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CCNA Quick Reference Sheets (CCNA Exam 640-802) by Jim Doherty, Eric Rivard

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Chapter 10. Understanding WAN Technologies

WAN Technologies Overview

WANs connect networks, users, and services across a broad geographic area. Figure 10-1 shows that companies use the WAN to connect company sites and mobile users for information exchange.

WAN Connections

Figure 10-1. WAN Connections

WANs Versus LANs

LANs connect computers, peripherals, and other devices in a building or small geographic area. WANs connect LANs across a wide geographic area. LANs and all devices in the LAN are usually owned by the local organization. Outside service providers own the WAN and WAN devices.

WAN Access and the OSI Model

WANs and their protocols function at Layers 1 and 2 ...

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