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Difficulty: HardBusiness Continuity and Disaster Recovery

An enterprise network architect is designing a business continuity and disaster recovery strategy for a mission-critical transaction platform. The Business Impact Analysis (BIA) specifies a Maximum Tolerable Downtime (MTD) of 4 hours and a Recovery Point Objective (RPO) of 15 minutes. High capital expenditure constraints prevent deploying an active-active, fully mirrored secondary data center. Which TWO of the following technical controls should be implemented to satisfy both the recovery objectives and operational constraints? (Select TWO.)

  1. Deploying a warm recovery site equipped with pre-provisioned core networking equipment and server hardware capable of being brought online within 2 hoursAnswer
  2. Configuring asynchronous block-level storage replication across a dedicated WAN link scheduled at 10-minute intervalsAnswer
  3. C
    Establishing a cold site contract providing physical data center floor space, power, and cooling, with hardware to be ordered upon disaster declaration
  4. D
    Scheduling daily differential backups transferred across the network every night at midnight to capture system changes
  5. E
    Configuring host default gateways to point directly to a single static physical interface IP on the primary router without virtual gateway redundancy

Answer

The optimal solution pairs a warm recovery site ready within 2 hours with asynchronous storage replication scheduled at 10-minute intervals to satisfy both the 4-hour recovery time and 15-minute data loss constraints.
Deploying a warm recovery site pre-stocked with essential hardware allows systems to become operational within 2 hours, well within the 4-hour Maximum Tolerable Downtime without the excessive cost of an active-active hot site. Asynchronous storage replication at 10-minute intervals ensures that no more than 10 minutes of transaction data is lost during a disruption, successfully satisfying the 15-minute Recovery Point Objective.

Step-by-Step Solution

1
Evaluate the Maximum Tolerable Downtime (MTD) of 4 hours against recovery site operational readiness models.
A warm site provides pre-installed infrastructure capable of launching within 2 hours, comfortably meeting the 4-hour limit while avoiding the budget impact of a mirrored active-active site. A cold site takes days to procure equipment.
Recovery site readiness must align with RTO and MTD parameters while observing capital expenditure boundaries.
2
Evaluate the Recovery Point Objective (RPO) target of 15 minutes against backup and replication mechanisms.
Asynchronous block-level replication scheduled every 10 minutes limits maximum potential data loss to 10 minutes, satisfying the 15-minute target. Daily differential backups risk up to 24 hours of data loss.
Replication intervals must be equal to or shorter than the specified RPO window.
3
Verify network gateway high-availability design integrity.
Network hosts must utilize redundant virtual gateway IP addressing (FHRP) rather than single physical interface addresses to ensure traffic can re-route automatically during failover.
Static physical interface configurations introduce single points of failure that obstruct failover execution.

Key Concept

Disaster Recovery Planning: Aligning RTO/RPO Metrics with Recovery Site Selection and Data Replication Controls
Estimated Time:2m 30s
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Topics

Business Continuity and Disaster Recovery

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