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Chapter8

True/False
Indicate whether the statement is true or false.
 

 1. 
Wireless signals experience attenuation.
 

 2. 
Spread spectrum is a popular way of making wireless transmissions more secure.
 

 3. 
Wireless networks are laid out using the same topologies as wired networks.
 

 4. 
If a station detects the presence of several access points, it will always choose the closest access point.
 

 5. 
WiMAX is defined by the IEEE 802.11 standard.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 6. 
In wireless communication, to exchange information, two antennas must be tuned to the same ____.
a.
frequency
c.
attenuation speed
b.
variance
d.
port
 

 7. 
A directional antenna issues wireless signals along a(n) ____ direction.
a.
open
c.
wide
b.
narrow
d.
single
 

 8. 
In ____, a wireless signal splits into secondary waves when it encounters an obstruction.
a.
reflection
c.
diffraction
b.
scattering
d.
bounce back
 

 9. 
____ is a most significant problem for wireless communications because the atmosphere is saturated with electromagnetic waves.
a.
Attenuation
c.
Diffraction
b.
Fading
d.
Interference
 

 10. 
In ____ wireless systems, the result is a point-to-point link.
a.
mobile
c.
fixed
b.
variable
d.
open
 

 11. 
In ____ scanning, the station transmits a special frame, known as a probe, on all available channels within its frequency range.
a.
active
c.
fixed
b.
passive
d.
open
 

 12. 
A unique characteristic of the 802.11 data frame is its ____ field.
a.
Frame Control
c.
Data
b.
Sequence Control
d.
Duration
 

 13. 
The average geographic range for an 802.11a antenna is ____ meters.
a.
20
c.
330
b.
100
d.
600
 

 14. 
____ is the least popular WLAN standard.
a.
802.11a
c.
802.11g
b.
802.11b
d.
802.11n
 

 15. 
An 802.11g antenna has a geographic range of ____ meters.
a.
20
c.
300
b.
100
d.
330
 

 16. 
____ may use either the 2.4-GHz or 5-GHz frequency range.
a.
802.11a
c.
802.11g
b.
802.11b
d.
802.11n
 

 17. 
____ is an 802.11n feature that allows two adjacent 20-MHz channels to be combined to make a 40-MHz channel.
a.
Channel bonding
c.
Frame aggregation
b.
Channel aggregation
d.
Frame bonding
 

 18. 
____ is an 802.11n network feature allowing the combination of multiple frames into one larger frame.
a.
Channel bonding
c.
Frame aggregation
b.
Channel aggregation
d.
Frame bonding
 

 19. 
Using Bluetooth version 2.0, communicating nodes can be as far as ____ meters apart.
a.
30
c.
300
b.
100
d.
330
 

 20. 
____ is a command-line function for viewing and setting wireless interface parameters and it is common to nearly all versions of Linux and UNIX.
a.
ipconfig
c.
config
b.
iwconfig
d.
ivconfig
 

 21. 
If intermittent and difficult-to-diagnose wireless communication errors occur, ____ might be the culprit.
a.
incorrect encryption
c.
interference
b.
SSID mismatch
d.
incorrect antenna placement
 

 22. 
LEO satellites orbit the Earth with an altitude as low as ____ miles.
a.
100
c.
6,000
b.
1240
d.
22,300
 

 23. 
____ satellites are the type used by the most popular satellite Internet access service providers.
a.
Transponder
c.
Low Earth orbiting
b.
Medium Earth orbiting
d.
Geosynchronous orbiting
 

 24. 
Satellite Internet access providers typically use frequencies in the C- or ____ bands.
a.
L-
c.
Ku-
b.
S-
d.
Ka-
 

 25. 
Dial return satellite Internet access is a(n) ____ technology.
a.
symmetrical
c.
proprietary
b.
asymmetrical
d.
open source
 

 26. 
Satellite return Internet access is a(n) ____ technology.
a.
symmetrical
c.
proprietary
b.
asymmetrical
d.
open source
 



 
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