多项选择题
A. A device transfers data directly to the memory.
B. A device handles mediation between the northbridge and the processor.
C. A device connects to another device without involving the processor.
D. A device transfers data to the processor and then on to the memory.
E. A device handles mediation between the southbridge and the processor
单项选择题 Whichofthefollowingprotocolswouldbeusedtotestifonehostisreachablebyanotherhost，by sendingechorequestsandwaitingforechoreplies？（）
单项选择题 AsmallpushbuttontypicallyfoundontheinsideofaservercaseisMOSTlikelyusedforwhichof thefollowingpurposes？（）
单项选择题 Which of the following will allow devices to be added without turning the server off?（）