单项选择题
What amount of cell overlap ensures smooth roaming for wireless endpoints？（）
A.5~10% B.10 ~15% C.15~20% D.20~25%
单项选择题 HowmanychannelsaredefinedintheIEEE802.11bDSSSchannelset？（）
单项选择题 Whichsignalandnoisevalueswillresultinthebestphonecommunicationwithanaccesspoint？（）
单项选择题 Toensurequality，whatisthemaximumend-to-endtransittimeinmillisecondsonavoice network？（）
