1. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—5-1 Establishing Serial Point-To-Point Connections Introducing Wide-Area Networks

2. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—5-2 Outline Overview WAN Overview WAN Connection Types WAN Components WAN Cabling Layer 2 Encapsulation Protocols Summary

3. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—5-3 WAN Overview WANs connect remote sites. Connection requirements vary depending on user requirements, cost, and availability.

4. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—5-4 WAN Connection Types: Layer 1

5. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—5-5 Provider assigns connection parameters to subscriber Interfacing Between WAN Service Providers

6. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—5-6 Serial Point-to-Point Connections

7. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—5-7 Typical WAN Encapsulation Protocols: Layer 2

8. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—5-8 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.

9. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—5-9