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4.    C. Backup systems are designed to provide a backup copy of existing data in case of system failure. These copies are typically stored on magnetic tape or some other kind of removable media.

5.    A. RAID 0 is where you use multiple disks as a single volume and the data is striped across all drives. This RAID level gives you increased performance, but doesn’t provide any increased reliability.

6.    D. RAID level 1 is more commonly known as mirroring, or duplexing. Mirroring is where you have two disks of the same size and data is written to both disks at once. If one fails, the other is available to service disk requests.

7.    C. Although five or more disks are commonly used, the minimum number of hard-disk drives needed for a RAID level 5 configuration is three.

8.    B, E. By definition, the major differences between disk duplexing and mirroring are that in a duplex configuration, the disks are mirrored, but each disk has its own disk controller adapter card installed in the computer. The reason for this is that in a mirrored configuration, if a disk controller fails, both mirrored disks are lost. Duplexing provides an extra level of protection.

9. C. RAID 1 provides fault tolerance, does not require reformatting of used portions of the drive, and, in this case, does not require the purchase of additional hard drives.

10.    B. An Uninterruptible Power Supply (UPS) provides the most power protection and management features of those listed. It should be connected to every server to protect the server from power problems.

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