Test
Wireless Chapter 19
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Preguntas del test (20)
1Which of the following technologies was optional in 802.11n and now mandatory in 802.11ac?
- AMIMO
- BRIFS
- CA-MPDU
- DA-MSDU
- ESU-MIMO
2With the first phase of 802.11ac supporting three spacial streams, what is the maximum transmission speed?
- A600 Mbps
- B1.3 Gbps
- C3.5 Gbps
- D6.933 Gbps
- E7.0 Gbps
3Which of the following modulation methods are supported with 802.11ac?
- ABPSK
- BBASK
- C32-QAM
- D64-QAM
- E256-QAM
4Which of the following channel widths are supported in 802.11ac?
- A20 MHz
- B40 MHz
- C80 MHz
- D80+80 MHz
- E160 MHz
5When a 160 MHz wide channel is used, how many primary channels are defined?
- A1
- B2
- C3
- D4
- ENone
6Using 256-QAM, how many bits are represented by each subcarrier?
- A1
- B2
- C4
- D6
- E8
7How many modulation and coding schemes are defined in 802.11ac?
- A8
- B10
- C64
- D77
- E256
8Which 802.11ac MCS range defines all of the MCSs that are mandatory?
- AMCS 0-2
- BMCS 0-4
- CMCS 0-6
- DMCS 0-7
- EMCS 0-8
- FMCS 0-9
9The 802.11ac amendment defines a maximum of how many spatial stream for an AP, and how many maximum devices can an AP communicate with at once?
- AOne spatial stream, four devices
- BOne spatial stream, eight devices
- CFour spatial streams, four devices
- DEight spatial streams, four devices
- EEight spatial streams, eight devices
10Requiring all frames to be transmitted as A-MPDU frames increases performance due to which of the following?
- AFrame overhead is reduced
- BBlock ACK is required
- CFrame information is shifted from the MPDU header to the PLCP header
- DReduced Interframe Space (RIFS) decreases the amount of time between frames
- EA-MSDU is required; A-MPDU is optional
11Which of the following technologies is part of explicit beamforming?
- AChannel sounding
- BFeedback matrix
- CSounding matrix
- DSteering matrix
- ENull data packet
- FChannel matrix
12What is the main reason that many smartphones do not support multiple spatial streams?
- AIt is difficult to install multiple antennas in the smart phone
- BThe size of the necessary technology would make the smartphone larger than desired
- CBattery consumption would be too great
- DMost smartphones actually do support four spatial streams
13Which of the following are QoS categories?
- AAC_VO (access category voice)
- BAC_DA (access category data)
- CAC_VI (access category video)
- DAC_BE (access category best effort)
- EAC_BK (access category background)
14When transmitting a QoS frame using MU-MIMO, which of the following statements is true?
- AVoice frames are always transmitted before lower-priority frames
- BThe category that is used to take control of the transmission is known as the primary access category
- CIf a lower category frame is transmitted, only higher category frames can be transmitted using the other spatial streams
- DLower category frames can be transmitted as long as they do not increase the transmission duration of the primary category
- EMultiple lower category frames can be transmitted along with the primary access category frame
15Name some of the factors that a modulation and coding scheme (MCS) uses to define data rates for a VHT radio?
- AModulation method
- BEqual/unequal modulation
- CNumber of spatial streams
- DGI
- EChannel size
- FCode rate
16Which of these capabilities are considered mandatory for a phase one 802.11ac access point as defined by the Wi-Fi Alliance's vendor certification program called Wi-Fi CERTIFIED ac?
- A20, 40 ,80, 160 MHz channel
- BMCS 0-7
- CMCS 0-8
- DTwo spatial streams
- ELong guard interval
17VHT radios are backward compatible with which of the following type of 802.11 technology?
- AClause 17 radios (HR-DSSS)
- BClause 18 radios (OFDM)
- CClause 14 radios (FHSS)
- DClause 19 radios (ERP)
- EClause 20 radios (HT)
18Which of the following statements is not true regarding the number of subcarriers in the following channels?
- A40 MHz subcarriers = 2 times 20 MHz subcarriers
- B40 MHz subcarriers > 2 times 20 MHz subcarriers
- C80 MHz subcarriers = 2 times 40 MHz subcarriers
- D80 MHz subcarriers > 2 times 40 MHz subcarriers
- E160 MHz subcarriers = 2 times 80 MHz subcarriers
- F160 MHz subcarriers > 2 times 80 MHz subcarriers
19The 802.11ac amendment defines a maximum of how many spatial streams for client?
- AOne spatial stream
- BTwo spatial streams
- CFour spatial streams
- DEight spatial streams
20Which 802.11ac technology is the most revolutionary?
- A80 MHz and 160 MHz channel widths
- BA-MPDU for all frames
- C256-QAM modulation
- D5 GHz only frequencies
- EMU-MIMO
- FExplicit beamforming
Información
- Descripción
- Test sobre Wireless Chapter 19, creado por Kyle Boehmer el 07/11/2018.
- Autor
- Kyle Boehmer
- Idioma
- English
- Visitas
- 1
- Valoración
- Aún sin valoraciones Valora este test