wireless networking

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  1. Networks that trans-mit signals through the atmosphere via radio frequency (RF) waves
    wireless networks
  2. continuum of the electromagnetic waves used for data and voice communication.
    wireless spectrum
  3. collection of frequencies available for communication
  4. describes the relative strength over a three dimensional area of all the electromagnetic energy the antenna sends or receives.
    antenna’s radiation pattern
  5. issues wireless signals along a single direction
    directional antenna
  6. issues and receives wireless signals with
    equal strength and clarity in all directions
    omnidirectional antenna
  7. uses the leastamount of energy and results in the reception of the clearest possible signal
    LOS (line-of-sight)
  8. in wireless signaling is no different from reflection of other electromagnetic waves,such as light.
  9. a wireless signal splits into secondary waves when it encounters an obstruction.
  10. the diffusion, or the reflection in multiple different directions, of a signal. Scattering occurs when a wireless signal encounters an object that has small dimensions compared to the signal’s wavelength.
  11. multiple number of differentpaths to their destination
  12. paths wireless signals take, they are bound to run into obstacles
    Signal Degradation
  13. a transmitter concentrates the signal energy at a singlefrequency or in a very small range of frequencies
  14. uses a relatively wide band of the wireless spectrum
  15. The use of multiple frequencies to transmit a signa
  16. a signal jumps between several different frequencies within a band in a synchronization pattern known only to the channel’s receiver and transmitter.
    frequency hopping spread spectrum
  17. a signals bits are distributed over an entire frequency band at once.
    direct-sequence spread spectrum
  18. wireless communication falls into one of two categories:
    • fixed
    • mobile
  19. wireless systems, the locations of the transmitter and receiver do not move.
  20. the receiver can be located anywhere within the
    transmitters range.
  21. a device that accepts wireless signals from multiple nodes and retransmits them to the rest of the network
    access point (AP)
  22. task
  23. In active scanning, the station transmits a special frame
  24. In passive scanning, a wireless station listens on all channels within its frequency range for aspecial signa
    beacon frame
  25. a unique character string used to identify an access point.
    service set identi-fier
Card Set
wireless networking
wireless networking
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