Wireless (Wi-Fi) networks are just like fixed LANs but instead of using cables, devices are linked by radio waves.
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Each computer in a wireless network requires a wireless network interface card (NIC). These can be built in or you can use plug-in adaptors. These allow each component in the network to communicate with a wireless access point (AP) to create a wireless local area network (WLAN). The AP
Wireless networking
Operates like a router in a fixed LAN. It also provides a bridge which plugs into the hub of a fixed LAN allowing both fixed and wireless users to talk to each other. If your LAN is connected to the Internet, the WLAN can also use, it. If not, you can connect the WLAN to the Internet via an ADSL or cable modem.
What are the advantages of a wireless network? You don't need cabling. In older buildings, it can be expensive to install cables and
Access points. With Wi-Fi, one access point can cover an entire floor or even a building. You can work anywhere within range of the access point. On a sunny day, you could work outside. You can make any room in the house your study. There are now Wi-Fi hotspots in hotels, libraries and, airports so you can link to a network away from home or your office.
There are disadvantages. Fixed LANs can run at 1000 Mbps. Wireless networks are much slower and the further you are from an access point, the slower the rate. Although there are savings on the cost of cabling, wireless NICs are more expensive than the wired versions. Then there is the problem of interference, if a neighbour is using the same channel, and security. Other users may be able to intercept your data. Encryption programs like, Wired Equivalent Privacy (WEP) can help.
KEY TO THE DIAGRAM.
1 A modem providing access to the
Internet.
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