© 2006 Cisco Systems, Inc. All rights reserved. ICND v Establishing Serial Point-To-Point Connections Introducing Wide-Area Networks

© 2006 Cisco Systems, Inc. All rights reserved. ICND v Outline Overview WAN Overview WAN Connection Types WAN Components WAN Cabling Layer 2 Encapsulation Protocols Summary

© 2006 Cisco Systems, Inc. All rights reserved. ICND v WAN Overview WANs connect remote sites. Connection requirements vary depending on user requirements, cost, and availability.

© 2006 Cisco Systems, Inc. All rights reserved. ICND v WAN Connection Types: Layer 1

© 2006 Cisco Systems, Inc. All rights reserved. ICND v Provider assigns connection parameters to subscriber Interfacing Between WAN Service Providers

© 2006 Cisco Systems, Inc. All rights reserved. ICND v Serial Point-to-Point Connections

© 2006 Cisco Systems, Inc. All rights reserved. ICND v Typical WAN Encapsulation Protocols: Layer 2

© 2006 Cisco Systems, Inc. All rights reserved. ICND v Summary A WAN makes data connections across a broad geographic area so that information can be exchanged between distant sites. WAN connection types include leased line, circuit-switched, and packet-switched. WAN components that the provider assigns to your organization include CPE, demarcation, local loop, CO switch, and toll network. 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, a variety of Layer 2 protocols can be used, including HDLC, PPP, SLIP, X.25/LAPB, Frame Relay, and ATM.

© 2006 Cisco Systems, Inc. All rights reserved. ICND v2.35-9