单项选择题 WhatbestdescribesthefeaturesoftheCisco850Seriesrouters？（）

单项选择题 Whichofthefollowingislessvulnerabletothreatsandattacksbecauseitisnotassociatedwithonespecificoperatingsystem？（）

单项选择题 Inwhichofthesephasesisacustomersnetworkassessedtodetermineitssystemreadiness？Selectexactly1answer（s）fromthefollowing：（）。