New PDF release: 802.11 Wireless Networks: The Definitive Guide, Second

By Matthew S. Gast

ISBN-10: 0596100523

ISBN-13: 9780596100520

It is a nice ebook for wireless process engineers to appreciate 802.11 a\b\g PHY and MAC. The publication not just talks approximately theoretical stuff but additionally supplies sensible facets of wireless networking.

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Additional info for 802.11 Wireless Networks: The Definitive Guide, Second Edition

Sample text

11 is superficially similar to Ethernet. 11 adapts traditional Ethernet technology to a wireless world. 11, a number of additional management features were added. 11 is a white lie about the meaning of media access control (MAC). Wireless network interface cards are assigned 48-bit MAC addresses, and, for all practical purposes, they look like Ethernet network interface cards. 11 cards have unique addresses even when deployed into a network with wired Ethernet stations. 11 MAC addresses go into ARP tables alongside Ethernet addresses, use the same set of vendor prefixes, and are otherwise indistinguishable from Ethernet addresses.

11 station uses the same method to gain access to the medium. 11 and Ethernet stem from the differences in the underlying medium. This chapter provides some insight into the motivations of the MAC designers by describing some challenges they needed to overcome and describes the rules used for access to the medium, as well as the basic frame structure. 11 network, skip ahead to the end of this chapter. 11 standard; detailed MAC state diagrams are in Annex C. Challenges for the MAC Differences between the wireless network environment and the traditional wired environment create challenges for network protocol designers.

When users connect to the network, they are attached to the same VLAN everywhere; the switched network simply requires that the wireless LAN device tag frames appropriately. Some products support the Mobile IP standard, or use VPN technology creatively. Trade-offs between all the different mobility strategies are discussed in Chapter 21. In practice, ESS transitions are quite rare. They usually only occur when users leave one administrative domain for another (say, the corporate network for a hot spot), in which case the two networks in question would have different IP addresses and no trust relationship to transparently attach a client without interrupting network-layer connectivity.

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802.11 Wireless Networks: The Definitive Guide, Second Edition by Matthew S. Gast


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