单项选择题
A.Satellite
B.DSL
C.Cable
D.Fiber
单项选择题 WhichofthefollowingcabletypesistheLEASTaffectedbyEMI？（）
单项选择题 WhichofthefollowingdevicessetstheframingtypeonaT1circuit？（）
单项选择题 AcompanywantsallIMchatviatheinternettostop.AtechnicianblocksIRCtrafficwithatrafficshapingdevice，yetIMchatremainsuseable.Whichofthefollowingshouldatechniciandonext？（）