By Matthew Gast
It is a nice ebook for wireless approach engineers to appreciate 802.11 a\b\g PHY and MAC. The e-book not just talks approximately theoretical stuff but additionally offers useful facets of wireless networking.
Read Online or Download 802.11 Wireless Networks: The Definitive Guide (O'Reilly Networking) PDF
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Extra resources for 802.11 Wireless Networks: The Definitive Guide (O'Reilly Networking)
Multiframe sequences may update the NAV with each step in the transmission procedure. When a station receives a medium reservation that is longer than the current NAV, it updates the NAV. Setting the NAV is done on a frame-by-frame basis and is discussed in much more detail in the next chapter. 3. The following types of frames can be transmitted after the SIFS and thus receive maximum priority: acknowledgments, the CTS in an RTS/CTS exchange sequence, and fragments in fragment sequences. a. Once a station has transmitted the first frame in a sequence, it has gained control of the channel.
Figure 3-20. 2 Deferred response Instead of an immediate response, access points can also respond with a simple acknowledgment. This is called a deferred response because the access point acknowledges the request for the buffered frame but does not act on it immediately. A station requesting a frame with a PS-Poll must stay awake until it is delivered. Under contention-based service, however, the access point can deliver a frame at any point. A station cannot return to a low-power mode until it receives a Beacon frame in which its bit in the traffic indication map (TIM) is clear.
11 has been widely and rapidly adopted, security issues have continued to grab headlines. Network managers will undoubtedly be asked to comment on security issues, especially in any wireless LAN proposals. To understand and participate in these discussions, read Chapter 5. 1x. 1x, which is described in Chapter 6. 1x has reportedly been broken. • Troubleshooting wireless networks is similar to troubleshooting wired networks but can be much more complex. As always, a trusty packet sniffer can be an invaluable aid.