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Following power management, you learned that the most critical component of a fault tolerance plan is the amount and type of disk fault tolerance implemented. Types of disk fault tolerance include RAID in its various forms. Additionally, you learned about the different methods of backup and how they apply to disaster recovery.

You also learned how important virus protection is to a network, and that if antivirus measures are in place, fault tolerance and disaster recovery are not needed. Viruses are small programs that can interrupt the normal function of a computer. Viruses can spread on a network like wildfire and must be eliminated before they have a chance to spread and cause damage.

Finally, you learned that, in order to keep systems running with the least amount of problems, a software patch must occasionally be applied. A software patch is a piece of software that temporarily fixes small problems within an existing program until the next major release of the software.

Exam Essentials

Explain when to implement fault tolerance. Fault tolerance and disaster recovery must be implemented at some point and to some level on every network. Fault tolerance provides a means by which a computer or network has redundancy or the ability to recover from small faults and to continue providing services during the fault.

Explain when to implement disaster recovery. Disaster recovery typically means a way of recovering after a major disaster, typically by backing up data on a regular basis, so that critical data is not lost.

Know what a full backup is, and explain the differences between the full, incremental, and differential backups. Each backup type differs primarily in the amount backed up and whether the items being backed up have changed. Full backups typically back up the entire contents of a server, whether they’ve changed or not.

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