Quiz
Wireless Chapter 18
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Fragen in diesem Quiz (20)
1Thirty 2x2:2 access points have been deployed at a school where all the client devices are 1x1:1 802.11n tablets. The access points are transmitting on 20 MHz channels with the standard guard interval of 800 ns. What is the highest 802.11n data rate that can be used for communications between the APs and tablets?
- A54 Mbps
- B65 Mbps
- C72 Mbps
- D150 Mbps
- E300 Mbps
2How can a MIMO system increase throughput at the Physical layer?
- ASpatial multiplexing
- BA-MPDU
- CTransmit beamforming
- D40 MHz channels
- EDual-CTS protection
3Which new power-management method defined by the 802.11 amendment conserves power by powering down all but one radio?
- AA-MPDU
- BPower Save protection
- CPSMP
- DSM power save
- EPS mode
4The guard interval is used as a buffer to compensate for what type of interference?
- ACo-channel interference
- BAdjacent cell interference
- CRF interference
- DHT interference
- EIntersymbol interference
5Name some of the factors that a modulation and coding scheme uses to define data rates for an HT radio
- AModulation method
- BEqual/unequal modulation
- CNumber of spatial streams
- DGI
- EChannel size
6How can an HT radio increase throughput at the MAC sublayer of the Data-Link layer?
- AA-MSDU
- BRIFS
- CA-MPDU
- DGuard interval
- EMTBA
7Transmit beamforming uses what type of frames to analyze the MIMO channel before transmitting directed paths of data?
- ATrigger frames
- BBeaming frames
- CSounding frames
- DSM power save action frames
8A 3x3:2 MIMO radio can transmit and receive how many unique streams of data?
- ATwo
- BThree
- CFour
- DThree equal and four unequal streams
- ENone--the streams are not unique data
9Name a capability not defined for A-MPDU
- AMultiple QoS access categories
- BIndependent data payload encryption
- CIndividual MPDUs having the same receiver address
- DMPDU aggregation
10Which HT protection modes allow only for the association of HT stations in the HT basic service set?
- AMode 0 - Greenfield mode
- BMode 1 - HT nonmember protection mode
- CMode 2 - HT 20 MHz protection mode
- DMode 3 - HT mixed mode
11Which of these capabilities are considered mandatory for an 802.11n access point as defined by the Wi-Fi Alliance's vendor certification program called Wi-Fi CERTIFIED n?
- AThree spatial streams in receive mode
- BWPA/WPA2
- CWMM
- DTwo spatial streams in transmit mode
- E2.4 GHz - 40 MHz channels
12MIMO radios use which mechanisms for transmit diversity?
- AMaximum ratio combining (MRC)
- BSpatial multiplexing (SM)
- CSpace-time block coding (STBC)
- DCyclic shift diversity (CSD)
- EMultiple traffic ID block acknowledgment (MTBA)
13802.11n radios are backward compatible with which of the following types of 802.11 radios?
- A802.11b radios
- B802.11a radios
- C802.11 legacy radios
- D802.11g radios
14How does transmit beamforming use multiple MIMO antennas to increase range?
- ABeamsteering
- BPhase shifting
- CDynamic beamforming
- DSpatial multiplexing
15Which HT PDDU formats support noth 20 MHz and 40 MHz channels?
- ANon-HT legacy format
- BPCO mode
- CHT Mixed format
- DHT Greenfield format
16A WLAN consultant has recommended that a new 802.11n HT network be deployed by using channels in the 5GHz U-NII bands. Why would he recommend 5 GHz over 2.4 GHz?
- AHT radios do not require DFS and TPC in the 5 GHz bands
- BHT radios get better range using TxBF in the 5 GHz bands
- C40 MHz channels do not scale in the 2.4 GHz ISM band
- D5 GHz HT radios are less expensive than 2.4 GHz HT radios
17What 802.11n mode of operation sends the same data on two adjacent 20 MHz channels?
- AGreenfield mode
- BHT mixed mode
- CNon-HT duplicate mode
- DLDPC mode
18What frequencies are defined for 802.11n radio transmissions?
- A902-928 MHz
- B2.4-2.4835 GHz
- C5.15-5.25 Ghz
- D5.25-5.35 MHz
19What PHY layer mechanism might be used to increase throughput for an HT radio in a clean RF environment with minimal reflections and low multipath?
- AMaximum ratio combining
- B400 nanosecond guard interval
- CSwitched diversity
- DSpatial multiplexing
- ESpatial diversity
20What PHY layer mechanisms might be used to increase the range for an 802.11n radio using a MIMO system?
- AMaximum ratio combining
- BGuard interval
- CTransmit beamforming
- DSpatial multiplexing
Informationen
- Beschreibung
- Quiz am Wireless Chapter 18, erstellt von Kyle Boehmer am 31/10/2018.
- Autor
- Kyle Boehmer
- Sprache
- English
- Aufrufe
- 0
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