单项选择题
A. Replacing the CAT5 cables with CAT6 cables
B. Replacing traditional racks with water cooled racks
C. Turning off non-critical application servers during non-business hours
D. Taking the second power supplys out of non-critical servers
多项选择题 Which of the following is designed to guarantee that once data is written it cannot be modified?（）
单项选择题 Which of the following describes how to calculate the amount of storage in a RAID 5 array?（）
单项选择题 A server was recently updated with the latest antivirus definitions. Immediately after the update,the server begins to report file not found? errors for a mission critical application. Which of the following is the MOST likely reason for this?（）