多项选择题
Which of the following are key characteristics of PPP? (Choose three.)（）
A.can be used over analog circuits B.maps Layer 2 to Layer 3 address C.encapsulates several routed protocols D.supports IP only E.provides error correction
多项选择题 WhatTCP/IPstackconfigurationfeaturescanDHCPprovide,inadditiontoassigninganIPaddress?(Choosethree.)（）
多项选择题 WhataretwocharacteristicsofTelnet?(Choosetwo.)（）
单项选择题 Whichofthefollowingistrueregardingtheuseofswitchesandhubsfornetworkconnectivity?（）
