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Difficulty: MediumBusiness Continuity and Disaster Recovery

A network engineering team is designing a disaster recovery architecture for a multi-tier financial portal. The business impact analysis mandates a Recovery Point Objective (RPO) of near-zero seconds for transactional data and a Recovery Time Objective (RTO) of under 2 hours for all network services. Which TWO of the following technical controls must be combined to satisfy these operational requirements?

  1. Implementation of real-time synchronous database replication across geographically distinct data centersAnswer
  2. Deployment of an active-hot recovery site with pre-configured infrastructure and automated global server load balancingAnswer
  3. C
    Execution of hourly incremental backups coupled with night-time full system snapshots stored offsite
  4. D
    Maintenance of a cold site equipped with space and power contracts for rapid hardware delivery
  5. E
    Daily differential backups combined with weekly full bare-metal server images

Answer

The correct controls are real-time synchronous database replication across data centers and the deployment of an active-hot recovery site with automated global server load balancing.
To satisfy a near-zero RPO, data must be replicated immediately as transactions occur, which requires synchronous replication. To satisfy an RTO of under 2 hours, network infrastructure must already be live and synchronized in a hot site configuration with automatic global load balancing to redirect user sessions instantly.

Step-by-Step Solution

1
Analyze the RPO requirement
Near-zero seconds RPO means no data loss can occur during a failover event.
Asynchronous or scheduled backups (such as hourly or daily backups) leave a window where un-backed-up data will be lost. Synchronous replication ensures data is committed to both locations simultaneously before acknowledging transaction completion.
2
Analyze the RTO requirement
RTO under 2 hours requires rapid infrastructure availability and traffic redirection.
Cold or warm sites require extended operational ramp-up times (procuring hardware, restoring images, mounting tape backups). An active-hot site maintains mirrored hardware and live networking assets, enabling automated GSLB failover well within the 2-hour window.

Key Concept

RTO and RPO Alignment with Site Selection and Replication Mechanisms
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Topics

Business Continuity and Disaster Recovery

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