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The two chapters in this part describe the features and performance of this important amendment. 11 Mesh Networks Wi-Fi mesh networking will transform both enterprise and public networks. Because the same MAC and PHY layers can be used throughput the span of the network, such networks may see the distinction between WANs and LANs blurring for the first time in the history of computer networking. In addition to widespread municipal deployment, the multipoint capability of Wi-Fi mesh networks has been widely used in outdoor fairs and carnivals.

2 Overview of Wireless LANs WLANs gain great flexibility by the use of radio waves instead of wires to carry their communications. This freedom comes at a cost in network overhead and complexity however, as the radio medium is inherently less reliable and less secure than a wired network. 11 WLANs are able to transmit and receive at a variety of data rates and switch between them dynamically. They step down to a lower rate when transmission conditions are poor, and back up again when signal reception improves.

The overall changes of the roaming process do not introduce any new security vulnerabilities. This preserves the behavior of current stations and access points. 11r will govern the way roaming clients communicate with candidate APs for instance in establishing security associations and reserving QoS resources. 11r, clients can use the current AP as a passage to other APs, allowing clients to minimize disruptions caused by the roaming transition. 11 wireless LANs, the Mesh Networks, which supports frame delivery in a hop-by-hop fashion.

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