What Is a Communications Protocol?

One of the earliest protocols in the open system interconnection protocol, it provides communication support for interconnected networks connecting different operating systems and different hardware architectures, and it is a universal language of the network. The TCP / IP protocol defines how to transfer and manage information (file transfer, email sending and receiving, remote login, etc.) in the Internet and establishes rules that must be followed when errors occur.

Protocol

communication

SNMP Communication protocol SNMP

Where is the communication protocol in the computer

TCP / IP protocol centralized network management protocol. Has been widely adopted. The SNMP management model and the protocol for managing the Internet work at the application layer of TCP / IP. The advantage is that the protocol can be specified without relying on the properties of the network physical layer. A common protocol can be used for all networks and management, and the client / server mode can be used between the manager and the managed person. ); If the manager works as a client, it can be called a manager or management station. The functions of the agent should include the operating system and network management layer.

Protocol

Management, obtain seven layers of information about the object, and use SNMP network management protocol to inform the manager of this information. Managers themselves should require that information about objects be stored in a virtual database of the MIB (Management Information Base) contained in the agent.

For SNMP, it is required to be able to obtain or set the content from the management to the agent network management object itself. The agent should complete what the manager asks for an answer. At the same time, the agent itself should notify the manager of the events that occur due to the agent.

PPP Communication protocol PPP

PPP (pointopointprotocol) formulated as RFC1171 / 1172 is an Internet standard protocol that relays LAN protocols including IP on point-to-point lines. PPP corresponds to multi-protocols from the very beginning, and is designed to have data links that do not depend on network layer protocols. When using PPP to relay each network layer protocol, each network layer protocol must have some specifications corresponding to PPP, and some of these specifications already exist. The actual installation of PPP has begun, especially router manufacturers that must adapt to multiprotocols actively adopt PPP.

PPP is composed of two protocols: one is LCP (Data Link Control Protocol) used to ensure that the data link does not depend on the protocol; the other is to implement the use of network layer protocol control functions in the PPP environment NCP (Network Control Protocol). Starting from its purpose, NCP needs to be specified in each network layer protocol. The specific name of the NCP is different in the corresponding network layer protocol. More precisely, the protocol stipulated by PPP is only LCP. As for how to put NCP and network layer protocols into PPP frames, it is up to manufacturers who develop various network layer protocols. PPP frames have the function of transmitting LCP, NCP and network layer protocols. There are no special restrictions on the physical layer specifications using LCP. Can use RS-232-C, RS-422 / 423, V.35 and other general physical connectors. The application field of the transmission speed is also not specified, and the transmission speed allowed by the physical layer specification can be used. Instead, a full-duplex communication line is used.