Information Security Control Design and Selection

Correct Answer: Implementing multiple layers of security controls

The principle of 'defense in depth' in information security control design is best described as implementing multiple layers of security controls. This approach provides a comprehensive and layered security strategy that offers protection at various levels of an organization's infrastructure. This strategy is effective because: 1. It creates multiple barriers for potential attackers to overcome. 2. If one layer of security fails, other layers can still provide protection. 3. It addresses different types of threats and vulnerabilities. 4. It combines various security measures such as firewalls, intrusion detection systems, access controls, and encryption. The other options are incorrect because: - Focusing all resources on perimeter security leaves internal systems vulnerable if the perimeter is breached. - Applying the strongest single control available creates a single point of failure and doesn't address diverse threats. - Relying solely on encryption for data protection neglects other crucial aspects of security, such as access control, monitoring, and incident response. Defense in depth is a holistic approach that recognizes the complexity of modern IT environments and the need for multi-faceted protection against evolving threats.

Correct Answer: Implementing dynamic, context-aware security policies

The most effective approach for designing security controls in a 5G network environment is implementing dynamic, context-aware security policies. This is the best answer because:

1. 5G networks are highly dynamic and complex, requiring adaptive security measures.
2. Context-aware policies can adjust to changing network conditions and threats in real-time.
3. This approach allows for more granular and flexible security controls, which is crucial in the distributed architecture of 5G networks.

The other options are less suitable:

Applying traditional perimeter-based security measures is inadequate for 5G networks due to their distributed nature and the erosion of traditional network boundaries.

Relying solely on encryption for data protection is insufficient, as it doesn't address other security aspects like access control, threat detection, and network segmentation.

Focusing on endpoint security while neglecting network segmentation is an unbalanced approach that leaves critical network infrastructure vulnerable to attacks.

Implementing dynamic, context-aware security policies provides a comprehensive and adaptable security strategy that aligns with the unique characteristics and challenges of 5G networks.

Correct Answer: Implementing continuous authentication and authorization for all network resources

The most effective approach for designing security controls in a zero-trust network architecture is implementing continuous authentication and authorization for all network resources.

Zero-trust architecture operates on the principle of 'never trust, always verify.' It assumes that no entity, whether inside or outside the network, should be trusted by default. This approach is fundamentally different from traditional perimeter-based security models.

Continuous authentication and authorization ensure that every access request is verified, regardless of its origin. This aligns perfectly with the zero-trust model, as it constantly validates the identity and permissions of users and devices accessing resources.

The other options are less suitable for a zero-trust architecture:

Establishing perimeter-based security measures contradicts the core principle of zero-trust, which assumes that threats can exist both inside and outside the network perimeter.

Deploying a single sign-on solution, while beneficial for user experience, does not provide the continuous verification required in a zero-trust model. It may actually introduce risks if compromised.

Implementing role-based access control with periodic reviews is a good practice, but it lacks the real-time, continuous verification aspect crucial for zero-trust. Periodic reviews are not frequent enough to address the dynamic nature of threats in a zero-trust environment.

In conclusion, continuous authentication and authorization provide the most comprehensive and aligned approach to implementing zero-trust principles, ensuring constant verification and minimizing the risk of unauthorized access.