By Alan Holt
Wireless conversation has the good thing about mobility and obviates the necessity for cabling, yet is inherently much less safe and is topic to the heavy legislation of the radio frequency spectrum. however, the allocation of unlicensed components of the spectrum has facilitated the expansion in instant neighborhood zone networks (WLANs). WLAN know-how is progressing at a quick velocity, however the most generally authorized WLAN ordinary is the IEEE 802.11.
This specific and hugely useful textual content introduces the rules of WLANs dependent upon the IEEE 802.11 criteria, demonstrating how you can configure gear which will enforce a number of community recommendations. Readers will achieve realizing of the protection implications of instant networks and learn the way vulnerabilities will be mitigated. also, the booklet examines the underlying 802.11 protocols and explains tips to construct mathematical versions with the intention to examine functionality in a WLAN environment.
Topics and Features:
- Presents a realistic method supported through the broad use of examples and exact instructions
- Discusses quite a few instant community suggestions throughout a few assorted seller structures, together with Cisco Aironet, Alactel-Lucent Omniaccess and Meru Networks
- Provides a number of mathematical versions for reading the functionality of IEEE 802.11 criteria, and exhibits the best way to construct those versions utilizing Maple
- Examines problems with instant safety and describes tips on how to enforce a instant community with company security
- Investigates the medium entry keep an eye on sub-layer, and types for functionality research of the MAC layer
- Reviews the actual sub-layers of 802.11, describing modulation recommendations and studying how units adapt to alterations within the RF environment.
A hugely important text/reference for pros, undergraduate and graduate-level scholars also will locate this booklet an awesome better half to a school path on instant networking.
Dr. Alan Holt is leader Technical Officer on the community consultancy corporation IP functionality Ltd., established in Bristol, united kingdom. he's writer of the preferred Springer textual content Network functionality research: utilizing the J Programming Language.
Dr. Chi-Yu Huang works for Tata applied sciences Ltd., and is presently a software program advisor at the Airbus undertaking in Bristol. She used to be previously Operations supervisor for DL Consulting, New Zealand.
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Additional resources for 802.11 Wireless Networks: Security and Analysis
1) Once the RTS/CTS exchange has been successfully completed, data and ACK frames are sent in the same way as the basic access method. 3 Inter-frame Spacing Devices must wait for a period called an inter-frame space (IFS) before transmitting a frame. 11 MAC implements frame prioritisation using IFS intervals of different lengths. The IFS times, defined in the (original) standard, are: • Short IFS (SIFS). 42 3 Medium Access Control • PCF IFS (PIFS). • DCF IFS (DIFS). • Extended IFS (EIFS). The IFSes above are listed in order of priority; thus: SIFS < PIFS < DIFS < EIFS.
Like BTMA, SRMA uses a data channel for transmitting data and a separate control channel for exchanging handshakes. Multiple access collision avoidance (MACA)  was the first CSMA/CA-like protocol. It uses an RTS/CTS mechanism influenced by the Appletalk protocol. The transmission of a data frame is preceded by a ready-to-send (RTS) and a clear-tosend (CTS) exchange between the sender and receiver. Unlike SRMA, RTS and CTS frames are sent over the same channel as data frames. The surrounding neighbours in range of the RTS or CTS frames defer any pending transmissions.
Power mgmt: If the sending device is in power save mode, this bit is set to 1 (and 0 otherwise). Fig. 4 MAC header Fig. 3 Distributed Coordination Function 39 • More data: When a device is in power save mode, the access-point can buffer the frames destined for it. This bit is set to 1 to indicate that the access-point has one or more frames for a sleeping device. • WEP: This field is set to 1 to indicate that WEP was used to encrypt the frame body. • Other: Set to 1 if strict ordering is enabled.