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CISSP · Question #1315

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 shoul

The correct answer is A. Application. Tier 4 data centers provide fault-tolerant infrastructure with redundant power, cooling, and network, so infrastructure-level failures are mitigated by design, leaving application-layer failures as the primary BCP concern.

Submitted by asante_acc· Mar 5, 2026Security and Risk Management

Question

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 should the IT manager be concerned with?

Options

  • AApplication
  • BStorage
  • CPower
  • DNetwork

How the community answered

(32 responses)
  • A
    69% (22)
  • B
    6% (2)
  • C
    19% (6)
  • D
    6% (2)

Why each option

Tier 4 data centers provide fault-tolerant infrastructure with redundant power, cooling, and network, so infrastructure-level failures are mitigated by design, leaving application-layer failures as the primary BCP concern.

AApplicationCorrect

Tier 4 data centers (as defined by the Uptime Institute) provide fully fault-tolerant systems with 99.995% uptime, including redundant power feeds, cooling, and network paths, meaning physical infrastructure failures are engineered out. Application failures-such as software bugs, misconfigurations, or logical errors-are not addressed by data center tier ratings and therefore remain a legitimate BCP concern that the IT manager must plan for.

BStorage

Tier 4 data centers include redundant storage paths and fault-tolerant infrastructure, so storage-level failures are mitigated by the facility's design and are not a primary BCP concern.

CPower

Tier 4 data centers require at least two independent power distribution paths and have enough capacity to tolerate any single failure, making power outages a non-issue at this tier.

DNetwork

Tier 4 data centers include fully redundant network infrastructure with multiple diverse paths, so network failures are addressed by the physical facility design and are not a primary BCP concern.

Concept tested: Tier 4 data center fault tolerance and BCP scope

Source: https://uptimeinstitute.com/tiers

Topics

#Business Continuity Planning (BCP)#data center tiers#application availability#redundancy

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