By Alan Holt
Wireless verbal exchange has the benefit of mobility and obviates the necessity for cabling, yet is inherently much less safe and is topic to the heavy rules 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 speedy speed, however the most generally accredited WLAN ordinary is the IEEE 802.11.
This special and hugely useful textual content introduces the foundations of WLANs dependent upon the IEEE 802.11 criteria, demonstrating how you can configure apparatus that allows you to enforce a variety of community suggestions. Readers will achieve realizing of the protection implications of instant networks and learn the way vulnerabilities should be mitigated. also, the publication examines the underlying 802.11 protocols and explains how you can construct mathematical types with a purpose to examine functionality in a WLAN environment.
Topics and Features:
- Presents a realistic method supported by means of the large use of examples and exact instructions
- Discusses a variety of instant community ideas throughout a couple of varied seller systems, together with Cisco Aironet, Alactel-Lucent Omniaccess and Meru Networks
- Provides quite a few mathematical types for studying the functionality of IEEE 802.11 criteria, and indicates tips on how to construct those versions utilizing Maple
- Examines problems with instant protection and describes how one can enforce a instant community with firm security
- Investigates the medium entry keep watch over sub-layer, and versions for functionality research of the MAC layer
- Reviews the actual sub-layers of 802.11, describing modulation recommendations and reading how units adapt to adjustments within the RF environment.
A hugely necessary text/reference for pros, undergraduate and graduate-level scholars also will locate this ebook an awesome significant other 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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Extra info for 802.11 Wireless Networks: Security and Analysis
The more deeply the receiver is located in the shadow, the greater the attenuation of the diffracted signal. 11) The parameter h is the height of the object above the direct line of the signal and d1 and d2 are the respective distances between the two devices and the obstacle (see Fig. 8). 1) The 3D surface graph in Fig. 9 shows the diffraction loss between two devices 1000 m apart. An object obstructs the direct signal path and is located 100 ≤ d1 ≤ 900 meters from one device (and d2 = 1000 − d1 meters from the other).
1 The Electromagnetic Spectrum Radio waves are a form of electromagnetic radiation. Electromagnetic radiation is energy radiated by a charged particle as a result of acceleration. James Clark Maxwell derived a mathematical framework based upon Faraday’s empirical data on magnetic lines of force. Maxwell’s equations describe how electromagnetic waves propagate. Electric and magnetic fields propagate as sinusoids at right angles to each other. 1 shows the direction of an electric field (E) and magnetic field (H ) relative to the direction of the wave propagation.
6. 4 GHz band but this is due to the effective aperture of the antenna rather than the frequency of the signal itself. > display(G1,G2); 22 2 Radio Frequencies Fig. 6 Free-space loss The free-space loss equation(s) discussed above are for isotropic antennas. Isotropic antennas, however, are merely theoretical and do not exist in practice. Actual antennas exhibit some form of directionality. The isotropic antenna is merely used as a reference point when comparing the gain from using real antennas.
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