CWNA-109 practice questions 81–90

1. Question 81 · 119 in bank

   You are reconfiguring an AP to use the short guard interval for 802.11ac. How long will the new guard interval duration be after the change?

   • A800 ns
   • B800 ms
   • C400 ns
   • D400 ms

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   Answer: C

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2. Question 82 · 119 in bank

   You manage a WLAN with 100 802.11ac access points. All access points are configured to use 80 MHz channels. In a particular BSS, only 40 MHz communications are seen. What is the likely cause of this behavior?

   • AThe AP is improperly configured to use only 40 MHz of the 80 MHz allocated bandwidth
   • BThe short guard interval is also enabled
   • CThe clients are all 802.11n STAs
   • DAll clients implement single spatial stream radios

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   Answer: C

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3. Question 83 · 119 in bank

   When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?

   • ALegacy Power Save mode was made obsolete in the 802.11ac amendment
   • BVHT TXOP power save allows the WLAN transceiver to disable more components when in a low power state
   • CVHT TXOP power save uses the partial AID in the preamble to allow clients to identify frames targeted for them
   • DVHT TXOP power save allows stations to enter sleep mode and legacy Power Save does not

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   Answer: C

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4. Question 84 · 119 in bank

   What 802.11 network configuration would result in multiple stations broadcasting Beacon frames with the same BSSID but with different source addresses?

   • AAn SCA network is in use
   • BA single AP supports multiple BSSs with different SSIDs
   • CMultiple APs have been loaded with the same configuration from an image file
   • DAn IBSS is used instead of a BSS

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   Answer: C

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5. Question 85 · 119 in bank

   What primary metric of scanning can stations use to select the best AP for connectivity to the desired BSS?

   • ASignal strength of AP beacons received
   • BFCS errors in frames transmitted to and from the AP
   • CPING latency when testing against an Internet server
   • DThroughput speed in Mbps

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   Answer: A

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6. Question 86 · 119 in bank

   Lynn runs a small hotel, and as a value-added service for his customers he has implemented a Wi-Fi hotspot. Lynn has read news articles about how hackers wait at hotspots trying to take advantage of unsuspecting users. He wants to avoid this problem at his hotel. What is an efficient and practical step that Lynn can take to decrease the likelihood of active attacks on his customers’ wireless computers?

   • AEnable station-to-station traffic blocking
   • BImplement Network Access Control (NAC) and require antivirus and firewall software along with OS patches
   • CImplement an SSL VPN in the WLAN controller that all AP use to connect with it
   • DRequire EAP-TLS authentication and provide customers with a username/password on their receipt

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   Answer: A

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7. Question 87 · 119 in bank

   You have been tasked with creating a wireless link between two buildings on a single campus. The link must support at least 150 Mbps data rates. What kind of WLAN technology role should you deploy?

   • AWireless bridging
   • BIBSS
   • CWPAN
   • DAccess BSS

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   Answer: A

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8. Question 88 · 119 in bank

   When implementing PoE, what role, if any, is played by a switch?

   • APSE
   • BPD
   • CPower splitter
   • DMidspan injector

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   Answer: A

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9. Question 89 · 119 in bank

   A dual-band 802.11ac AP must be powered by 802.3at PoE. As a class 4 device, what minimum power level should be received at the AP assuming a proper cable length?

   • A25.5 W
   • B30 W
   • C12.95 W
   • D15.4 W

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   Answer: A

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10. Question 90 · 119 in bank

    A WLAN is implemented using wireless controllers. The APs must locate the controllers when powered on and connected to the network. Which one of the following is a method commonly used to locate the controllers by the APs?

    • ASNMP
    • BNTP
    • CDHCP
    • DGRE

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    Answer: C

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CWNA-109 practice, question 81. 119 questions available.