Online It certification exam–Pass4side

11. What are some common specifications for 802.11 WLAN antennas?
A. Spectral Purity Rating
B. Frequency Range in MHz
C. Impedance in Ohms
D. VSWR Rating
E. Return Loss Rating
F. Polarization
Answer: BCDF

 

12. What word describes an RF signal that bounces off a smooth or coated surface and changes direction?
A. Diffraction
B. Reflection
C. Refraction
D. Diffusion
E. Scattering
Answer: B

13. What is the most common mount type for installing a wireless LAN antenna to an outdoor mast (pole)?
A. Suction cups with threaded posts
B. Perforated radome enclosure
C. Magnetic mount with bulkhead adapter
D. U-bolt with base clamp
E. Tilt-n-swivel universal mount with ratchet adjustment
Answer: D

14. What determines the orientation of an RF wave as it leaves the antenna element?
A. Propagation Pitch
B. Polarization
C. Wave Front Trajectory
D. Signal Focus Angle
E. Acclimatization
Answer: B

15. In 802.11a WLANs, what statements are true concerning the use of Orthogonal Frequency Division Multiplexing
(OFDM)?
A. Six (6) “pilot” sub-carriers are used as a reference to disregard frequency and phase shifts of the signal during
transmission.
B. OFDM transmissions in the lower U-NII band are limited to 40 mW.
C. 16QAM modulation is used at the 54 Mbps data rate.
D. The OFDM PHY is divided into two sub-layers, the LLC and PLCP.
E. Forty-eight (48) sub-carriers are used as parallel symbol transmission paths.
Answer: BE

16. You have been hired by ABC Company to troubleshoot their 802.11abgh-compliant, Wi-Fi-certified access point and
wireless client devices. After completing a site survey, you identify five neighboring 802.11b access points belonging
to XYZ Company; one on channel 1, three on channel 6, and one on channel 11. To best avoid co-channel and adjacent
channel interference, what suggested change is most appropriate?
A. Configure ABC Company’s access point to use channel 1, 802.11g OFDM-only mode, and to operate in PCF mode.
B. Configure ABC Company’s access point to use channel 3, 802.11g-standard mode, and to use the RTS/CTS protection
mechanism all the time.
C. Configure ABC Company’s access point to use 802.11a with dynamic frequency selection (DFS).
D. There is no available configuration that would avoid co-channel or adjacent-channel inteference in this situation.
Answer: C

17. What facts should you consider when choosing a spread spectrum technology for your wireless LAN network?
A. An 802.11b Direct Sequence Spread Spectrum (DSSS) signal offers higher data rates and is less susceptible to
narrowband interference than an 802.11 Frequency Hopping Spread Spectrum system.
B. While 802.11g devices can use either DSSS or OFDM technology, 802.11a devices only support OFDM. Therefore
802.11g devices always use OFDM to communicate with 802.11a devices.
C. When 802.11b devices are present in an 802.11g BSS, the use of DSSS will diminish network throughput significantly
over a purely OFDM environment.
D. An 802.11g system supporting only the data rates required by the 802.11g amendment can interoperate with 802.11b
devices.
E. 802.11g systems use OFDM technology to obtain speeds equal to 802.11a systems and to communicate with 802.11b
devices.
Answer: CD

18. What device feature is user configurable for 802.11i-compliant wireless LAN client devices?
A. 802.1Q Tagging
B. SNMP Community Strings
C. TKIP Configuration Parameters
D. RADIUS Server IP Port
E. EAP Authentication Type
Answer: E

19. What IEEE documents specify methodologies for seamless roaming between access points?
A. 802.11j
B. 802.11d
C. 802.11F
D. 802.11s
E. 802.11N
F. 802.11r
Answer: C

20. According to the 802.11g amendment, how much separation is required between the center frequencies of
non-overlapping ERP channels?
A. 10 MHz
B. 11 MHz
C. 20 MHz
D. 22 MHz
E. 25 MHz
F. 30 MHz
Answer: E
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11. What are some common specifications for 802.11 WLAN antennas?
A. Spectral Purity Rating
B. Frequency Range in MHz
C. Impedance in Ohms
D. VSWR Rating
E. Return Loss Rating
F. Polarization
Answer: BCDF 

12. What word describes an RF signal that bounces off a smooth or coated surface and changes direction?
A. Diffraction
B. Reflection
C. Refraction
D. Diffusion
E. Scattering
Answer: B

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13. What is the most common mount type for installing a wireless LAN antenna to an outdoor mast (pole)?
A. Suction cups with threaded posts
B. Perforated radome enclosure
C. Magnetic mount with bulkhead adapter
D. U-bolt with base clamp
E. Tilt-n-swivel universal mount with ratchet adjustment
Answer: D

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1. What factors affect the propagation distance of an RF signal?
A. Antenna gain
B. Receiving station sensitivity
C. Fresnel zone blockage
D. Power over Ethernet (PoE) usage
E. Antenna polarization
F. Link budget calculations
Answer: AC 

2. Given: XYZ Corporation is experiencing connectivity problems with their existing building-to-building bridge link.
A brick wall on the roof of one building is partially blocking the Fresnel Zone, and the connection is dropping many
frames. The administrator moves the antenna to an area not obstructed by the brick wall and then realizes the RF cable
cannot reach the new location.
If an RF extension cable is used, what are the likely results?
A. The data throughput rate will increase because VSWR will decrease.
B. The Equivalent Isotropically Radiated Power (EIRP) will decrease.
C. The antenna coverage area will decrease.
D. The return loss will increase unless the impedance of the RF extension cable is equal to 50% of the antenna
impedance.
E. The likelihood of a direct lightning strike will increase, placing the entire WLAN system at risk.
Answer: BC

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3. While working on a presentation document in a conference room equipped with a wireless network, you notice that, as
you turn your laptop in different directions, your wireless signal strength changes. What RF signal property is primarily
responsible for this change in signal strength?
A. The RF signal’s amplitude is changing due to a change in the visual line-of-sight.
B. The RF signal’s wavelength is being affected by varying antenna gain.
C. The RF signal’s multipath is changing the amount of RF absorbed by nearby objects.
D. The RF signal’s phase is oscillating due to electromagnetic interference (EMI).
E. The RF signal’s polarization is different than the receiving antenna.
Answer: E

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