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 less than the hood with trendy most up-to-date WLAN applied sciences, delivering sensible perception and context for deploying, coping with, and troubleshooting WLANs in any surroundings, from the company to the home.Covers all major IEEE 802.11 instant criteria: 802.11a, 802.11b, 802.11g, and 802.11i/WPAShows the best 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 consumer, 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

A great benefit to easing deployment of WLANs is that they operate in unlicensed spectrum, but this means that there is no way to prevent nearby "operators" of WLAN devices from interfering with each other. The limited range of WLAN devices helps prevent interference (best case is outdoors, with no line-of-sight obstructions, at 150 meters or so; indoors, usable WLANs rarely have a radius of more than 20 30 meters). 4 GHz range are becoming more widely available in PCs targeted at the home user, but luckily, PC cases are usually well-shielded against leakage of RF energy).

In each case, one of the attachments is drawn as a longer, thicker line, which represents a link from this LAN segment to an intermediate device; for example, a bridge or router (or, if you prefer, a layer-2 or layer-3 switch). Note that in either case, the topology can easily support delivery of broadcast frames (special frames that may be received by every station on the medium), which is one key property that distinguishes LANs from point-to-point or point-to-multipoint WAN-oriented Data Link protocols.

The LLC sub-layer protocol provides a form of demultiplexing for higher layer protocols via its two one-octet Destination and Source Service Access Point (DSAP and SSAP) fields. Due to the LLC sub-layer protocol's limited number of SAP values, there is another protocol in the LLC sub-layer known as the Subnetwork Access Protocol (SNAP), which has a full two-octet Type field and is layered on top of the LLC protocol. , 65,536) Type values, while setting the OUI to 0x000000 causes the Type field to be interpreted as if it were the Ethernet Type field.

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