单项选择题 Adatacenterdirectorimplementsanewsecuritymeasureinresponsetomultipleequipmentthefts fromthedatacenter.Thenewsecuritymeasurerequirespeopleenteringorleavingthedata center togothroughanextrasecurearea.Onceenteringtheareapeoplemustpresenttwoformsof authenticationtoleave.Whichofthefollowingsecuritymeasuresdoesthisdescribe？（）

单项选择题 An administrator needs to maintain 1TB of storage space for a server. A performance critical application will use this storage space for a database. The database will be replicated between multipleservers. Cost and performance are the most important considerations.  Which of the following RAID configurations would be the BEST choice for the storage array？（）

单项选择题 WhichofthefollowingshouldbedoneFIRSTwhentroubleshootingaproblem？（）