Examkin

Question

Difficulty: Very hardBusiness Continuity and Disaster Recovery

An enterprise organization requires a disaster recovery strategy for its mission-critical database cluster across dual data centers separated by 120 km. The business demands a Recovery Point Objective (RPO) of absolute zero data loss and a Recovery Time Objective (RTO) under 5 minutes. Which of the following technical controls and redundancy configurations MUST be combined to satisfy these stringent business continuity metrics? (Select TWO)

  1. Synchronous storage block-level replication between active-active multi-site cluster nodesAnswer
  2. Continuous Data Protection (CDP) paired with automated BGP route advertisement or DNS failover triggersAnswer
  3. C
    Asynchronous database log shipping combined with manual administrator failover scripts
  4. D
    Hourly incremental backups combined with weekly full backups retained on cloud object storage
  5. E
    Daily differential backups layered over full Sunday image captures sent to a remote cold site

Answer

Meeting an RPO of zero requires synchronous replication or Continuous Data Protection (CDP) so no committed transaction is lost. Achieving an RTO under 5 minutes necessitates automated active-active cluster failover or dynamic BGP/DNS redirection without manual intervention.
Synchronous block-level storage replication and Continuous Data Protection (CDP) ensure every transaction is committed at the remote site before completion, guaranteeing zero data loss (RPO = 0). Pairing these with automated failover mechanisms such as active-active clustering or dynamic BGP/DNS updates enables service restoration within minutes, meeting the RTO threshold.

Step-by-Step Solution

1
Analyze RPO requirements
RPO = 0 mandates real-time write confirmation across sites (synchronous replication or Continuous Data Protection). Asynchronous, log shipping, and periodic backup schedules all introduce potential data loss windows.
Periodic or asynchronous operations allow data modifications to exist exclusively at the primary site prior to replication.
2
Analyze RTO requirements
RTO < 5 minutes requires fully automated failover mechanisms (active-active clustering or automated network route/DNS redirection).
Manual intervention, restoring backup files, or provisioning cold site infrastructure exceeds the 5-minute threshold.
3
Select matching technologies
Synchronous block replication with active-active clustering and CDP with automated network redirection satisfy both RPO=0 and RTO < 5 min.
Both selected technologies provide real-time data persistence and automated failover.

Key Concept

RPO and RTO Trade-off Analysis in High Availability and Disaster Recovery Design
Rate this question

Topics

Business Continuity and Disaster Recovery

More questions from this topic