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Difficulty: HardDesigning Infrastructure for Technical Requirements and High Availability

A global supply chain enterprise is migrating its core order-processing platform to Google Cloud. The system must support strong transactional consistency with a Recovery Point Objective (RPO) of 0 and a Recovery Time Objective (RTO) of under 5 seconds in the event of a total regional outage. Furthermore, the architecture requires a dedicated, private hybrid network connection between the corporate data center and Google Cloud that supports 15 Gbps of sustained bandwidth while meeting a 99.99% availability SLA. Which TWO architectural components should you include in your design to satisfy these requirements?

  1. Deploy a multi-region Cloud Spanner instance configured across North American regions to handle transactional workloads synchronously.Answer
  2. Provision dual 10 Gbps Dedicated Interconnect circuits terminating at two distinct Google Cloud edge facilities in separate metro locations.Answer
  3. C
    Deploy a Cloud SQL for PostgreSQL instance with regional High Availability (HA) and asynchronous cross-region read replicas configured for failover.
  4. D
    Configure an HA VPN gateway with six active IPsec tunnels using Cloud Routers to aggregate bandwidth for the hybrid connectivity requirement.
  5. E
    Establish VPC Network Peering between a central transit VPC and spoke application VPCs to transitively route traffic from on-premises Interconnect attachments.

Answer

To meet zero RPO and sub-5-second RTO multi-region availability, deploy a multi-region Cloud Spanner instance. To deliver 15 Gbps sustained hybrid throughput with a 99.99% availability SLA, establish dual Dedicated Interconnect circuits across two distinct metro locations.
Deploying a multi-region Cloud Spanner instance guarantees synchronous multi-region writes via Paxos consensus, providing RPO=0 and automatic failover in under 5 seconds during a regional outage. Deploying dual 10 Gbps Dedicated Interconnect circuits across two separate metro locations satisfies the 15 Gbps sustained bandwidth requirement while meeting Google's explicit architectural blueprint for a 99.99% SLA.

Step-by-Step Solution

1
Analyze database requirements for high availability and disaster recovery
Identified the need for synchronous multi-region replication providing RPO=0 and automatic sub-second failover.
Cloud SQL cross-region replicas replicate asynchronously (RPO > 0), whereas multi-region Cloud Spanner uses Paxos for synchronous cross-region commit and instant failover.
2
Evaluate hybrid networking options for throughput and availability SLA
Determined Dedicated Interconnect with 99.99% topology is required.
HA VPN tunnels are capped at 3 Gbps each and do not scale cleanly to 15 Gbps. Dedicated Interconnect provides 10 Gbps/100 Gbps pipes and guarantees a 99.99% SLA when redundantly configured across two metro locations.
3
Validate network routing constraints
Rejected transitive VPC peering design.
VPC Peering does not forward traffic from external hybrid connections transitively across peered networks.

Key Concept

Multi-Region Relational Availability and High-SLA Enterprise Hybrid Network Topology Design
Estimated Time:2m 0s
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Topics

Designing Infrastructure for Technical Requirements and High Availability