Business Continuity Planning

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These questions are derived from the Self Test Software Practice Test for (ISC)2’s CISSP exam Objective: Business Continuity Planning SubObjective: Restoration Single Answer, Multiple Choice Which term refers to the amount of time a company can tolerate the outage of a certain asset or entity?

  1. business impact analysis
  2. maximum tolerable downtime
  3. maximum recovery time
  4. mean time between failure
  5. mean time to repair

Answer: B. maximum tolerable downtime Tutorial: The maximum tolerable downtime (MTD) is the amount of time a company can tolerate the outage of a certain asset or entity. The MTD can range from a few minutes to a few hours for the most critical assets to 30 days, or more for nonessential assets. MTD is based on the criticality of the asset’s operations. Critical assets usually cannot be replaced using manual methods. For example, a Web server that provides e-commerce functions will probably be more critical than a file server that provides a storage facility for users’ files. A business impact analysis (BIA) identifies critical business operations and calculates the risk and threats those operations can incur. The maximum recovery time is an estimate of the maximum amount of time it will take to recover a system. This recovery usually includes recovering data backups. The mean time between failure (MTBF) is the estimated time a piece of equipment will last before it needs replacement. This is usually provided by the equipment vendor. The mean time to repair (MTTF) is the estimated time a piece of equipment will be down due to failure. A system is considered more reliable when it has a higher MTBF and lower MTTR. Reference: CISSP All-in-One Exam Guide, Chapter 9: Business Continuity Planning, Business Impact Analysis, pp. 699-703.

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