A company whose Information Technology (IT) services are being delivered from a Tier 4 data center, is preparing a companywide Business Continuity Planning (BCP). Which of the following failures…

Question

Options

• AApplication
• BStorage
• CPower
• DNetwork

• A
  7% (3)
• B
  4% (2)
• C
  78% (35)
• D
  11% (5)

Explanation

Power remains the foundational dependency for all data center operations - even in a Tier 4 facility with 2N+1 redundant UPS systems and backup generators, an extended utility outage can exhaust generator fuel, taking down every other system with it. Tier 4 specifically guarantees redundant, fault-tolerant paths for network (D) and storage (B), making those failures highly unlikely and thus not primary BCP concerns at this tier. Application (A) failures are a software-layer concern managed through clustering and load balancing, not a data center infrastructure risk that BCP at the facility level addresses. Power is uniquely dangerous because it sits beneath all other systems - network, storage, and applications all die if power dies, making it the one failure mode that cascades completely.

Memory tip: Use the hierarchy rule - Power → Network → Storage → Application. In BCP, focus on whatever sits at the bottom of the dependency chain; everything above it inherits the risk. At a Tier 4 center, all the higher-level redundancy is meaningless without sustained power.

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