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Are you wondering what WAN protocol your company uses to connect to the internet? If you have a T1 leased line or a private network between locations, chances are you're utilizing one of these three common WAN protocols: HDLC, PPP, or Frame Relay. In this article, we'll focus on the Point-to-Point Protocol (PPP).
The Point-to-Point Protocol (PPP) is a data link layer (layer 2) protocol that encapsulates network layer frames for transmission over various physical links, such as serial cables, cellular networks, and fiber optic cables. PPP offers more features than HDLC and is an open standard protocol.
Link Control Protocol (LCP): LCP is the core protocol used by PPP for link establishment and configuration. It operates at the data link layer and performs the following functions:
Network Control Protocol (NCP) Layer: NCPs enable PPP to transport various network layer protocols such as IP, IPX, and AppleTalk over the PPP link.
Configuring PPP: To configure PPP, you'll need to set up the appropriate PPP options on the serial links between routers and PCs. This typically involves configuring authentication methods, link quality monitoring, and network layer protocols.
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