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QUESTION NO: 12
You are implementing a VHT-capable AP. Which one of the following channels is available in the 802.11-2016 standard that was not available before the ratification of 802.11 ac?
QUESTION NO: 13
What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?
A. OFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.
B. OFDM was first introduced in 802.11 and is used by the ERP, HT and VHT PHYs as well.
C. OFDM implement BPSK modulation to allow for data rates up to 7 Gbps.
D. OFDM modulation is used only in 5 GHz 802.11 transmissions.
QUESTION NO: 14
Which IEEE 802.11 physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS?
A. VHT (802.11ac)
B. OFDM (802.11a)
C. DSSS (802.11-Prime)
D. HT (802.11n)
QUESTION NO: 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?
QUESTION NO: 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?
A. Increasing or decreasing the number of spatial streams in use by the client station and AP
B. Implementation of several other clients in the same BSS using 802.11 g radios
C. Implementing Fast BSS Transition (FT) for roaming
D. RF interface from more than 10 nearby Bluetooth transmitters
QUESTION NO: 17
What ID is typically mapped to an AP’s MAC address if a single BSS is implemented?
A. VLAN ID
C. Device ID
QUESTION NO: 18
What is appended to the end of each 802.11 data frame after the payload?
C. MAC header
D. PHY header
QUESTION NO: 19
When an ACK frame is not received by the transmitting STA, what is assumed?
A. The frame was correctly delivered
B. The frame was not delivered and must be retransmitted
C. The receiver is offline
D. The receiver processed the frame, but did not respond with an ACK frame because 802.11w is enabled