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CISSP Cert Guide, Third Edition by Robin Abernathy, Sari Greene, Troy McMillan

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Appendix BMemory Tables Answer Key

Chapter 1

As part of determining how critical an asset is, you need to understand the following terms:

  • Maximum tolerable downtime (MTD): The maximum amount of time that an organization can tolerate a single resource or function being down. This is also referred to as maximum period time of disruption (MPTD).

  • Mean time to repair (MTTR): The average time required to repair a single failed component or device when a disaster or disruption occurs.

  • Mean time between failure (MTBF): The estimated amount of time a device will operate before a failure occurs. This amount is calculated by the device vendor. System reliability is increased by a higher MTBF and lower MTTR.

  • Recovery time objective (RTO): The time period ...

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