CWNA

Card Set Information

Author:
Tjr31
ID:
40254
Filename:
CWNA
Updated:
2010-10-06 16:46:55
Tags:
CWNA
Folders:

Description:
CH 5 and 6
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user Tjr31 on FreezingBlue Flashcards. What would you like to do?


  1. Frequency Hopping Spread Spectrum (FHSS)
    • transmitting radio signals by rapidly switching a carrier among frequency channels using a pseudorandom
    • sequence known to both the transmitter and the receiver

    data rate of 1 and 2 Mbps
  2. Direct Sequence Spread Spectrum (DSSS)
    • Data signal at the sending station is combined with a higher data rate bit sequence, or chipping code, that divides the user data according to a spreading ratio.
    • data rate of 1 and 2 Mbps
  3. Orthogonal Frequency Division Multiplexing (OFDM)
    transmits multiple signals simultaneously over a single transmission path, such a cable or wireless system

    • signal travels within its own unique frequency range (carrier), which is modulated by the data (text,
    • voice, video, etc)

    data rate of 6, 9, 12, 18, 24, 36, and 54 Mbps
  4. HR DSSS
    the 802.11b 5.5 and 11 mbps speeds
  5. ERP extended rate physical
    • physical layer specification defined for clause 19 radios.
    • operates at 2.4 ghz ism band
  6. ERP OFDM
    data rates of 6 - 54Mbps
  7. PHY (DSSS and FHSS require and support data
    rates of
    1 and 2 Mbps.
  8. OFDM and ERP-OFDM support data rates of
    1- of 6, 9, 12, 18, 24, 36, 48, and 54 Mbps, but only 6, 12, and 24 Mbps are mandatory)
  9. data rates
    number of bits/ second the physical layer carries during a single frame transmission
  10. throughput
    measurement of the amout of user data that successfully transverses the network over a period of time
  11. PHY frequency band
    . DSSS, FHSS, HR-DSSS, and ERP
  12. ODFM frequency bands
    5 GHz UNII bands
  13. DSSS, FHSS, HR-DSSS, and ERP frequency bands
    2.4 ghz ISM band
  14. three operational modes of ERP
    • b only
    • g only
    • b/g mixed
    • support different spread spectrum technologies and have different aggregae throughput reults
  15. Transmit Power Control TPC
    802.11h admendment, regulate power levels in .11a erc and fcc mandate radio at 5Ghz,
  16. 802.11i security
    RSN (Robust Security Network). 802.11i makes use of the Advanced Encryption Standard (AES) block cipher, whereas WEP and WPA
  17. 802.11e
    • Defines Quality of Service (QoS) mode of operation
    • Defines enhanced medium access methods
    • Uses Hybrid Coordination Function (HCF
  18. 802.11s
    • Adaptive configuration support
    • Standardization of Mesh Networking
    • Uses the MAC and PHY layers of 802.11
    • Specifies the DS be Wired
  19. 802.11.n
  20. Uses High Throughput Orthogonal Division
    • Multiplexing (HT-OFDM)
    • Uses MIMO
    • Uses Channel Bonding
    • Works in both 2.4 GHz and 5 GHz bands
  21. 802.11.p
    • 802.11 that support Intelligent
    • Transportation Systems (ITS)
    • Also known as Wireless Access in Vehicular
    • Environments (WAVE)
    • Can reach speeds up to 124 MPH/200KPH at 3281
    • feet/1000 Meters
    • Will possibly be licensed in the 5.9 GHz band
    • but supports 5 GHz bands
  22. 802.11w
    • Uses Protected Management Frames
    • Forces mutual authentication prior to deauthentication and disassociation
    • Reduces simple denial of service attacks
  23. Industrial, Scientific, and Medical bands (ISM)
    • •900 MHz
    • •2.4 GHz
    • •5.8 GHz
  24. Narrowband
    signals transmitted using higher power, and very little bandwidth
  25. Spread Spectrum
    • uses more bandwidth for transmission and less
    • power
  26. how coding and modulation of OFDM
    OFDM uses Binary Phase Shift Keying (BPSK) and Quadrature Phase Shift Keying (QPSK) modulation for lower data rates

