New PDF release: 802.11 Wireless Networks: The Definitive Guide (2nd Edition)

By Matthew Gast

ISBN-10: 0596100523

ISBN-13: 9780596100520

As we know via now, instant networks provide many merits over fastened (or stressed out) networks. top-rated on that record is mobility, due to the fact going instant frees you from the tether of an Ethernet cable at a table. yet that's simply the end of the cable-free iceberg. instant networks also are extra versatile, speedier and more uncomplicated so you might use, and cheaper to installation and maintain.

The de facto typical for instant networking is the 802.11 protocol, which include wireless (the instant common referred to as 802.11b) and its quicker cousin, 802.11g. With easy-to-install 802.11 community to be had in every single place you switch, the alternative turns out basic, and plenty of humans dive into instant computing with much less inspiration and making plans than they'd provide to a stressed community. yet it's clever to be accustomed to either the services and hazards linked to the 802.11 protocols. And 802.11 instant Networks: The Definitive Guide, 2d variation is the precise position to start.

This up to date version covers every thing you'll ever want to know approximately instant know-how. Designed with the process administrator or severe domestic person in brain, it's a no-nonsense advisor for developing 802.11 on home windows and Linux. one of the wide selection of subject matters lined are discussions on:
* deployment issues
* community tracking and function tuning
* instant safety matters
* the way to use and choose entry issues
* community tracking necessities
* instant card configuration
* defense concerns specified to instant networks
With instant expertise, the benefits to its clients are certainly considerable. businesses now not need to care for the effort and cost of wiring constructions, and families with numerous pcs can stay away from fights over who's on-line. And now, with 802.11 instant Networks: The Definitive Guide, 2d variation, you could combine instant expertise into your present infrastructure with the maximum self assurance.

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Extra info for 802.11 Wireless Networks: The Definitive Guide (2nd Edition)

Example text

3 Extended service areas BSSs can create coverage in small offices and homes, but they cannot provide network coverage to larger areas. 11 allows wireless networks of arbitrarily large size to be created by linking BSSs into an extended service set (ESS). An ESS is created by chaining BSSs together with a backbone network. 11 does not specify a particular backbone technology; it requires only that the backbone provide a specified set of services. In Figure 2-5, the ESS is the union of the four BSSs (provided that all the access points are configured to be part of the same ESS).

Figure 2-1 shows the relationship between the various components of the 802 family and their place in the OSI model. Figure 2-1. The IEEE 802 family and its relation to the OSI model IEEE 802 specifications are focused on the two lowest layers of the OSI model because they incorporate both physical and data link components. All 802 networks have both a MAC and a Physical (PHY) component. The MAC is a set of rules to determine how to access the medium and send data, but the details of transmission and reception are left to the PHY.

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. 11 splits the PHY into two generic components: the Physical Layer Convergence Procedure (PLCP), to map the MAC frames onto the medium, and a Physical Medium Dependent (PMD) system to transmit those frames. The PLCP straddles the boundary of the MAC and physical layers, as shown in Figure 2-2. " Figure 2-2. PHY components All this complexity begs the question of how much you actually need to know.

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802.11 Wireless Networks: The Definitive Guide (2nd Edition) by Matthew Gast


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