© 2002, Cisco Systems, Inc. All rights reserved..

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© 2002, Cisco Systems, Inc. All rights reserved.

2 Establishing Serial Point-to-Point Connections Module 7

© 2002, Cisco Systems, Inc. All rights reserved. ICND v2.0—7-3 Objectives Upon completing this module, you will be able to: Use Cisco IOS commands to configure serial interfaces using HDLC and PPP encapsulation for leased-line connections, given a functioning router Use show commands to identify anomalies in HDLC and PPP encapsulation for leased-line connections, given an operational router Use debug commands to identify events and anomalies in HDLC and PPP encapsulation for leased-line connections, given an operational router

© 2002, Cisco Systems, Inc. All rights reserved. ICND v2.0—7-4 © 2002, Cisco Systems, Inc. All rights reserved. 4 Wide-Area Networking Review

© 2002, Cisco Systems, Inc. All rights reserved. ICND v2.0—7-5 Objectives Upon completing this lesson, you will be able to: Describe leased-line, circuit-switched, and packet-switched networks Define terms used by WAN service providers including CPE, demarcation, local-loop, CO, and toll network Identify the five serial standards supported by Cisco devices Describe the major WAN protocols including HDLC, PPP, SLIP, X.25, Frame Relay, and ATM

© 2002, Cisco Systems, Inc. All rights reserved. ICND v2.0—7-6 WAN Overview WANs connect remote sites. Connection requirements vary depending on user requirements, cost, and availability.

© 2002, Cisco Systems, Inc. All rights reserved. ICND v2.0—7-7 WAN Connection Types: Layer 1

© 2002, Cisco Systems, Inc. All rights reserved. ICND v2.0—7-8 Provider assigns connection parameters to subscriber. Interfacing Between WAN Service Providers

© 2002, Cisco Systems, Inc. All rights reserved. ICND v2.0—7-9 Serial Point-to-Point Connections

© 2002, Cisco Systems, Inc. All rights reserved. ICND v2.0—7-10 Typical WAN Encapsulation Protocols: Layer 2

© 2002, Cisco Systems, Inc. All rights reserved. ICND v2.0—7-11 Summary A WAN makes data connections across a broad geographic area so that information can be exchanged between distant sites. Some of the WAN connection types available are leased line, circuit-switched, and packet-switched. Cisco routers support the EIA/TIA-232, EIA/TIA-449, V.35, X.21, and EIA/TIA-530 standards for serial connections. To encapsulate data for crossing a WAN link, you can choose from a variety of Layer 2 protocols, including HDLC, PPP, SLIP, X.25/LAPB, Frame Relay, and ATM.