CWNA-109 practice questions 71–80

1. Question 71 · 119 in bank

   You are implementing a VHT-capable AP. Which one of the following channels is available in the 802.11-2020 standard that was not available before the ratification of 802.11ac?

   • A153
   • B144
   • C161
   • D56

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   Answer: B

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2. Question 72 · 119 in bank

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

   • AOFDM modulation is used only in 5 GHz 802.11 transmissions.
   • BOFDM implements BPSK modulation which allows for data rates up to 7 Gbps.
   • COFDM was first introduced in 802.11a and is used by the ERP, HT and VHT PHYs as well.
   • DOFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.

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   Answer: C

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3. Question 73 · 119 in bank

   Which IEEE 802.11 physical layer (PHY) specification includes support for operation in the 2.4 GHz, 5 GHz, and 6 GHz bands?

   • AVHT (802.11ac)
   • BHR/DSSS (802.11b)
   • CHE (802.11ax)
   • DHT (802.11n)

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   Answer: C

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4. Question 74 · 119 in bank

   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?

   • AIBSS
   • BWPAN
   • CAd-hoc
   • DBSS

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   Answer: D

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5. Question 75 · 119 in bank

   What factor is likely to cause the least impact on the application layer throughput of an 802.11n 1x1:1 client station in a 2.4 GHz HT BSS operated by a 3x3:3 AP?

   • AImplementing more than 50 other stations in the same BSS using 802.11g radios
   • BImplementing another AP on the same channel in the same coverage area with more than 20 associated clients
   • CImplementing Fast BSS Transition (FT) for roaming
   • DIncreasing the number of spatial streams in use by the client station to 3x3:3

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   Answer: C

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6. Question 76 · 119 in bank

   What ID is typically mapped to an AP’s MAC address if a single BSS is implemented?

   • ASSID
   • BVLAN ID
   • CAssociation ID
   • DBSSID

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   Answer: D

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7. Question 77 · 119 in bank

   What is appended to the end of each 802.11 data frame after the payload or MSDU?

   • AFCS
   • BPreamble
   • CPHY Header
   • DMAC Header

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   Answer: A

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8. Question 78 · 119 in bank

   When an ACK frame is not received by the transmitting STA, what is assumed?

   • AThe frame was correctly delivered
   • BThe receiver processed the frame, but did not respond with an ACK frame because 802.11w is enabled
   • CThe receiver is offline
   • DThe frame was not delivered and must be retransmitted

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   Answer: D

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9. Question 79 · 119 in bank

   When a client station sends a broadcast probe request frame with a wildcard SSID, how do APs respond?

   • AFor each probe request frame, only one AP may reply with a probe response
   • BEach AP checks with the DHCP server to see if it can respond and then acts accordingly
   • CEach AP responds in turn after preparing a probe response and winning contention
   • DAfter waiting a SIFS, all APs reply at the same time with a probe response

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   Answer: C

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10. Question 80 · 119 in bank

    What security solution is deprecated in the 802.11 standard and should never be used in any modern WLAN deployment?

    • AShared Key Authentication
    • BOpen System Authentication
    • CCCMP
    • DAES

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    Answer: A

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CWNA-109 practice, question 71. 119 questions available.