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Exam 6: Wireless Lans I

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Question 21

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Beamforming can allow an access point to ________.

A) direct power to individual clients
B) send signals to two different clients at the same time
C) both A and B
D) neither A nor B

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Question 22

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Spread spectrum transmission is used in WLANs because ________.

A) it is required by regulators
B) it offers strong security
C) both A and B
D) neither A nor B

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Question 23

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What propagation problem becomes worse as there is a large and dense object between sender and receiver?

A cellular telephone uses a(n) ________.

In CSMA/CD+ACK,when a wireless NIC wishes to transmit,it listens for traffic.If there is traffic,it waits.When the traffic stops,it may transmit immediately.

To use an access point,you need to know its ________.

What happens if two nearby access points use the same channel?

Radio transmission is measured in terms of ________.

WLANs normally use ________.

Compared to wired transmission,propagation problems in radio transmission are ________.

MIMO ________.

Wireless access points typically link wireless clients to ________.

Access points in the same ESS communicate via ________.

To transmit data very rapidly,you would want a ________ channel.

To handle multiple conversations in radio transmission,you normally use multiple ________.

What propagation problem becomes worse as frequency increases?

What propagation problem is especially bad in moist air?

Frequency is measured in terms of ________.

There is an access point that serves eight wireless hosts.On how many channels will these devices transmit and receive during the course of an hour or two?

The frequency spectrum extends ________.