Download 802.11 Wireless Networks: The Definitive Guide, Second by Matthew S. Gast PDF

By Matthew S. Gast

It is a nice publication for wireless approach engineers to appreciate 802.11 a\b\g PHY and MAC. The publication not just talks approximately theoretical stuff but additionally provides sensible features of wireless networking.

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Additional info for 802.11 Wireless Networks: The Definitive Guide, Second Edition

Sample text

Disassociation To terminate an existing association, stations may use the disassociation service. When stations invoke the disassociation service, any mobility data stored in the distribution system is removed. Once disassociation is complete, it is as if the station is no longer attached to the network. Disassociation is a polite task to do during the station shutdown process. The MAC is, however, designed to accommodate stations that leave the network without formally disassociating. Authentication Physical security is a major component of a wired LAN security solution.

11a were released as the first edition of this book was completed. 11g is the newest physical layer on the block. 11b. Backwards compatibility is not without a price, though. 11g users. 11 is exciting precisely because of these details. 11 allows for mobile network access; in accomplishing this goal, a number of additional features were incorporated into the MAC. 11 MAC may seem baroquely complex compared to other IEEE 802 MAC specifications. The use of radio waves as a physical layer requires a relatively complex PHY, as well.

Only three of the services are used for moving data; the remaining six are management operations that allow the network to keep track of the mobile nodes and deliver frames accordingly. The services are described in the following list and summarized in Table 2-1: Distribution This service is used by mobile stations in an infrastructure network every time they send data. Once a frame has been accepted by an access point, it uses the distribution service to deliver the frame to its destination. Any communication that uses an access point travels through the distribution service, including communications between two mobile stations associated with the same access point.

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