单项选择题 Whichofthefollowingisaconnectionorientedtransportlayerprotocol？（）

单项选择题 Aserverwillnotpoweron.WhichofthefollowingdevicesshouldtheadministratoruseFIRSTto determinetheproblem？（）

单项选择题 An administrator is upgrading memory on the server. Once the server in turned back on， the administrator notices that the memory has not changed. The system board website says the board should accept the new amount of memory.  Which of the following should the administrator do FIRST？（）