What is a point-to-point protocol (PPP)


The English term Point-to-Point Protocol (PPP) is a protocol for dialing into the Internet via which circuit-switched networks are designed. The English term Point-to-Point Protocol is a protocol used to dial in via the Internet via power-switched networks.

For the encapsulation of datagrams there is a development via serial lines and support via the transmission of LAN protocols such as the IP protocol, the Internetwork Packet Exchange Protocol (IPX), DECnet, Appletalk, and the Connectionless Network Protocol (CLNP) using bridges and Routers instead.

The Target Of The PPP Protocol

The PPP protocol aims to remove the restrictions on interoperability that arise due to the bridges and routers, which in turn use the encapsulation technology. This causes the transmission over the vast area connections.

The type and number of identical LAN protocols used by the two communication units make communication only possible if both communication units have the same WAN protocol. This problem is solved accordingly by the PPP protocol, in which routers and bridges help with WAN connections via the manufacturers.

Transfer Of Synchronous And Asynchronous Dial-Up And Leased Lines

The data is then transmitted using the PPP protocol via synchronous and asynchronous dial-up and dedicated lines. So this can work independently of the respective physical interface. The only requirement when using the PPP protocol is an entirely transparent, fully duplex-capable data line.


The PPP protocol is the basis for the data encapsulation protocol, the Link Control Protocol (LCP), and the Network Control Protocol (NCP). The PPP protocol is described, among other things, in various Requests for Comments (RFCs).


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