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Chapter 8: Fundamental Networks 7Describe a LANA local-area network (LAN) is a group of interconnected devices that is under the sameadministrative control, as shown in Figure 8-2. In the past, LANs were considered to besmall networks that existed in a single physical location. Although LANs can be as small asa single local network installed in a home or small office, over time, the definition of LANshas evolved to include interconnected local networks consisting of many hundreds ofdevices, installed in multiple buildings and locations.Figure 8-2Local-Area NetworkThe important thing to remember is that all the local networks within a LAN are under oneadministrative control group that governs the security and access control policies that are inforce on the network. In this context, the word “local” in local-area network refers to localconsistent control rather than being physically close to each other. Devices in a LAN maybe physically close, but this is not a requirement.Describe a WANWide-area networks (WAN) are networks that connect LANs in geographically separatedlocations, as shown in Figure 8-3. The most common example of a WAN is the Internet.The Internet is a large WAN that is composed of millions of interconnected LANs.Telecommunications service providers (TSP) are used to interconnect these LANs at differentlocations.
8 IT Essentials: PC Harware and Software Companion GuideFigure 8-3Wide-Area NetworkDescribe a WLANIn a traditional LAN, devices are interconnected using copper cabling. In some environments,installing copper cabling may not be practical, desirable, or even possible. In thesesituations, wireless devices are used to transmit and receive data using radio waves. Thesenetworks are called wireless LANs (WLAN). Figure 8-4 shows a WLAN. As with LANs,on a WLAN you can share resources, such as files and printers, and access the Internet.Figure 8-4Wireless Local-Area Network
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iiiTrademark AcknowledgmentsAll ter
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vAbout the Technical ReviewersDavid
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ixIdentify the Names, Purposes, and
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CHAPTER 1Introduction to the Person
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CHAPTER 13Advanced Laptops and Port
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CHAPTER 15Advanced NetworksObjectiv
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GlossaryThis glossary defines many
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ase station 3AppleTalk A protocol s
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CMOS battery 5bus topology A networ
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desktop computer 7crosstalk Interfe
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dynamic routing 9Domain Name System
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floppy data cable 11FFast Ethernet
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IEEE 802.11 13Hardware Compatibilit
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three-claw part retriever 27surge s
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zero insertion force (ZIF) socket 3
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