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 | 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 Frame Relay. Note: Other encapsulations not shown include AppleTalk Remote Access Protocol (ARAP), Compressed Serial Link Internet Protocol (CSLIP), or Synchronous Data Link Control (SDLC). Transition: We will first look at the HDLC encapsulation. Leased Line Point-to-Point Considerations Advantages Simplicity Quality Availability Disadvantages Cost Limited flexibility HDLC and Cisco HDLC Configuring HDLC Encapsulation RouterX(config-if)# encapsulation hdlc Enables Cisco HDLC encapsulation Uses the default encapsulation on synchronous serial interfaces PPP An Overview of PPP PPP can carry packets from several protocol suites using NCP. PPP controls the setup of several link options using LCP. Purpose: This figure presents an overview of PPP. Emphasize: The figure illustrates the multiple protocols that NCP supports. The two arrows pointing to the router interfaces are where PPP encapsulation occurs. The first bullet summarizes the role of NCP. The second bullet summarizes the role of .
