Multiple Choice
(From the box,"Controlling 802.11 Transmission") CSMA-CA+ACK usually is ________.
A) required
B) optional
Correct Answer:

Verified
Correct Answer:
Verified
Q19: WLANs normally use _.<br>A)licensed bands<br>B)unlicensed bands
Q39: To handle multiple conversations in radio transmission,you
Q40: (From the box,"Controlling 802.11 Transmission")Which of the
Q41: In 802.11,channel bandwidth usually is _.<br>A)20 GHz<br>B)40
Q42: If a radio transmission is easily blocked
Q45: The terms channel and service band mean
Q46: Cellular telephony uses _.<br>A)an omnidirectional antenna<br>B)a dish
Q48: Which unlicensed band provides greater propagation distance
Q49: Attenuation with distance is faster with _.<br>A)UTP
Q97: Interference is minimized in _.<br>A)licensed bands<br>B)unlicensed bands