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Difficulty: MediumDesigning Infrastructure for Technical Requirements and High Availability

A global gaming studio is architecting the cloud backend for a online multiplayer platform on Google Cloud. The architecture must maintain high availability with a target availability of 99.99%. The platform requires continuous high-throughput hybrid connectivity of 15 Gbps between on-premises data centers and GCP. Additionally, the web service tier must automatically scale to handle unpredictable traffic spikes without risking cascading failures from backend database health dependency checks. Which TWO architectural options should you select to meet these technical and availability requirements?

  1. Provision Dedicated Interconnect circuits with redundant VLAN attachments across two distinct edge availability domains.Answer
  2. B
    Establish HA Cloud VPN tunnels in an active-active routing configuration using BGP over public internet links.
  3. C
    Configure load balancer health checks to query deep diagnostic endpoints that validate end-to-end database connectivity and query execution.
  4. Configure load balancer health checks to query shallow HTTP endpoints dedicated strictly to assessing web instance web server process health.Answer
  5. E
    Configure backend autoscaling policies based exclusively on average CPU utilization targets across instance groups.

Answer

The correct architecture requires provisioning Dedicated Interconnect across two edge availability domains to satisfy the 15 Gbps throughput requirement at 99.99% SLA, and using shallow load balancer health checks targeting instance web server responsiveness to prevent cascading failures.
Dedicated Interconnect configured across two distinct edge availability domains provides the necessary physical bandwidth for 15 Gbps while satisfying Google Cloud's 99.99% SLA topology. Additionally, shallow health checks ensure load balancers accurately monitor web application availability without causing fleet-wide cascading dropouts caused by backend database congestion.

Step-by-Step Solution

1
Analyze bandwidth and SLA constraints for hybrid connectivity.
Requirements specify continuous 15 Gbps throughput and 99.99% availability. HA Cloud VPN per-tunnel limits (3 Gbps) are insufficient, making Dedicated Interconnect with dual edge availability domains mandatory.
Dedicated Interconnect is designed for high-capacity hybrid throughput (>3 Gbps per tunnel) with enterprise availability SLAs.
2
Evaluate load balancing health check strategy for service availability.
Selecting shallow health checks isolates instance health from backend database dependency degradation.
Deep health checks cause instances to be marked unhealthy when database latency surges, exacerbating outages by cycling healthy compute capacity.

Key Concept

High Availability Hybrid Connectivity and Resilient Load Balancer Health Checking
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Topics

Designing Infrastructure for Technical Requirements and High Availability