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QuestionQ67

Designing and planning a cloud solution architecture

A retail company’s most critical application is its online payment-processing system. The business requires that the system survive a complete zonal outage while minimizing cost. You need a design that can handle a zonal failure. What should you do?

  • A Deploy the application in an active-active configuration using managed instance groups (MIGs) in two different regions, fronted by a global external HTTP(S) Load Balancer and backed by a multi-regional database like Spanner.
  • B Deploy the application on a regional MIG to provide high availability across multiple zones in the primary region.
  • C Configure the regional MIG to use only Spot VMs to aggressively minimize operational costs while maintaining high availability.
  • D Deploy the application on Compute Engine instances across multiple regions, and rely on daily snapshots for recovery to achieve the lowest possible cost.
Explanation

A regional managed instance group distributes application instances across multiple zones in the same region, protecting the workload from a zonal failure because instances in the remaining zones can continue serving traffic. This provides the required zonal resilience without the additional cost and complexity of an active-active multi-region architecture.

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