OMIS 660 Final Exam UPDATED Questions and CORRECT Answers
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Course
OMIS 660
Institution
OMIS 660
OMIS 660 Final Exam UPDATED
Questions and CORRECT Answers
The golden Zone in commercial mobile radio transmission is the high megahertz to low
gigahertz range - CORRECT ANSWER- What is the Golden zone in commercial mobile
radio transmission?
Unlicensed - CORRECT ANSWER- Do WLANs today use li...
OMIS 660 Final Exam UPDATED
Questions and CORRECT Answers
The golden Zone in commercial mobile radio transmission is the high megahertz to low
gigahertz range - CORRECT ANSWER✔✔- What is the Golden zone in commercial mobile
radio transmission?
Unlicensed - CORRECT ANSWER✔✔- Do WLANs today use licensed or unlicensed
bands?
Users of unlicensed radio bands must tolerate interference from others - CORRECT
ANSWER✔✔- What are the disadvantages of unlicensed bands
2.4 and 5GHZ - CORRECT ANSWER✔✔- In what two unlicensed bands does 802.11
operate
3 - CORRECT ANSWER✔✔- How many non-overlapping channels does the 2.4 GHz band
support
20MHZ - CORRECT ANSWER✔✔- How wide are 802.11 channels usually
Between 11 - 24 - CORRECT ANSWER✔✔- How many nonoverlapping channels does the
5 GHz band support
Spread spectrum transmission - CORRECT ANSWER✔✔- In unlicensed bands what type of
transmission method is required by regulators
Frequency hopping spread spectrum - CORRECT ANSWER✔✔- What do the following
stand for:FSSS
Direct sequence spread spectrum - CORRECT ANSWER✔✔- What do the following stand
for:DSSS:
, Othogonal frequency division multiplexing - CORRECT ANSWER✔✔- What do the
following stand for:OFDM :
OFDM - CORRECT ANSWER✔✔- What spread spectrum transmission method is used in
54 Mbps 802.11g WLANs
If two devices transmit at the same time, their signals will collide, becoming unreadableThe
access point and all of the wireless hosts transmit and receive in a single channel - meaning
that only one transmit at a time and the other devices must wait - CORRECT ANSWER✔✔-
When there is an access point and several wireless hosts, why may only one device transmit
at a time?
bridge - CORRECT ANSWER✔✔- Is a wireless access point a bridge or a router
Carrier sense multiple access with collision avoidance (CSMA/CA) - CORRECT
ANSWER✔✔- What does CsMA/CA + ACK stand for?
Acknowledgement frame (ACK). - CORRECT ANSWER✔✔- What is the purpose of the
ACK
a-54Mbps, b-11Mbps g-54Mbps n-100mbps to 300mbps - CORRECT ANSWER✔✔- What
are the rated speads for 802.11a, b, g, n?
20 n 40 MHZ. - CORRECT ANSWER✔✔- For what radio band or bands does the 802.11n
standard work
802.11b - CORRECT ANSWER✔✔- What was the first widely used 802.11 LAN standard ?
Fake access point - CORRECT ANSWER✔✔- What is an evil twin access point?
WEP: Wired equivalent privacy - CORRECT ANSWER✔✔- When 802.11 were created
what security protocol did it offer?
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