ISC2 Certified Cloud Security Professional (CCSP) Practice Question
A SaaS provider runs its customer-facing ERP application on virtual machines spread across a single public cloud region. A recent business impact analysis set a recovery time objective (RTO) of 4 hours and a recovery point objective (RPO) of 15 minutes. Budget constraints rule out fully active-active operation, but management wants a solution consistent with ITIL service continuity management guidance. Which resiliency design best meets these requirements while keeping costs moderate?
Deploy a warm standby environment in a second region with asynchronous database replication every five minutes, scaling up resources only during a failover.
Maintain a pilot-light instance in another availability zone, replicating data once per day and automating infrastructure build on demand.
Implement an active-active multi-region deployment with synchronous data replication and global load balancing across sites.
Rely on a cold standby site that is provisioned from weekly full backups stored in object storage.
A warm standby architecture keeps a scaled-down but fully functional copy of the production environment in a secondary region and uses frequent (for example, 5-minute) asynchronous data replication. If the primary region fails, the standby can be scaled up and made active well within a four-hour RTO, and the 15-minute RPO is satisfied by the near-real-time replication. Backup-and-restore or pilot-light patterns rely on daily or weekly backups, so their RPOs exceed 15 minutes and their RTOs are often longer than four hours. A fully active-active multi-region deployment would meet or exceed the objectives but typically costs substantially more than a warm standby and was specifically ruled out by management.
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ISC2 Certified Cloud Security Professional (CCSP)
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