单项选择题
Which of the following cable types is the LEAST affected by EMI？（）
A.STP B.Coax C.UTP D.Fiber
单项选择题 WhichofthefollowingdevicessetstheframingtypeonaT1circuit？（）
单项选择题 AcompanywantsallIMchatviatheinternettostop.AtechnicianblocksIRCtrafficwithatrafficshapingdevice，yetIMchatremainsuseable.Whichofthefollowingshouldatechniciandonext？（）
单项选择题 A100paircableis typicallyusedtoconnect：（）
