Implementing Cisco Unified Wireless Networking Essentials (IUWNE)
  • Wireless Fundamentals
    • Amplitude is the name of the distance between the higher crest of a wave and the lower crest.
    • 1 kHz is the frequency of a signal that occurs 1,000 times per second.
    • Scattering term describes the spreading of a signal in multiple directions by small particles.
    • SNR term describes the amount by which a signal is better than the noise level.
    • For a signal to be good, the RSSI level must be as high as the SNR level.
    • WMAN is type of wireless network which covers an area the size of a city.
    • WLAN is type of wireless network which extends LANs.
    • Repeater device can be used to extend the range of an AP.
    • Wireless coverage area of an AP is a BSA.
    • System in which a wired network links two APs is an ESS.
    • EIRP does not relate only to omnidirectional antennae.
    • 200 mW is equivalent to 23 dBm.
    • Effective Isotropic Radiated Power is EIRP.
    • There is no direct conversion between dBm and dBi.
    • Side view of the antenna radiation pattern describes an elevation chart.
    • The magnetic field oriented in comparison to the electric field is 90 degrees to the left.
    • Multiple antennas is used to try to solve multi-path issues.
    • RP-TNC connector is used on Cisco APs.
    • The radiated signal is weaker is one disadvantage of using a splitter.
    • Narrows the vertical beam is the effect of increasing the gain of an omnidirectional antenna.
    • 5.5 Mb/s rate is a DSSS speed.
    • Barker 11 transform each bit of the data into an 11-bit chip that is to be sent.
    • DSSS use sending a wide signal spread of 22 MHz method to combat interference.
    • OFDM uses small carriers instead of a large one of DSSS.
    • An AP sends a special beacon with duration set to 32768 start DCF mode.
    • CSMA/CA layer 2 technique is used in wireless networks.
    • A client must wait duration of client NAV before being able to send a frame in the normal operation of a cell.
    • An 802.11 header contains a maximum of four MAC addresses.
    • RA is address of the station to receive the frame.
    • A wireless ACK sent after each data frame.
    • The control field gives information about frame type.
    • The SSID usually found in beacon and authentication requests frames.
    • 802.15.1 IEEE protocol relates to Bluetooth.
    • Network coordinator device in a ZigBee network sends beacons.
    • 5 miles is the range of 802.16e.
    • Create regulations is the role of the FCC.
    • 20 dBm is the maximum EIRP in the 2.4-GHz band, per ETSI rules.
    • 19 non-overlapping 802.11a channels are available in Europe.
    • 11 Mb/s rate is an 802.11b speed.
    • MIMO is new wireless modulation and technique that is used to gain longer range and higher speed.
    • 4 non-overlapping 802.11b/g channels are available in Europe.
    B-)