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Difficulty: EasyBusiness Continuity and Disaster Recovery

A network operations team is updating its disaster recovery plan documentation. How should the team arrange the following recovery site solutions in order from shortest Recovery Time Objective (RTO) to longest Recovery Time Objective (RTO)?

  1. 1Hot site with active-active server cluster and real-time data replication
  2. 2Warm site with pre-installed network hardware requiring current data backups to be restored
  3. 3Cold site with physical facility, power, and cooling, but no pre-configured network equipment

Answer

The correct order from shortest to longest RTO is: Hot site with active-active server cluster, followed by Warm site with pre-installed network hardware, and finally Cold site with physical facility only.
A hot site has live data and equipment ready for immediate takeover, providing the shortest RTO. A warm site has infrastructure staged but requires backup data to be restored, resulting in a moderate RTO. A cold site provides only basic environmental controls and space, requiring full hardware provisioning and setup, which results in the longest RTO.

Step-by-Step Solution

1
Determine which site model provides immediate operational readiness.
A hot site maintains active hardware and synchronized data, yielding the shortest RTO.
Near-instantaneous failover minimizes downtime.
2
Determine which site model has hardware installed but requires operational restoration.
A warm site has network equipment ready, but requires data restoration, making its RTO moderate.
Restoring data takes hours rather than minutes.
3
Determine which site model lacks operational networking equipment.
A cold site requires bringing in equipment, cabling, and configuring systems, leading to the longest RTO.
Full hardware setup and configuration takes days or weeks.

Key Concept

Disaster Recovery Site Selection and Recovery Time Objective (RTO)
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Topics

Business Continuity and Disaster Recovery

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