Download A Field Guide to Wireless LANs for Administrators and Power by Thomas Maufer PDF
By Thomas Maufer
During this ebook, best-selling networking writer Thomas Maufer explains how instant LANs paintings, and the way to lead them to paintings for you-reliably and securely. Maufer takes you below the hood with modern-day most recent WLAN applied sciences, delivering useful perception and context for deploying, coping with, and troubleshooting WLANs in any surroundings, from the company to the home.Covers all top IEEE 802.11 instant criteria: 802.11a, 802.11b, 802.11g, and 802.11i/WPAShows the way to install small, mid-sized, huge, public, enterprise, and residential networksProvides pattern Windows(R), Linux(R), and MacOS(R) configurations that assist you start quicklyDemystifies WLAN safety so that you can know the way to guard your dataIlluminates the 802.11 protocol so that you can troubleshoot extra effectivelyPreviews tomorrow's WLAN criteria and purposes for enterprise and residential (IEEE 802.11j and 802.11n)Whether you are a network/system administrator or an influence person, Thomas Maufer demystifies instant LAN technology... so that you can maximize the advantages whereas minimizing the hassles.
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Additional resources for A Field Guide to Wireless LANs for Administrators and Power Users
Example text
4 GHz and one for 5 GHz. " A dual-band wireless STA will presumably always associate with the fastest AP available, unless the signal quality from that AP would not result in a good-quality connection. Such decisions are out of the scope of the standard, and are an implementation choice for the vendor of the dual-band device. 11 is that (in general) higher speed modulations have shorter range. 11b might in theory be able to service a circular area[5] that is 300 feet (90 100 meters) in radius, but the closer a STA is to an AP, the stronger the signal will be, and the more successful the STA will be in using a higher-speed modulation.
FHSS technology has been widely deployed in the context of other wireless communication systems, and there is a large installed base of FHSS-based systems deployed today. However, the frequency hopping variety of spread spectrum is effectively a dead-end technology insofar as WLANs are concerned. The Direct Sequence Spread Spectrum (DSSS) techniques covered in this chapter are scalable to much higher throughput rates. This sidebar gives a "just the facts"-level of coverage of FHSS. 4 GHz band in a completely different way than the Barker code, which is a form of Direct Sequence Spread Spectrum (DSSS) that also achieves 1 or 2 Mbps, using either 2GFSK (two-level Gaussian Frequency Shift Keying) or 4GFSK (four-level GFSK) coding, respectively.
Layered protocol model 32 33 The "transmit" direction is down the stack, and the "receive" direction is up the stack. Each layer is communicating with a peer process at the same layer on another machine, using the services provided by the layers below it in the stack. Logically, the interaction is as if the peers were communicating directly, a fiction that is achieved through the presence of the lower layers. Figure 2-3 shows the logical (horizontal) and physical (vertical) operation of the layered protocol model.