Section 7. Extending the LAN

Exploring Wireless Networking

In recent years, business's need for network mobility has made wireless LANs (WLANs) common in today's networks. Unlike wired LANs, wireless devices transmit and receive data using radio frequencies (RF) or infrared signals. These frequencies or signals are sent through an access point (AP).

The AP is like a hub or switch on a wired LAN and is the connectivity point for all wireless devices to access the network.

WLANs are based on IEEE standards that define physical and data-link specifications. Because the standards define Layer 1 and Layer 2 specifications, higher-layer protocols such as IP and IPsec can function on WLANs.

The IEEE standards on WLANs, such as 802.11a/b/g, use unlicensed ...

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