SY0-501 Question #333: Real Exam Question with Answer & Explanation

Question

An organization's primary datacenter is experiencing a two-day outage due to an HVAC malfunction. The node located in the datacenter has lost power and is no longer operational, impacting the ability of all users to connect to the alternate datacenter. Which of the following BIA concepts BEST represents the risk described in this scenario?

Options

• ASPoF
• BRTO
• CMTBF
• DMTTR

Explanation

The scenario describes a situation where the failure of a single node in a primary datacenter unexpectedly prevents all users from connecting to an alternate datacenter, indicating a critical vulnerability in the system's design. This risk, where one component's failure causes the entire system to fail despite redundancy, is best represented as a Single Point of Failure (SPoF).

Common mistakes.

• B. Recovery Time Objective (RTO) is a target metric defining the maximum acceptable duration of downtime for a business process after an incident, not the specific architectural design flaw that led to the widespread failure.
• C. Mean Time Between Failures (MTBF) is a reliability metric indicating the average time a system operates before experiencing a failure, which is distinct from identifying an architectural vulnerability like a single point of failure.
• D. Mean Time To Recover (MTTR) is a metric for the average time required to repair a failed component or system and restore it to full functionality, rather than the underlying design weakness that caused the initial critical outage.

Concept tested. Identifying single points of failure in IT architecture

Reference. https://learn.microsoft.com/en-us/azure/architecture/guide/design-principles/resiliency#eliminate-single-points-of-failure

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