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Extra info for Knowledgenet Building Cisco Remote Access Networks BCRAN Student Guide v2 2

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All rights reserved. Copyright © 2005, Cisco Systems, Inc. 2 Copyright 2005, Cisco Systems, Inc. Lesson 2 Defining WAN Encapsulation Protocols Overview It is important to understand how to select the appropriate WAN encapsulation type to provide the correct access and security level for the customer. This lesson describes the various WAN encapsulations and explains the advantages and disadvantages of each. Objectives Upon completing this lesson, you will be able to describe the characteristics of the different WAN encapsulation types.

WAN connection types are dedicated, on-demand circuit-switched, packet-switched, and broadband. • Dedicated connections are continuously available, typically using a CSU/DSU to connect to service provider time-division multiplexing (TDM) network. • Asynchronous on-demand circuit-switched connections use a process such as DDR when there is a backup connection needed. ©2005 Cisco Systems, Inc. All rights reserved. ) • Circuit-switched ISDN connections use Link Access Procedure on the D channel (LAPD) for BRI signaling and use T1/E1 facilities for PRI connections.

The choice of protocol depends on the WAN technology and the communicating equipment. Typical WAN protocols include: PPP: PPP originally emerged as an encapsulation protocol for transporting IP traffic over point-to-point links. PPP also established a standard for the assignment and management of IP addresses, asynchronous (start/stop) and bit-oriented synchronous encapsulation, network protocol multiplexing, link configuration, link quality testing, and error detection. In addition, PPP established option negotiation for such capabilities as network-layer address negotiation and data-compression negotiation.

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