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Difficulty: MediumCIA Triad & Core Security Concepts

A network engineer installs dual redundant power distribution units (PDUs) and configures a dynamic link aggregation group (LAG) across two physically separate switch stacks for an enterprise storage cluster. Which core pillar of the CIA triad does this redundant architecture primarily support?

  1. AvailabilityAnswer
  2. B
    Confidentiality
  3. C
    Integrity
  4. D
    Non-repudiation

Answer

Availability is the pillar of the CIA triad being directly supported, as redundant PDUs and link aggregation maintain access and eliminate single points of failure.
The core purpose of deploying redundant power sources (dual PDUs) and resilient multi-switch link aggregation (LAG) is fault tolerance. These controls eliminate single points of failure to guarantee that network services and storage remain continuously accessible to authorized users, which directly fulfills the Availability pillar of the CIA triad.

Step-by-Step Solution

1
Analyze the technical controls described in the scenario.
Dual PDUs provide power redundancy, while dynamic link aggregation across switch stacks provides network connection redundancy.
Identifying the purpose of hardware and connection redundancy is necessary to map controls to security principles.
2
Map the technical controls to the core security pillars.
Preventing single points of failure ensures uninterrupted uptime and fault tolerance for legitimate access.
Protecting against unexpected service failure or system downtime directly fulfills the objective of Availability.

Key Concept

CIA Triad - Availability Controls
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Topics

CIA Triad & Core Security Concepts

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