Certified Wireless Network Administrator v8.0 (CWNA-106)

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Total 138 questions

The IEEE 802.11-2012 standard requires VHT capable devices to be backward compatible with devices using which other 802.11 physical layer specification (PHY)?

  • A. OFDM
  • B. HR/DSSS
  • D. DSSS

Answer : A

What statements about the beamwidth of an RF antenna are true? (Choose 2)

  • A. Thelower the gain of an antenna, the moreap-1 is narrow one or both beamwidths become.
  • B. The beamwidth patterns on an antenna polar chart indicate the point at which the RF signal stops propagating.
  • C. Horizontal and vertical beamwidth are calculated at thepoints in which the main lobe decreases power by 3 dB.
  • D. Horizontal beamwidth is displayed (in degrees) on the antenna’s Azimuth Chart.

Answer : C,D

What type of device often causes interference across 50% or more of the 2.4 GHz frequency band?

  • A. Military radar
  • B. Properly configured AP
  • C. Microwave oven
  • D. Wireless video camera
  • E. WIPS sensor

Answer : C

ABC Company has thousands of Wi-Fi users accessing their network on a daily basis.
Their WLAN consists of 700 access points, 6 WLAN controllers, and a wireless network management system.
Whatnetwork functions are performed by the enterprise-class WNMS?

  • A. Radio management, fast roaming, key caching, and other centralized control plane operations
  • B. Centralized bridging of guest data traffic and application of firewall and QoS policies to data
  • C. Management of WLAN controller configuration and provisioning of firmware updates
  • D. Generating, encrypting, and decrypting 802.11 frames and collecting RF radio data.

Answer : C

What statements describe industry practices for communication protocols between
WLANcontrollers and controller-based APs? (Choose 2)

  • A. All vendors use the same protocol so that APs will interoperate with WLAN controllers from other vendors.
  • B. Some vendors use proprietary protocols, and some vendorsuse protocols based on public standards like RFCs.
  • C. For most vendors, the controller-based APs maintain data and control tunnels with at least two controllers for immediate failover and redundancy.
  • D. All vendors support at least one L2 or L3 broadcastprotocol for controller discovery by controller-based APs.
  • E. All vendors recommend using L2 (instead of L3) controller discovery and tunneling protocols in large enterprises.

Answer : B,D

ABC Company is planning toinstall a new 802.11ac WLAN, but wants to upgrade its wired infrastructure first to provide the best user experience possible. ABC Company has hired you to perform the RF site survey. During the interview with the network manager, you are told that the newEthernet edge switches will support VoIP phones and 802.11 access points, both using 802.3 PoE.
After hearing this information, what immediate concerns do you note?

  • A. VoIP phones and 802.11 access points should not be powered by the same edge switch dueto distortion.
  • B. The edge Ethernet switches should support Ether-channel to get the best results out of the network.
  • C. If the switches are in optimal locations for VoIP phones, they are likely to be suboptimal locations for 802.11 APs.
  • D. The power budget in the edgeswitches must be carefully planned and monitored based on the number of supported PoE devices.

Answer : D

What is the intended use for the WLAN hardware known as a pole or mast mount unit?

  • A. Mounting a lightningarrestor to a grounding rod
  • B. Mounting anomnidirectional antenna to a mast
  • C. Mounting an RF amplifier to a dipole antenna
  • D. Mounting a PoE injector to a perforated radome
  • E. Mounting an access point to a site survey tripod

Answer : B

In a Wi-Fi client configuration utility, what feature is most likely to be user configurable?

  • A. 802.1p to WMM mappings
  • B. SNMPv3 Users
  • C. WMM-PS Dozing Interval
  • D. RADIUS Server IP Address
  • E. EAP Authentication Type

Answer : E

What causes of hidden nodes within a BSS would be more likely lead to an increase in collisions and retries? (Choose 2)

  • A. Data frames too large for the physical environment
  • B. Client stationsbroadcasting with too much power
  • C. Access points broadcasting with too little power
  • D. Client stations too close in proximity to each other
  • E. Obstacles between client stations causing attenuation
  • F. Large 802.11 cells with physically distributed stations

Answer : E,F

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

  • A. 802.11a and 11n use six (6) pilot subcarriers as a reference for thereceiver to detect frequency and phase shifts of the signal.
  • B. 802.11a/g/n OFDM includes several combinations of modulation and coding to achieve data rates from 1-600 Mbps.
  • C. With 802.11a OFDM, 16-QAM provides either 48 or 54 Mbps data rates, dependingupon coding rates.
  • D. 802.11ac VHT-OFDM utilizes 256-QAM, which increases the data rate significantlyover 64-QAM available in HT-OFDM.
  • E. In 802.11a OFDM, fifty-six (56) subcarriers are used as parallel symbol transmission paths to carry data.

Answer : D

What feature was introduced in the 802.11h amendment in order to uphold regulatory requirements for 5 GHz operations.

  • A. 256-QAM
  • B. Distributed Coordination Function (DCF)
  • C. Transmit Power Control(TPC)
  • D. Radio Resource Management (RRM)

Answer : C

What factors are taken into account when calculating theLink Budget of a point-to-point outdoor WLAN bridge link?

  • A. Operating frequency
  • B. Transmit antenna gain
  • C. Transmit power
  • D. Antenna height

Answer : A,B,C

When a client moves to a new BSS within an ESS, whatstep is a part of the 802.11 reassociation process?

  • A. The client station transmits a Reassociation Request frame to its currentaccess point.
  • B. The current access point informs the IP gateway of the reassociation.
  • C. The current access point triggers theclient’s reassociation service.
  • D. The new access point transmits a Reassociation Response to the client station with a status value.

Answer : D

Which one of the following channels can be used for VHT transmissions?

  • A. 11
  • B. 6
  • C. 48
  • D. 1

Answer : D

You are selecting antennas for a WLAN operating in the 5 GHz frequency band. What specifications should be evaluated for an antenna before it is implemented in this WLAN system?

  • A. 802.11ad compatibility
  • B. TPC support
  • C. Impedance in Ohms
  • D. Return Loss Rating

Answer : C

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Total 138 questions