AWS Certified Solutions Architect Professional SAP-C02 Practice Question
A multinational financial-services corporation runs a latency-sensitive trading platform on AWS. The workload is deployed in the us-east-1 Region on an Amazon Aurora PostgreSQL cluster with reader instances in multiple Availability Zones. To improve business continuity, the company must survive a complete Regional outage with:
Recovery Time Objective (RTO) less than 15 minutes
Recovery Point Objective (RPO) near zero
Better response time for its rapidly growing European customer base.
Which disaster-recovery strategy best meets these requirements?
Deploy a warm standby in the eu-west-1 Region. Convert the database to an Amazon Aurora PostgreSQL cluster and create an Aurora Global Database with eu-west-1 as a secondary cluster. Use Amazon Route 53 health checks and failover routing to redirect traffic.
Establish a pilot-light environment in the us-west-2 Region with asynchronous database replication. Scale up the resources there only if the primary Region fails.
Provision a fully redundant set of resources in another Availability Zone within us-east-1 and use a load balancer to fail over if the primary AZ fails.
Enable cross-Region automated backups and snapshot copying to the us-west-2 Region. Use AWS CloudFormation to rebuild the environment from these backups during a disaster.
Creating a warm standby of the entire stack in the eu-west-1 Region and extending the Aurora PostgreSQL cluster with Aurora Global Database meets all objectives. Aurora Global Database uses dedicated storage-level, asynchronous replication that typically delivers sub-second RPO and allows promotion of a secondary Region to read/write in under a minute, keeping total recovery time well below 15 minutes. Because the secondary cluster can serve read traffic, routing European users to eu-west-1 reduces latency. Route 53 health checks with failover routing (or Route 53 ARC) can automatically redirect traffic if the primary Region becomes unavailable.
Cross-Region snapshots constitute a backup-and-restore pattern with RTO measured in hours and RPO determined by snapshot frequency, so they don't satisfy the stated objectives.
Adding resources only in another Availability Zone within us-east-1 protects against an AZ failure but not a Regional outage.
A pilot-light environment in us-west-2 could meet the RTO/RPO goals but would not reduce latency for European users.
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