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Redundancy and Fault Isolation

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Overview

Redundancy and fault isolation are defensive strategies used in cybersecurity to enhance system reliability and availability by minimizing the impact of component failures. These practices ensure continuous operation and limit the spread of faults within networks or systems.

Security Objectives

Ensure system availability and continuity of service
Reduce risk of single points of failure
Enhance resilience against hardware, software, or network faults

Where It Is Applied

Network infrastructure and data center environments
Critical systems such as servers, storage, and communication devices
Operational technology and cloud architectures

How It Works (High Level)

Redundancy involves duplicating critical components or functions so that if one fails, another can immediately take over. Fault isolation separates system components or segments to contain failures and prevent them from affecting other parts of the system.

Benefits and Limitations

Improves system uptime and reliability
Limits damage and impact of failures
May increase complexity and cost
Requires careful design to avoid introducing new vulnerabilities

Operational Considerations

Requires thorough planning and understanding of system dependencies
Must be integrated with monitoring and incident response processes
Balancing redundancy with cost and performance constraints can be challenging