|  | 4.1 | PPP
| 4.1.2 | PPP components
PPP addresses the problems of Internet connectivity by employing three main components: A method for encapsulating datagrams over serial links. PPP uses High-Level Data Link Control (HDLC) as a basis for encapsulating datagrams over point-to-point links. A Link Control Protocol (LCP) for establishing, configuring, and testing the data-link connection. A family of Network Control Protocols (NCPs) for establishing and configuring different network-layer protocols. PPP is designed to allow the simultaneous use of multiple network-layer protocols. Today, PPP supports other protocols besides IP, including Internetwork Packet Exchange (IPX) and Appletalk. As shown in the Figure, PPP uses its NCP component to encapsulate multiple protocols.
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