AWS Certified Solutions Architect Associate SAA-C03 Practice Question
A financial services firm has applications that are crucial for its day-to-day operations. This firm cannot afford a downtime of more than 2 hours and must ensure data is not lost beyond a 5-minute interval in case of a system failure. The current deployment spans across several fault-tolerant zones within a single region. Which disaster recovery approach should be recommended to meet the firm's stringent continuity needs?
Adopting a strategy where crucial parts of the system are always ready to be activated in a geographically separate region.
Periodic data backups to a durable storage service with cross-region replication capabilities, allowing for restoration in a different geographic area if needed.
Arranging a scaled-down, on-demand version of the application stack in another region, which can be brought online in response to disruptions.
Formulating an active-active topology distributed over several geographical regions with traffic management to control workload distribution.
An active-active topology, involving deployment over geographically distinct regions with both sites in full operation and sharing the traffic load, ensures an immediate failover with minimal data loss. It accommodates an RTO close to zero and supports an RPO of a few minutes due to continuous data synchronization. Relying on read replicas or standby layouts could introduce delays exceeding the required RTO and RPO in the situation described. Snapshots provide point-in-time backups but do not offer the real-time data replication or instant switch-over needed.
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