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