Point-to-point protocol
Point-to-point protocol
(also PPP)
Point-to-point protocol definition
Point-to-point protocol is a data link layer protocol used to establish a direct connection between two nodes in a network. It is commonly used to connect a computer to the internet through a telephone line or a DSL modem. Point-to-point protocol provides a standard method for transporting multi-protocol data packets over point-to-point links.
PPP is a successor to the serial line internet protocol and has several advantages over it, like error detection and correction, automatic negotiation of connection parameters, and supporting multiple network protocols.
See also: node
How does the point-to-point protocol work?
- Connection. The PPP session starts with a physical layer connection, like dial-up or DSL. The PPP protocol is then initialized on both ends of the connection.
- Establishing a link. The link control protocol is used to establish and configure the PPP link between the two nodes. It negotiates link parameters, detects link quality, and authenticates the connection.
- Authentication. PPP supports various authentication methods to ensure secure communication between the two nodes. The authentication process is typically initiated by the ISP server, which requests the user’s credentials.
- Data transfer. With the PPP link established and the network protocol negotiated, data can be transferred between the two nodes.
- Termination. The PPP session is terminated when either the user or the ISP server disconnects. The PPP protocol releases all resources used by the session and resets the link.