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Difficulty: HardResilience, High Availability, and Redundancy

A cloud security architect is designing a resilient infrastructure for a critical financial transaction service deployed across two geographically distant cloud regions. To satisfy business requirements, the architecture must achieve a Recovery Point Objective (RPO) of zero (zero data loss) and a Recovery Time Objective (RTO) of near-zero in the event of an entire regional failure. Which TWO of the following architectural mechanisms must be deployed together to meet these strict availability and resilience targets?

  1. Active-active multi-region application deployment utilizing synchronous database replication across regionsAnswer
  2. Global Server Load Balancing (GSLB) configured with real-time health monitoring and dynamic latency/failover routingAnswer
  3. C
    Automated 15-minute point-in-time database snapshot replication to immutable cloud storage in the secondary region
  4. D
    A cold standby secondary environment programmed to automatically provision infrastructure templates upon primary region alert

Answer

The correct architecture requires combining an active-active multi-region deployment utilizing synchronous database replication with Global Server Load Balancing (GSLB) featuring real-time health monitoring.
Achieving RPO = 0 (zero data loss) requires synchronous replication so that every write operation is committed in real time across geographically distributed database nodes. Achieving RTO = near-zero requires an active-active deployment supported by Global Server Load Balancing (GSLB), which continuously probes service health and instantly reroutes ingress traffic away from an impaired region to the surviving active region.

Step-by-Step Solution

1
Analyze RPO requirements for zero data loss
Identified that synchronous replication across active nodes is mandatory so that transactions are committed to both sites simultaneously prior to transaction confirmation.
Asynchronous replication or periodic snapshots allow data gaps between write intervals, failing the RPO = 0 mandate.
2
Analyze RTO requirements for near-zero downtime
Identified that active-active processing coupled with automated dynamic traffic distribution (GSLB) is necessary.
Both regions must actively process traffic or stand ready with live synchronized state so traffic rerouting occurs seamlessly without provisioning delays.
3
Evaluate and eliminate non-compliant disaster recovery approaches
Rejected point-in-time snapshots (causes data loss) and cold standby provisioning (causes service downtime).
Disaster recovery backups and cold sites are recovery controls, not continuous high-availability or zero-loss fault-tolerant controls.

Key Concept

High Availability, Synchronous Replication, and Global Load Balancing
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Topics

Resilience, High Availability, and Redundancy

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