Download 802.11 Wireless Networks: The Definitive Guide (O'Reilly by Matthew Gast PDF

By Matthew Gast

It is a nice ebook for wireless procedure engineers to appreciate 802.11 a\b\g PHY and MAC. The e-book not just talks approximately theoretical stuff but in addition provides useful facets of wireless networking.

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Additional resources for 802.11 Wireless Networks: The Definitive Guide (O'Reilly Networking)

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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.

The last field inserted by SNAP is an organizationally unique identifier (OUI). Initially, the IEEE hoped that the 1-byte service access points would be adequate to handle the number of network protocols, but this proved to be an overly optimistic assessment of the state of the world. As a result, SNAP copies the type code from the original Ethernet frame. Products usually have a software option to toggle between the two encapsulation types. Of course, products on the same network must use the same type of encapsulation.

The PS-Poll frame contains an Association ID in the Duration/ID field so that the access point can determine which frames were buffered for the mobile station. However, the MAC specification requires all stations receiving a PS-Poll to update the NAV with an implied value equal to a short interframe space and one ACK. Although the NAV is too short for the data frame, the access point acquires that the medium and all stations defer access for the entire data frame. At the conclusion of the data frame, the NAV is updated to reflect the value in the header of the data frame.

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