What factors influence the distance that an RF signal can be effectively received? (Choose 3)
A. Transmitting station's power source
B. Receiving station's radio sensitivity
C. Free Space Path Loss
D. MAC layer encryption
E. Transmitting station'soutput power
F. Temperature in the Fresnel zone
AP-1 is a 3x3:2 AP. STA-3 is a 3x3:3 client. What is the maximum number of spatial streams that can be used for a downlink HT-OFDM transmission from AP-1 to STA-3?
A. One spatial stream, because the definition of the AP indicates that it is capable of only one spatial stream.
B. Three spatial streams, because the definition of the client indicates that it is capable of only three spatial streams.
C. Two spatial streams, because the definition of the AP indicates that it is capable of only two spatial streams.
D. Three spatial streams, because the definition of the AP indicates that it is capable of only three spatial streams.
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.
The center frequency of channel 1 in the 2.4 GHz band is 2.412 GHz (2412 MHz).
What is the center frequency of channel 4?
A. 2.413 GHz
B. 2.417 GHz
C. 2.422 GHz
D. 2.427 GHz
E. 2.437 GHz
XYZ Company has hired you to perform an indoor site survey of their 5-storyfacility. They own the building and rents out unused floors (floors 2 and 4) to other companies, and the other companies already use
802.11 WLANs. XYZ Company wants all of the offices they occupy to be surveyed as part of the project.
What actions should be recommended as part of the site survey project? (Choose 2)
A. Verify that RF signals from XYZ Company's APs are not penetrating outside the perimeter of the building.
B. Determine how much signal strength is passing between floors.
C. Locate wiring closets on each floor occupied by XYZ Company.
D. Identify security best practice violations on neighboring WLANs.
E. Verify that XYZ Company's APs are not directly above or below APs on adjacent floors.
What term describes the effect of increasing the intensity of an RF wave withan antenna by focusing the energy in a specific direction?
A. Distributed Radiation
B. Active Amplification
C. Beam Compression
D. Passive Gain
E. RF Flooding
ABC Company has a 2.4 and 5 GHz WLAN deployment. DFS functionality is enabled as required by the regulatory domain andAPs use DFS channels as long as radar is not detected. Band steering is also enabled to encourage dual-band clients to use frequency bands with more capacity.
Your performance analysis shows that many dual-band VoWiFi client devices will move back and forth between 2.4 and 5 GHz as the users roam throughout the building. All APs have 2.4 and 5 GHz radios enabled with transmit power adjusted to accommodate relatively similar cell sizes.
This "band hopping" behavior is viewed by network staff to be undesirable. What is the most likely cause of the unpredictable client band selection behavior?
A. Interference from 5 GHz radar sources has increased frame corruption and retries on channels 36-48.
B. 5 GHz frequencies offer better RF penetration than 2.4 GHz, but2.4 GHz offers more voice call capacity and lower latency than 5 GHz.
C. The voice client does not support DFS, and therefore experiences some 5 GHz coverage holesas it moves through the network.
D. The client's band selection algorithm prefers 5 GHz, butband steering behavior usually steers 75-85% of client devices to 2.4 GHz.
You are using a tool that allows you to see signal strength for all APs in the area with a visual representation. It showsyou SSIDs available and the security settings for each SSID. It allows you to filter by frequency band to see only 2.4 GHz networks or only 5 GHz networks. No additional features are available. What kind of application is described?
A. Site survey utility
B. Protocol analyzer
C. Spectrum analyzer
D. WLAN discovery tool
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? (Choose 3)
A. 802.11ad compatibility
B. TPCsupport
C. Impedance in Ohms
D. Elevation Beamwidth
E. Return Loss Rating
F. Operating Frequencies
What factors are taken into account when calculating theLink Budget of a point-to-point outdoor WLAN bridge link?
A. Antenna height
B. Transmit power
C. Operating frequency
D. Transmit antenna gain