    •QAM (Quadrarture Amplitude Modulation) is a hybrid of phase and amplitude modulation
  27. dwell time
    amout of time that the FHSS system transmits on a specific frequency befor it switches to the next frequency in the hop set
  28. hop time
    the amount of time it takes for the transmitter to change from one frequency to another
  29. delay spread
    dely between the reception of the main signal and the reflected signal
  30. ISM Industrial, Scientific,
    and Medical bands (ISM)
    • Not being used by 802.11 devices
    • Legacy wireless networking
  31. Differential Binary Phase
    Shift Keying (DBPSK) modulation cna coding
    • 1 Mbps
    • modulation for lower data rates
  32. Differential Quadrature
    Phase Shift Keying (DQPSK) modulation and coding
    • at 2, 5.5 and 11 Mbps
    • modulation for lower data rates
  33. Complementary Code Keying
    • 4 bits of data with 8 chips (5.5 Mbps) and
    • can encode 8 bits of data with 8 chips (11 Mbps)
  34. Barker Codes
    • Let the code to be transmitted is 10
    • •11111111111 00000000000 XOR
    • 10110111000 10110111000
    • 01001000111 10110111000
  35. QAM (Quadrarture
    Amplitude Modulation)
    is a hybrid of phase and amplitude modulation

    16-QAM and 64-QAM is used for higher data rates
  36. 900 MHz ISM Band
    26 MHz wide

    •Includes 902 MHz to 928 MHz

    •Legacy wireless networking

    • •Partially allocated for Global System Mobile
    • Communications (GSM Cellular) in parts of the world

    •Used by cell phones

    •Not being used by 802.11 devices
  37. 2.4 GHz ISM Band
    • 83.5 MHz Wide
    • Covers 2.4 GHz to 2.4835 GHz
    • USA has 11 channels, each of 22MHz wide
    • Channels 1,6 and 11 are most widely used because they don’t overlap
    • Used by 802.11, 802.11b, g and n IEEE standards
    • 2.4 GHz ranges uses DSSS modulation
    • Also widely used by non-networking devices (microwaves, baby monitors, etc.)
    • Devices transmitting on Adjacent Overlapping Channels cause Interference for each other.
    • Channels 1, 6 and 11 are
    • Adjacent Non-Overlapping Channels.
    • That is why they are used so often in
    • co-location of 802.11 devices
  38. 5.8 GHz ISM Band
    • 150 MHz Wide
    • Includes 5.725 GHz to 5.875 GHz
    • Divided into channels, each 20 MHz wide
    • Total of 23 non-overlapping channels
    • Used by many non-networking devices
    • Should not be confused with UNII-3 Bands
    • 5.81 ISM band is 50 MHz larger than UNII-3
    • Used by 802.11a standard and the new 802.11n draft Uses OFDM
    • Data rates of 6, 9, 12, 18, 24, 36, 48, and 54 Mbps are defined
  39. Unlicensed National
    Information Infrastructure (UNII) Bands
    Contains Three 5 GHz Bands

    • Defined as Lower, Middle, and Upper UNII
    • Bands (aka UNII 1, UNII 2, and UNII 3)

    • In the United States, The FCC opened more
    • channels for UNII 2. Now UNII 2 Extended
    • offers 11 more channels for use, with some restrictions.
  40. UNII 1
    (The Lower UNII Band)
    • Has 4 Channels
    • Includes 5.15 GHz to 5.25 GHz
    • Typically Used Indoors
    • Allowed a Maximum IR of 50 mW by
    • the FCC
    • Most Vendors Limit the IR to 40 mW
    • Prior to 2004 UNII 1 Devices Were Required to
    • use Fixed Antennae
    • After 2004, Detachable Antennae may be used
    • Within Regulatory Body Guidelines
  41. UNII 2
    (The Middle UNII Band
    • Has 4 Channels
    • Includes 5.25 GHz to 5.35 GHz
    • IEEE Maximum 200 mW IR
    • FCC Maximum 250 mW IR
    • Power limits may vary by country
  42. UNII 2 Extended
    • Has 11 Channels
    • FCC added 255 MHz of Spectrum to within 5.47
    • GHz to 5.725 GHz
    • Maximum Allowed IR Strength 250 mW
    • IEEE Maximum IR Strength 200 mW
    • Requires Dynamic Frequency Selection (DFS)
    • Requires Transmit Power Control (TPC)
  43. UNII 3
    (The Upper UNII Band)
    • Has 4 Channels
    • Includes 5.725 GHz to 5.825 GHz
    • FCC maximum power 1000 mW
    • IEEE maximum power 800 mW
    • Shares starting frequency with the 5.8 GHz
    • ISM Band
    • UNII 3 is 100 MHz wide while the 5.8 GHz ISM
    • Band is 150 mW wide

What would you like to do?

Home > Flashcards > Print Preview