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The WidgetCo website has a MTD of 10 hours before profit loss becomes untenable so Management set a recovery time objective RTO of 10 hours. The WidgetCo website has a Server with a WRT of 2 hours, the server hard disks have a WRT of 1 hour, and the server networking equipment has a WRT of 6 hours. Assuming the three problems can be resolved in parallel, If WidgetCo has a failure of power which destroys the server, breaks a hard drive, and takes down the network all at once, will they be able to restore service in time to meet the MTD requirement?
Yes
No
You can't tell from this information.
MTD=RTO+WRT. Management forgot that the Recovery Time Objective RTO to reconfigure the system can only be completed after the Work Recovery Time WRT has been completed. RTO adds time to the WRT, it does not replace it. So using the longest WRT, we calculate a MTD of 10+6, 16 hours, which is longer than the requirement of 10 hours.
EDIT: Neither NIST SP 800-34 (Contingency Planning) nor ISC2 CISSP Official Study Guide Seventh Edition make any mention of Work Recovery Time. Both require RTO to be less than MTD.
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