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802.11 MAC Layer Defined   By 80211-planet.com
By Jim Geier The 802.11 standard specifies a common medium access control MAC Layer which provides a variety of functions that support the operation of 802.11-based wireless LANs. In general the MAC Layer manages and maintains communications between 802.11 stations radio network cards and access points by coordinating access to a shared radio...

802.11 Security Beyond WEP   By 80211-planet.com
By Jim Geier As discussed in a previous tutorial 802.11 wired equivalent privacy WEP has weaknesses making it inadequate for protecting networks containing sensitive information. WEP does a fairly good job of defending against the general public but there are some good hackers lurking out there who can crack into a WEP-protected network. As a...

by Matthew Gast author of 802.11 Wireless Networks The Definitive Guide 05 24 2002 Before you uncrate one piece of network equipment for a mass deployment you need to have the right design in place. Good network design is often the difference between a successful rollout and a torrent of user complaints. Many organizations are now considering deployment...

802.11 Alphabet Soup   By 80211-planet.com
By Jim Geier In June 1997 the Institute of Electrical and Electronic Engineers IEEE finalized the initial standard for wireless LANs IEEE 802.11. This standard specified a 2.4GHz operating frequency with data rates of 1 and 2Mbps. When deploying a wireless LAN using the initial version of 802.11 you could opt for using frequency hopping spread...

Understanding 802.11 Frame Types   By 80211-planet.com
By Jim Geier When analyzing or troubleshooting the operation of a wireless LAN you ll likely be using an 802.11 packet analyzer e.g. AiroPeek or Sniffer Wireless to monitor the communications between radio network interface cards NICs and access points. After capturing the packets you need to understand the different 802.11 frame types as a...

802.11 Task Group Update   By oreillynet.com
by Glenn Fleishman 04 05 2002 An alphabet soup of standards is about to overflow the boundaries of committee meetings and fill in the cracks in wireless networking. The IEEE 802.11 Working Group has been busy over the past year moving several lettered task groups closer to ratification of standards for speed scheduling security frequency coexistence...

802.11 Data Frames Revealed   By wi-fiplanet.com
By Jim Geier Wireless LANs perform many functions but the main idea is to move information from one point to another over an air medium. There are lots of networking protocols and physics that come into play to make this happen but 802.11 data frames are responsible for getting the job done. Data Frame Basics An 802.11 data frame consists of a frame...

EIRP Limitations for 802.11 WLANs   By 80211-planet.com
By Jim Geier The spectrum regulatory body of each country restricts signal power levels of various frequencies to accommodate needs of users and avoid RF interference . Most countries deem 802.11 wireless LANs as license free. In order to qualify for license free operation however the radio devices must limit power levels to relatively low values....

By Jim Geier Wireless LANs certainly provide the freedom of mobility as we use our laptops and PDAs without the constraints of network cabling. Of course to facilitate this benefit we unplug our devices from AC power and operate them from batteries. As most of know however 802.11 network cards consume significant amounts of energy that drains batteries...

By Jim Geier The security of a wireless LAN is very important especially for applications hosting valuable information. For example networks transmitting credit card numbers for verification or storing sensitive information are definitely candidates for emphasizing security. In these cases and others proactively safeguard your network against security...

Troubleshooting Your 802.11 WLAN   By 80211-planet.com
By Jim Geier Last month we discussed how RF interference hinders the installation of wireless LANs and we covered the use of site survey tools that help with deployments. Once you have the network installed everything should continue to operate without any problems right Don t count on it Unforeseen problems can drive you crazy Chances are that...

Minimizing 802.11 Interference Issues   By 80211-planet.com
By Jim Geier RF interference is still plaguing wireless LAN deployments. Many companies have gotten by without any problems but some have installations that don t operate as well as planned. The perils of interfering signals from external RF sources are often the culprit. As a result it s important that you re fully aware of RF interference impact...

By Jim Geier Wireless LAN installation is tricky. Unlike wired networks you can t visualize the wireless medium. The construction of a facility and silent sources of RF interference impact the propagation of radio waves often in odd ways. This hinders your ability to plan the location of access points. How do you avoid these drawbacks Perform an...

By Jim Geier With 802.11 s optional WEP Wired Equivalent Privacy all access points and client radio NICs on a particular wireless LAN must use the same encryption key. Each sending station encrypts the body of each frame with a WEP key before transmission and the receiving station decrypts it using an identical key upon reception. This process reduces...

by Matthew Gast author of 802.11 Wireless Networks The Definitive Guide 10 17 2002 Related Reading 802.11 Wireless Networks The Definitive Guide Creating and Administering Wireless Networks By Matthew Gast Table of Contents Index Sample Chapter Read Online--Safari Broadly speaking wireless LAN security has two major issues. Authentication of network...

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