Wireless LANs Chapter 7 Questions &
Answers
Which technique is used in 802.11g APs to reduce the possibility of collisions when
legacy 802.11b devices are within range?
a. OFDM
b. Changes to the PLCP frame format
c. CTS-to-Self
d. ACS - ANSWERSc. CTS-to-Self
The maximum mandatory rate of an IEEE 802.11a WLAN, according to the standard, is
____________.
a. 11 Mbps
b. 24 Mbps
c. 54 Mbps
d. 108 Mbps - ANSWERSc. 54 Mbps
The most important change made to the MAC layer of 802.11a was ___________.
a. To make the frame shorter
b. To increase security
c. To make the frames longer for efficiency
d. None of the above - ANSWERSd. None of the above
IEEE 802.11a achieves its increase in speed and flexibility over 802.11b by each of the
following except ____________.
a. Higher frequency
b. Using less bandwidth
c. More transmission channels
d. A new multiplexing technique - ANSWERSd. A new multiplexing technique
The Unlicensed National Information Infrastructure (U-NII) band operates in the
______________ frequency band.
a. 2.4 GHz
b. 33 GHz
