Exam 6: Wireless Lans I

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

The frequency spectrum extends ________.

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

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

Beamforming can allow an access point to ________.

Spread spectrum transmission is used in WLANs because ________.

Wireless access points typically link wireless clients to ________.

A cellular telephone uses a(n)________.

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?

Access points in the same ESS communicate via ________.

Frequency is measured in terms of ________.

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

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

Radio transmission is measured in terms of ________.

WLANs normally use ________.

MIMO ________.

What propagation problem becomes worse as frequency increases?

What propagation problem is especially bad in moist air?

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.

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