GCP Professional Cloud Architect Practice Question

Your organization is launching a public e-commerce site on Compute Engine. Business leadership mandates that customer transactions must continue during a complete regional outage. Objectives are: RTO 15 minutes, RPO ≤ 1 minute for the relational order database, and at least 99.95% availability for the web tier, with minimal manual operations and controlled cost. Which design best meets these requirements?

Place stateless frontend instances in regional MIGs in two regions behind a global external HTTP(S) load balancer. Run Cloud SQL HA in the first region with a cross-region read replica and use a Cloud Function triggered by Cloud Monitoring to promote the replica and update connections on failure.
Use a single-region GKE cluster for the application and store data in Filestore, taking scheduled snapshots that are copied to another region for disaster recovery.
Run the entire application in a single zonal MIG and use a single-instance Cloud SQL database with automated daily backups and weekly export snapshots to Cloud Storage.
Migrate the database to a multi-region Cloud Spanner instance and keep the web tier on Cloud Run in one region behind a regional internal load balancer.

Report Issue

Answer Description

The combination of regional managed instance groups (MIGs) in two regions behind the global external HTTP(S) load balancer provides automatic traffic failover and meets the 99.95 % availability goal without requiring active management. A Cloud SQL high-availability (HA) primary keeps data safe within the first region, while an asynchronous cross-region read replica keeps the second region within seconds of the primary, satisfying the ≤ 1-minute RPO. Promotion of the replica, automated by a Cloud Function that is triggered when Cloud Monitoring detects primary failure, keeps the database RTO well under 15 minutes. The other options fall short: a single-zone deployment forms a single point of failure, Filestore snapshots cannot meet a 1-minute RPO, and moving only the database to multi-region Cloud Spanner still leaves the single-region web tier as a regional SPOF and would introduce higher cost and potential code changes.

Ask Bash

Bash is our AI bot, trained to help you pass your exam. AI Generated Content may display inaccurate information, always double-check anything important.