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MPLS and VPN Architectures, Volume II by Jeff Apcar, Ivan Pepelnjak, Jim Guichard

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Overview of Access Protocols and Procedures

This section briefly describes the typical protocols that are used in remote access technologies. It serves as a refresher or an introduction to those of you who are not intimately familiar with these protocols. For a more in-depth description of remote access protocols and Cisco IOS configuration guidelines, please refer to Cisco Connect Online (www.cisco.com) under the Technologies section.

PPP

PPP is fundamental to the deployment of nearly all the remote access scenarios discussed in this chapter. PPP provides a link layer service (Layer 2 of the OSI model) between two devices (in this case, the customer device and the PE router), and it can operate over a variety of physical media such as ISDN, ...

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