© 2002, Cisco Systems, Inc. All rights reserved.
Establishing Serial
Point-to-Point Connections
Module 7
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.
4
Wide-Area Networking Review
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
WAN Overview
WANs connect remote sites.
Connection requirements vary depending on user requirements, cost, and availability.
WAN Connection Types: Layer 1
Provider assigns connection parameters
to subscriber.
Interfacing Between
WAN Service Providers
Serial Point-to-Point Connections
Typical WAN Encapsulation Protocols: Layer 2
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.