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Difficulty: HardReliability, Predictability, and Disaster Recovery

An online educational testing service hosts its examination platform on Microsoft Azure. The organization has two requirements for its deployment:

* The system must deliver consistent user response times and maintain stable, forecastable operational costs during standard testing windows.
* The platform must be able to restore operations in a different geographical region within a specified recovery time objective (RTO) if the primary Azure region suffers a catastrophic event.

Which cloud concepts address these requirements?

  1. Predictability and disaster recoveryAnswer
  2. B
    Predictability and high availability
  3. C
    Elasticity and disaster recovery
  4. D
    Zone-redundant high availability and predictability

Answer

Predictability and disaster recovery
The requirement for consistent response times and forecastable operational costs is addressed by predictability. The requirement to restore operations in a different region after a catastrophic regional outage is addressed by disaster recovery.

Step-by-Step Solution

1
Analyze the first requirement: consistent user response times and stable, forecastable operational costs during standard testing windows.
Identify that performance stability and cost forecastability are core pillars of predictability in cloud computing.
Predictability ensures that both resource costs and application performance can be anticipated and remain consistent under expected workloads.
2
Analyze the second requirement: the ability to restore operations in a different geographical region within a specified RTO during a catastrophic outage.
Identify that recovering from region-wide catastrophic failures by failing over to another region is disaster recovery.
Disaster recovery plans and technologies (like geo-replication and backup restoration) focus on business continuity when an entire primary region becomes unavailable.
3
Combine the identified concepts and evaluate the options.
The correct combination is predictability and disaster recovery.
High availability maintains uptime within a region but does not recover from regional disasters, and elasticity scales resources dynamically rather than keeping performance and costs stable.

Key Concept

Reliability, Predictability, and Disaster Recovery
Estimated Time:2m 0s
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Topics

Reliability, Predictability, and Disaster Recovery

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