QUESTION: 13

What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?

OFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.
OFDM was first introduced in 802.11 and is used by the ERP, HT and VHT PHYs as well.
OFDM implement BPSK modulation to allow for data rates up to 7 Gbps.
OFDM modulation is used only in 5 GHz 802.11 transmissions.

Answer(s): B

Reference:

http://www.rhyshaden.com/802_11a.htm

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QUESTION: 14

Which IEEE 802.11 physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS?

VHT (802.11ac)
OFDM (802.11a)
DSSS (802.11-Prime)
HT (802.11n)

Answer(s): D

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QUESTION: 15

An 802.11-based network uses an AP and has several connecting clients. The clients include iPhones, iPads, laptops and one desktop. What WLAN use case is represented?

WPAN
Ad-hoc
BSS
IBSS

Answer(s): C

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QUESTION: 16

What factor is likely to cause the least impact on the application layer throughput of an 802.11n client station in a 2.4 GHz HT BSS?

Increasing or decreasing the number of spatial streams in use by the client station and AP
Implementation of several other clients in the same BSS using 802.11 g radios
Implementing Fast BSS Transition (FT) for roaming
RF interference from more than 10 nearby Bluetooth transmitters

Answer(s): C

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QUESTION: 16

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