A Field Guide to Wireless LANs for Administrators and Power by Thomas Maufer

By Thomas Maufer

During this publication, best-selling networking writer Thomas Maufer explains how instant LANs paintings, and the way to cause them to paintings for you-reliably and securely. Maufer takes you less than the hood with brand new most up-to-date WLAN applied sciences, supplying 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 how you can 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 how to guard your dataIlluminates the 802.11 protocol so that you can troubleshoot extra effectivelyPreviews tomorrow's WLAN criteria and functions for company 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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The bit encoding on a Physical medium may include support for Forward Error Correction (if the medium is expected to be noisy). The Physical layer is fundamentally connection-oriented, since if a device is not connected (in some sense) it cannot send or receive bits. There may even be Physical layer headers that are transmitted ahead of a frame that describe the modulation or other aspects of the succeeding frame. 11, such a PHY protocol exists that allows different stations in a wireless LAN to operate at varying speeds.

11 only specifies a MAC sub-layer protocol. 3 standard specifies two versions of Ethernet, wherein one variety interprets the two-octet field following the MAC-SA field as a "Type", and the other variety of the Ethernet header interprets this two-octet field as a "Length" value, which pushes the higher-layer protocol demultiplexing tasks up to the LLC sub-layer. " 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.

The Physical layer is fundamentally connection-oriented, since if a device is not connected (in some sense) it cannot send or receive bits. There may even be Physical layer headers that are transmitted ahead of a frame that describe the modulation or other aspects of the succeeding frame. 11, such a PHY protocol exists that allows different stations in a wireless LAN to operate at varying speeds. The Data Link Layer Early Data Link protocols tended to be reliable, since early physical data communications media were so error-prone.

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