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CISM study material · question 884 of 1000

How does NIST describe the two cost curves that determine an optimal recovery solution?

  1. Recovery cost falls as the recovery time objective shortens, because automation simply replaces the labour that a slower manual recovery would otherwise have needed
  2. Disruption cost is fixed whatever the length of the outage itself turns out to be, and only the cost of the recovery solution varies with the objective that has finally been chosen here
  3. Both of the two costs rise with the length of the outage, and the optimum sits at the point at which the higher of the two curves eventually begins to plateau
  4. Disruption cost rises with outage length while recovery-solution cost rises as the recovery time objective shortens; the optimum is where they cross
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Answer: D. Disruption cost rises with outage length while recovery-solution cost rises as the recovery time objective shortens; the optimum is where they cross

SP 800-34r1 describes the cost balancing point as the intersection of the curve for the cost of disruption, which increases with outage length, and the curve for the cost of recovery capabilities, which increases as the recovery time objective shortens.

Source: NIST SP 800-34 Rev. 1 (NIST) — Sec. 3.2.1 Cost Balancing

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