According to the following statement， can you tell me which term is described？（） It is the air return for an air conditioned system. In most buildings， the area above a drop ceiling orunder a raised floor is used as the air return （source of air） for the air conditioning. Those drop ceiling and raised floors are also where wire is often installed. If wire and cable is installed in a dropceiling or raised floor， it is out of sight. If that cable were burning， it would give off toxic fumes.These would be fed to the rest of the building by the air conditioner. As a result， people could beinjured even though they are a long way from the fire.

A. DAS area
B. plenum area
C. extended area
D. RF special area

How is attenuation measured？（）

A. Fresnel units
B. decibels
C. EIRP
D. milliamperes
E. ohm

Which statement regarding the site-survey process is correct？（）

A. In a multifloor building， the access point layout from the survey of one floor can be directly applied to the remaining floors
B. Access points can be installed in the same place on every floor， without worrying about co-channelinterference
C. You can survey with a Cisco AIR-ANT5959 in a plenum environment
D. Identify all hazardous and restricted areas that might require extra or special survey and installationwork

For an active Cisco Unified Wireless IP Phone 7921G 5 GHz site survey， what are the mostappropriate client test settings to use with the AirMagnet site survey tool？（）

A. 100 mW， 24 Mb/s
B. 100 mW， 18 Mb/s
C. 25 mW， 18 Mb/s
D. 3.2 mW， 54 Mb/

Which two methods can be used to prevent or reduce RFI from colocated directional antennas（）

Alternate polarization between colocated antennas
B. Cross-polarize antennas between endpoints
C. Install an RF-shielded box around the antennas
D. Increase the distance between the antenna

When surveying for VoWLAN， which power level should you base the access point coverage designon？（）

A. 40mW maximum transmit power
B. average power level of the VoWLAN clients
C. 100mW transmit power
D. lowest power level of the VoWLAN client

商业银行为什么要积极开展中间业务。

What statement best describes Cisco WCS support for antennas？（）

A. Cisco WCS supports third-party antennas for location applications.
B. Access points that are defined with third-party antennas will not participate in rogue on-demand location tracking.
Cisco WCS supports third-party antenna gain， azimuth， and elevation progation patterns.
D. Access points that are defined with a third-party antenna in Cisco WCS will display coverage heat maps.

Which statement about active and passive surveys is incorrect？（）

Active mode does not require the client to be specifically confgured
B. Passive mode can survey more than one access point at a time
C. Active mode yields signal-quality information such as packet retries and lost packets
D. Active mode requires more time to survey but yields more information results than passive mode doe

What will cause wireless voice devices to perform poorly？（）

A. average signal strength that is greater than -67 dBi
B. cell overlap of 15 to 20 percent
C. uneven wireless coverage
D. absence of coverage hole