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