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CCNA Certification All-In-One For Dummies by Silviu Angelescu

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Chapter 7: Introducing Wide-Area Networks (WANs)

Exam Objectives

Describing wide-area networks (WANs)

Describing the purpose of data communication service providers

Differentiating between LAN and WAN operations and features

Identifying different methods for connecting to a WAN

You get acquainted with WANs (wide-area networks) in this chapter. You find out about the various types of WAN connections. The pros and cons of each type of connection are reviewed. You discover more about WANs in Book VII.

Introducing Wide-Area Networks

Wide-area networks span long distances. They interconnect the following:

MANs (metropolitan-area networks)

CANs (campus-area networks)

LANs (local-area networks)

Telecommunication companies build and maintain WANs. Telecom companies lease bandwidth, or dedicated connections, to other companies that need to interconnect their LANs over long distances. The telecom companies that provide shared bandwidth or dedicated connections over their WANs are also called service providers.

Data communication service providers invest in telecommunication infrastructure such as terrestrial and submarine cabling, satellites and earth base stations, microwave base stations, and other wireless links to be able to provide a fast, reliable worldwide data communication infrastructure.

You find four types of WAN connections:

Dedicated leased line

Circuit-switched

Packet-switched

Cell-switched

Dedicated Leased Line Connections

A dedicated leased line is a data ...

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