CIS 321 Quiz 6
________ is among the most widely used 802.11 transmission standards used today and dominates Wi-Fi sales.
802.11ac
The 802.11 standard has two mechanisms for media access control. One of the two, _________ is reliable, mandatory, and more efficient and faster.
CSMA/CA+ACK
________ is a technique for preventing two wireless stations from interfering with each other by transmitting at the same time.
Media access control
Wireless access points typically link wireless clients to ________.
servers on the wired network
What propagation problem becomes worse when there is a large, and dense, object between sender and receiver?
shadow zones (dead zones)
In general, the fewer the channels, ________.
the greater the likelihood of interference between access points
WLANS normally use ________ because they allow greater flexibility.
unlicensed bands
________ have SSIDs.
Wireless access points
What propagation problem is especially bad in moist air?
absorptive attenuation
MIMO _____________. A. increases transmission speed B. increases transmission distance C. both A and B D. neither A nor B
both A and B
Wide bandwidth channels that permit high speed data transmission are known as ___________ channels.
broadband
Wireless radio transmission speed is usually measured in terms of ______ which is measured in terms of ______.
frequency, hertz
Spread spectrum transmission is used in WLANs because __________ and _________.
it is required by regulators, is a more reliable transmission
Companies prefer the 5 GHz band because there is ________ than in the 2.5 GHz
more bandwidth
The most serious problem with wireless transmission in WLANs is ________.
multipath interference
What is the bandwidth of a channel that extends from 55 MHz to 60 MHz?
5 MHz
Wi-Fi Standards come from the ________ Working Group.
802.11
Wi-Fi normally uses a(n) ________.
omnidirectional antenna
