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Cisco Networking Simplified, Second Edition by Paul Della Maggiora, Neil Anderson, Jim Doherty

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Chapter . WAN Network Design

Moving Traffic Across the Street and the World

How does a company connect the network in its New York office to the network in its Los Angeles office? It doesn’t make sense to run a private cable across the U.S. Instead, the company subscribes to wide-area services. A wide-area network (WAN) is a network that covers a broad geographic area and often uses transmission facilities provided by service providers. WAN functionality occurs at Layers 1 to 3 in the Open Systems Interconnection (OSI) reference model.

The bicoastal company just mentioned would contact its service provider to purchase WAN connectivity between the offices. WAN services are leased from service providers that charge either a monthly flat fee or fees ...

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