单项选择题
Which of the following devices sets the framing type on a T1 circuit？（）
A.Transceiver B.Gateway Modem C.Router D.CSU/DSU
单项选择题 AcompanywantsallIMchatviatheinternettostop.AtechnicianblocksIRCtrafficwithatrafficshapingdevice，yetIMchatremainsuseable.Whichofthefollowingshouldatechniciandonext？（）
单项选择题 A100paircableis typicallyusedtoconnect：（）
单项选择题 WhichofthefollowingisthemaximumtransmissionspeedofCAT5e？（）
