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Difficulty: MediumBusiness Continuity and Disaster Recovery

A network engineering team is updating the disaster recovery policy for a critical real-time payment processing application. The Business Impact Analysis (BIA) establishes a Recovery Point Objective (RPO) of less than 5 minutes and a Recovery Time Objective (RTO) of less than 15 minutes. Which TWO of the following technical solutions should the team implement to meet both requirements?

  1. Synchronous database replication across an active-active high-availability clusterAnswer
  2. Automated traffic redirection utilizing Global Server Load Balancing (GSLB) with continuous health checksAnswer
  3. C
    Nightly differential backups paired with weekly full backups shipped to a secure off-site cold facility
  4. D
    An on-demand warm site initialized via manual provisioning scripts upon disaster declaration
  5. E
    Hourly incremental backups copied over an IPsec tunnel to a local Network-Attached Storage (NAS) array

Answer

The team must implement synchronous database replication across an active-active high-availability cluster and automated traffic redirection utilizing Global Server Load Balancing (GSLB) with continuous health checks.
Synchronous database replication ensures that transactions are committed to the secondary site in real time before completion, meeting the 5-minute RPO threshold. Automated GSLB health monitoring and traffic shifting immediately reroute production traffic to the active secondary site upon failure detection, fulfilling the sub-15-minute RTO requirement.

Step-by-Step Solution

1
Analyze the RPO requirement (RPO<5 minutesRPO < 5\text{ minutes}) to determine data duplication strategy.
Near-zero data loss is mandatory. Asynchronous or interval-based backups (hourly or nightly) create windows of potential data loss far exceeding 5 minutes. Synchronous replication ensures zero to minimal data loss by writing transactions simultaneously to both locations.
RPO defines the maximum acceptable age of unrecovered data during a disruption.
2
Analyze the RTO requirement (RTO<15 minutesRTO < 15\text{ minutes}) to determine site availability and failover mechanism.
Service restoration must occur within 15 minutes. Cold or warm sites requiring manual declaration, provisioning, or DNS manual record updates take hours. Automated GSLB failover continuously monitors endpoint health and redirects active traffic automatically in real time.
RTO defines the maximum acceptable duration of service downtime.

Key Concept

Disaster Recovery Metrics (RTO and RPO) and Site Redundancy Strategies
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Topics

Business Continuity and Disaster Recovery

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