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QUESTION 151
Which statement best describes the ability of a wireless client to access and transmit a data frame to an AP?

A.    The client listens to the media until polled by the AP using PCF to send its data.
B.    The client listens to the media until a data frame is finished, at which time it transmits, unless a collision
of data frames has occurred.
C.    The client uses random countdown timers to start the transmission of a data frame.
D.    The client listens to the media and countdown timers to start the transmission of a data frame.

Answer: D
Explanation:
http://www.ciscopress.com/articles/article.asp?p=1271797&seqNum=2

QUESTION 152
Which statement about ZigBee technology is true?

A.    It has low power consumption.
B.    It is designed only for point-to-point communications.
C.    It ranges up to 250 meters.
D.    It supports data rates up to 1 and 2 Mb/s.

Answer: A
Explanation:
ZigBee is based on the IEEE 802.15.4 protocol for WPAN, and aims at developing hardware and applications with a low data rate but also low power consumption and low complexity –for example, to control sensors. ZigBee-based products can access up to 16 separate 5 MHz channels in the 2.4 GHz band and are not compatible with 802.11 devices. The maximum power of ZigBee is 60 mW. Devices use low.

QUESTION 153
Which four options are the characteristics of the original 802.11 protocol? (Choose four.)

A.    Defined DSSS and FHSS as possiblemethods for modulation
B.    Designed to operate in the 5 GHz ISM frequency spectrum
C.    The most common deployment is three non-overlapping channels that are 20 MHz wide
D.    The protocol sets the maximumthroughput at 1 Mb/s or 2 Mb/s
E.    Defined FHSS and OFDM aspossible methods for modulation
F.    The most common deployment is three non-overlapping channels that are 22 MHz wide
G.    Designed to operate in the2.4 GHz ISM frequency spectrum
H.    The protocol sets the maximum throughput at1 Mb/s

Answer: ACDG
Explanation:
FHSS is still described in the original 802.11 protocol, but another technique was preferred and adopted by all 802.11 networks: Direct Sequence Spread Spectrum. Instead of small channels and a jumping sequence, the information is sent over a wider channel. This channel is 22 MHz wide (if the center frequency is 2.412, this channel spans from 2.401 GHz to 2.423 GHz) and does not move (no hopping, which is why the sequence is said to be direct instead of hopping). Then, over this 22 MHz channel, several bits of information are sent in parallel. If a source of interference affects part of the channel, it will prevent only the bits sent in that frequency from reaching the receiver.

QUESTION 154
Which two attacks does Management Frame Protection help to mitigate? (Choose two.)

A.    Eavesdropping
B.    Denial of Service
C.    War Driving
D.    Man-in-the-Middle

Answer: BD
QUESTION 155
Drag and Drop Questions

Answer:

QUESTION 156
Drag and Drop Questions

Answer:

QUESTION 157
Drag and Drop Questions

Answer:

QUESTION 158
Drag and Drop Questions

Answer:

QUESTION 159
Drag and Drop Questions

Answer:

QUESTION 160
Drag and Drop Questions

Answer:

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