After the site installation is complete， you should verify the mobility of the VoWLAN device whilewalking the site on an active phone call. Which Cisco WLC or Cisco WCS command is mostbeneficial in determining roaming efficiency？（）

单项选择题Whatwillcausewirelessvoicedevicestoperformpoorly？（）

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 holes

单项选择题WhatdoesaCiscoUnifiedWirelessIPPhone7921Gdeploymentrequire（）？

A.more access points than a data network
B.fewer access points than a data network
C.less SNR than a data network
D.specific relative access point placement

单项选择题WhichantennagenerallyhasthenarrowestfirstFresnelzoneinboththehorizontalandverticalplanes？（）

A.omnidirectional
B.patch
C.Yagi
D.sector
E.parabolic dish

多项选择题WhichtwomethodscanbeusedtopreventorreduceRFIfromcolocateddirectionalantennas（）

A.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 antennas

单项选择题Ciscorecommendsadecibelreferencedto1milliwattsignallevelforthecoveragecelledgeatthepredetermineddataratethatisneededtosupporttheVoWLANdeviceandcallcapacityrequirements.WhatisthatsignallevelvalueforCiscoUnifiedWirelessIPPhones7920，7921G，and7925G？（）

A.-65 dBm
B.-67 dBm
C.-69 dBm
D.-70 dBm