identified as a wide area network. Then the relevant agreement is well understood. is inseparable from the OSI model. Here are a few typical protocols. To everyone as a reference. The

WAN Protocol is a three-tier operation at the bottom of the OSI Reference Model, which defines communication on different WAN media. Mainly used for wide area network communication protocols, such as: Advanced Data Link Control Protocol, Point-to-Point Protocol, digital data network, integrated Services Digital Network, digital subscriber line, X. 25 agreements and so on.

Wide-area network protocol: HDLC Advanced Data Link Control Protocol

HDLC is a bit-based TCP/IP transmission protocol, which is highly efficient and reliable and suitable for a wide range of applications, and is the default protocol used by Ciseo routers. HDLC is one of the most widely used protocols in the data link layer.

WAN Protocol: PPP Point-to-Point Protocol

PPP protocol provides a connection between routers and the host to the network across synchronous and asynchronous circuits. It is mainly used in the wide area Connection mode of "dial-up Internet".

WAN Protocol: DDN Digital data network

DDN is a dedicated line connection, the use of digital channels to transmit data signals of the data transmission network. DDN is a transparent transmission network that supports any protocols, supports the network layer, and any protocol on it. It has high transmission rate, small network delay, can directly transmit high-speed data signal, provide flexible connection mode, can support data, voice, image transmission and other services. DDN not only can connect with the client terminal equipment, but also can connect with the user network, provide the flexible networking environment for the user network interconnection.

WAN Protocol: ISDN Integrated Services Digital Network

ISDN provides users with End-to-end digital communication lines. The basic Rate Interface Service for ISDN provides 2 B channels and one D channel. BRI B Channel is used to transmit the user data, and the D channel mainly transmits the control signal. Because ISDN provides digital channels directly between End-to-end, it has the characteristics of high speed, high quality, high reliability, fast call connection, and can transmit data, voice and image information.

WAN Protocol: X. 25 Technology

X. For more than 25 years, it has been used as the interface standard between the user network and the packet switching network. Is the interface between a data terminal unit and a data circuit terminal unit in which terminals operate in a grouped form on a public data network. X The 25 protocol is a synchronous transmission protocol, which supports error correction and fault diagnosis, which corresponds to the 1-3 layer of the Reference Model of OSI. X The first layer of 25 defines the electrical and physical port characteristics. X The second layer of 25 defines the frame format used for DTE/DCE connections. X The third layer of 25 describes the grouping format and packet switchingThe process.