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

By Thomas Maufer

During this booklet, 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 lower than the hood with cutting-edge most up-to-date WLAN applied sciences, providing sensible perception and context for deploying, dealing with, and troubleshooting WLANs in any setting, from the firm to the home.Covers all major IEEE 802.11 instant criteria: 802.11a, 802.11b, 802.11g, and 802.11i/WPAShows how one can set up small, mid-sized, huge, public, enterprise, and residential networksProvides pattern Windows(R), Linux(R), and MacOS(R) configurations that assist you start quicklyDemystifies WLAN defense 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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In all other ways, an Ethernet product that supports jumbo frames would be interoperable with earlier devices, but mixed networks might exhibit strange behavior, such as one-way traffic flows for large frames, and other bizarre effects. The only reason we mention these examples is that it is important to understand that there are no subtleties in the term de jure, but the meaning of the term de facto may be context-dependent, and it is possible to have a de facto usage of a de jure standard. [ Team LiB ] [ Team LiB ] The Mother of All Networking Standards The old ironic aphorism that the great thing about standards is that there are so many to choose from is funny because it is so true.

Figure 2-7 also places the Data Link layer in the context of the IETF's TCP/IP protocol stack. Figure 2-7. Data Link sub-layers relative to the OSI and TCP/IP models The Data Link layer's job, in its entirety, is to ensure that the bit-transmission facility (or facilities) of a particular physical medium appears error-free to the Network layer. For media that are shared among multiple stations, the Data Link layer also specifies procedures by which the stations fairly share access to the medium.

OSI Reference Model In most cases, a layer has well-defined interfaces that are used to either accept data from higher layers, or to indicate the presence of data to a higher layer. Typically, there are also control interfaces between the layers that allow a higher layer to configure a lower layer according to administrative preferences, operating conditions, and so forth. The internal operation of a layer is invisible to the layers above or below it; the important thing is that the layer must operate according to its configuration and support the functionality that is expected of it.

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