TAILIEUCHUNG - Lecture LAN extension into a WAN: Establishing a Point-to-Point WAN Connection with PPP

After completing this chapter, students will be able to understand: Typical WAN Encapsulation Protocols, leased Line, Point-to-Point considerations, HDLC and Cisco HDLC, PPP Authentication Protocols: PAP,. Inviting you to refer. | LAN Extension into a WAN Establishing a Point-to-Point WAN Connection with PPP Typical WAN Encapsulation Protocols Purpose: This figure introduces students to various encapsulation options to use over the various physical connections. Emphasize: In order to exchange traffic over a WAN link, the packets must be encapsulated into a Layer 2 frame. There are a variety of Layer 2 encapsulation types available that can be used, depending on the WAN connection being used. Some of the types are listed the figure. Encapsulation must be configured on the router when configuring the interface. Some of these encapsulation types will be seen again in the following chapters. In an ISDN environment, the Point-to-Point Protocol (PPP) is the B channel’s Layer 2 encapsulation. Link Access Procedure on the D channel (LAPD) is the encapsulation for the D channel. Either the proprietary Cisco or Internet Engineering Task Force (IETF) (defined in RFC 1490) encapsulations are the Layer 2 encapsulations for

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