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Difficulty: HardResilience, High Availability, and Redundancy

An organization is configuring a geographically separated secondary data center to maintain continuous operations for its mission-critical transactional database. The business requirement dictates a Recovery Point Objective (RPO) of zero and automatic failover without human intervention in the event of an site outage. Which of the following technical design choices and infrastructure components must be implemented to fulfill these specific requirements? (Select TWO.)

  1. Synchronous database replication across both sitesAnswer
  2. Dynamic Global Server Load Balancing (GSLB) with automated health probes and low TTL DNS recordsAnswer
  3. C
    Daily asynchronous storage snapshots backed up to air-gapped cloud storage
  4. D
    Warm site infrastructure configured with manual DNS record update playbooks

Answer

The necessary technical controls are synchronous database replication and dynamic Global Server Load Balancing (GSLB) with automated health probes.
To achieve RPO = 0, data must be written simultaneously to both locations via synchronous replication. To achieve automated failover, GSLB with continuous health checks automatically updates routing paths when the primary endpoint fails to respond.

Step-by-Step Solution

1
Analyze RPO requirements
An RPO of zero requires synchronous replication so that transactions are committed simultaneously at both sites without data lag.
Asynchronous methods incur latency gaps resulting in lost data during an unannounced failure.
2
Analyze automated failover requirements
Automated failover requires GSLB with health monitoring to dynamically detect primary site degradation and redirect user traffic seamlessly.
Manual DNS playbooks introduce human delay and extend recovery time beyond high availability bounds.

Key Concept

High Availability and Active-Active Site Replication
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Topics

Resilience, High Availability, and Redundancy

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