Deck 8: Wi-Fi Wlan Security

Question 1

Which of the following is specifically designed to enhance support for audio and video in 802.11 WLANs?

A) wireless controllers
B) WPA2
C) wireless repeaters
D) WMM

Answer 1

D

Question 2

Which of the following is the best method for enhancing WLAN security in an enterprise?

A) using TKIP and WEP
B) deploying an authentication server on the network
C) changing frequencies periodically
D) installing equipment that supports 802.11s

Answer 2

B

Question 3

All 5 GHz bands are available to WLANs worldwide.

Answer 3

False

Question 4

The change the 802.11e amendment made to the MAC layer to enable WLAN traffic to be prioritized is called __________.

A) RSNA
B) QoS
C) VoWLAN
D) WPA2

Question 5

Which of the following is a key advantage of WPA2 over WEP?

A) It uses a much stronger encryption algorithm.
B) It supports EAP.
C) It supports TKIP and MIC.
D) All of the above.

Question 6

Which of the following is a reason that 802.11a is more efficient than 802.11g when both operate at the same data rate?

A) 802.11g has a longer SIFS.
B) 802.11a devices can handle more data.
C) 802.11a equipment is more sophisticated and expensive.
D) 802.11a time slots are shorter.

Question 7

Although such devices as 2.4 GHz cordless phones, microwave ovens, and Bluetooth devices may cause interference problems with 802.11b networks in the 2.4 GHz ISM band, they are not a problem with 802.11a.

Question 8

When actively using a network while roaming in an ESS, the process of connecting and disconnecting from the APs in one's path is called ________.

A) MIMO
B) handoff
C) switching
D) nomadic

Question 9

Each frequency channel in an 802.11a WLAN is 20 MHz wide and supports ______ subcarrier signals.

A) 56
B) 114
C) 52
D) 48

Question 10

Why is WEP considered far inferior to WPA and WPA2?

A) It transmits an unencrypted 24-bit IV.
B) The AP cannot properly authenticate the client devices.
C) It does not support encryption at all.
D) It is more secure than using RADIUS.

Question 11

One of the reasons that 802.11n achieves a higher bandwidth is that it bonds two ISM or U-NII channels. Another important reason is that it_____________.

A) eliminates multipath interference
B) uses antenna diversity
C) can transmit using multiple spatial streams
D) can transmit in any two frequency channels simultaneously

Question 12

How many pilot carriers are available in 802.11n in the U-NII band using 40 MHz of bandwidth?

A) 4
B) 2
C) 6
D) 8

Question 13

Which of the following is one of the most important reasons that companies deploy wireless controllers?

A) It enables bridging of multiple WLANs.
B) It enhances security.
C) It simplifies management of the WLAN.
D) Wireless controllers support TKIP.

Question 14

Although 802.11n can achieve data rates of 300 Mbps when using 40 MHz of bandwidth in the ISM band, one of the main challenges of deploying a WLAN in this frequency range is _________.

A) intersymbol interference
B) co-channel interference on channel 6
C) excessive multipath interference on channels 1 and 11
D) interference from the U-NII band

Question 15

The original IEEE 802.11 standard, established in 1997, was for WLANs operating at what maximum speed?

A) 1 Mbps
B) 2 Mbps
C) 3 Mbps
D) 4 Mbps

Question 16

The Unlicensed National Information Infrastructure (U-NII) band operates at the _____ frequency.

A) 2.4 GHz
B) 33 GHz
C) 5 GHz
D) 16 KHz

Question 17

The Federal Communications Commission (FCC) has segmented the 555 MHz of the original U-NII spectrum into four segments or bands, and each band has a maximum power limit.

Question 18

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

Question 19

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

Question 20

The most important change made to the MAC layer of 802.11a was ______.

A) to make the frames shorter
B) to increase security
C) to make the frames longer for efficiency
D) none of the above