单项选择题
A. A way to catalog tapes after a tape backup to easily identify and retrieve data.
B. A modular tape backup system containing multiple drives， tapes， and connections.
C. A database consisting of all backups performed and the contents of each backup.
D. An offsite storage facility to house tapes in case of a disaster for easy site recovery.
单项选择题 TheprimarypurposeofanSLAbetweentheserviceproviderandcustomeristoagreeonwhichof thefollowing？（）
单项选择题 WhichofthefollowingisadisadvantageofRAID10？（）
单项选择题 An administrator replaces the network card in a web server. After replacing the network card some users can access the server but others cannot. Which of the following is the FIRST thing the administrator should check?（）