DOP-C02 practice question: DR strategies, AWS Backup and RTO/RPO (1 of 3)
Resilient Cloud Solutions A free question from our original DOP-C02 practice exam. Try it, then open the answer to see why each option is right or wrong.
An insurance firm runs its claims platform in one Region. The platform uses an Auto Scaling fleet of EC2 instances, an Aurora cluster and an Application Load Balancer, and the firm has set a recovery time objective of 15 minutes and a recovery point objective of about five minutes.
The firm needs a second Region that already holds replicated data and has the application stack defined and deployable. During a regional event, a reduced-capacity copy of the platform must start serving claims traffic within five minutes, and the rest of the fleet must scale up to full capacity within the 15-minute objective.
The firm wants the lowest cost that still meets these targets, and it wants no human approval in the failover path.
Which DR strategy meets these requirements?
Choose one answer.
AA. Backup and restore, with nightly AWS Backup copies to the second Region and an infrastructure template that the team runs after a regional outage to rebuild the platform.
BB. Pilot light, with the Aurora data replicated continuously to the second Region and only the database running there, and the Auto Scaling fleet and load balancer created during a failover.
CC. Multi-site active-active, with full copies of the fleet running in both Regions and traffic split across them, so that either Region can absorb the whole load immediately.
DD. Warm standby, with a scaled-down but running copy of the fleet and load balancer in the second Region, Aurora replicated there, and automatic scale-out during a failover.
D. Right: Correct. The reduced-capacity copy already serves traffic, so the five-minute target can be met, and automatic scaling brings the rest of the fleet up within the 15-minute objective. Continuous replication keeps the data within the recovery point. Learn more: Disaster recovery options in the cloud (opens in a new tab)
Explanation
A warm standby keeps a scaled-down copy of the serving stack running in the second Region, with continuous data replication, so a failover can serve reduced traffic within minutes and scale up within the recovery time objective. Backup and restore and pilot light start too late for the serving tier, and active-active costs more than the firm wants.
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