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GCP Professional Cloud Architect Practice Question

Your company's customer-facing web app runs in a regional managed instance group (MIG) in us-central1 behind a global external HTTP(S) load balancer. It stores transactions in a regional Cloud SQL for MySQL instance with HA in the same region. The BCP now demands recovery within 5 minutes and ≤15 minutes data loss if the entire us-central1 region goes down. Budgets forbid major re-platforming. Which architecture most cost-effectively meets these RTO/RPO targets?

  • Store transaction data in a multi-region Cloud Storage bucket served through Cloud CDN, keep the Compute Engine MIG in us-central1, and use Cloud Functions to recreate instances if the region fails.

  • Provision an additional multi-zonal MIG in us-east1, add it to the existing global HTTP(S) load balancer, create a cross-region Cloud SQL read replica in us-east1, and automate promotion of the replica and database connection failover when us-central1 becomes unreachable.

  • Replace Cloud SQL with a multi-region Cloud Spanner instance, move the application to Cloud Run with multi-region deployment, and configure Serverless NEGs behind the existing load balancer.

  • Convert the current MIG to a regional MIG, enable Cloud SQL automatic failover zones, and rely on the global load balancer's health checks to shift traffic among zones within us-central1.

GCP Professional Cloud Architect
Designing and planning a cloud solution architecture
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