Chapter 8 Quiz Flashcards
WiMAX is defined by the IEEE 802.11 standard. T/F
False
____ satellites are the type used by the most popular satellite data service providers.
Geosynchronous earth orbiting
____ is an 802.11n feature that allows two adjacent 20-MHz channels to be combined to make a 40-MHz channel.
Channel bonding
If intermittent and difficult-to-diagnose wireless communication errors occur, ____ might be the culprit.
interference
An 802.11g antenna has a geographic range of ____ meters.
100
To establish a satellite Internet connection, each subscriber must have a ____.
dish antenna
Which satellites transmit and receive signals in the 12 to 18 GHz band?
Ku-
____ is a command-line function for viewing and setting wireless interface parameters and it is common to nearly all versions of Linux and UNIX.
iwconfig
In the case of connecting two WLANs, access points could be as far as ____ feet apart.
1000
Clients are able to exchange signals with satellites as long as they have a ____ path.
line-of-sight
The average geographic range for an 802.11a antenna is ____ meters.
20
Wireless signals experience attenuation. T/F
True
An ad hoc arrangement would work well for a WLAN with many users. T/F
False
Wireless networks are laid out using the same topologies as wired networks. T/F
False
In ____, a wireless signal splits into secondary waves when it encounters an obstruction.
diffraction
In __ wireless systems, the transmitting antenna focuses its energy directly toward the receiving antenna which results in a point-to-point link.
Fixed
__ is a significant problem for wireless communications because the atmosphere is saturated with electromagnetic waves.
Interference
A directional antenna issues wireless signals along a(n) __ direction.
Single
In wireless communication, to exchange information, two antennas must be tuned to the same __.
Frequency
In ____ wireless systems, the transmitting antenna focuses its energy directly toward the receiving antenna which results in a point-to-point link.
fixed
In ____ scanning, the station transmits a special frame, known as a probe, on all available channels within its frequency range.
active
A unique characteristic of the 802.11 data frame is its ____ field.
Sequence Control
____ is the least popular WLAN standard.
802.11a
Spread spectrum is a popular way of making wireless transmissions more secure.
False
True
True
