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1. Establishing Serial Point-To-Point Connections
Introducing Wide-Area Networks
Lecture 8
© 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—5-1

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

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

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

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

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

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

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

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

10. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—5-9