Explain the CIA Triad and how Zero Trust Architecture enhances modern network defense.
Quick Revision Summary
Clear explanation of Confidentiality, Integrity, and Availability, and how the 'Never Trust, Always Verify' Zero Trust model modernizes perimeter-less security.
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Model Answer & Deep-Dive Explanation
The CIA Triad represents the foundational framework governing information security policies and controls:
- Confidentiality: Ensuring sensitive information is accessible only to authorized entities. Enforced by: AES-256 encryption at rest, TLS 1.3 in transit, Role-Based Access Control (RBAC), and Multi-Factor Authentication (MFA).
- Integrity: Ensuring information and systems remain accurate, complete, and uncorrupted by unauthorized modifications. Enforced by: Cryptographic hashing (SHA-256), digital signatures, and version control.
- Availability: Ensuring authorized users have reliable, uninterrupted access to systems and data. Enforced by: High availability clusters, load balancing, DDoS mitigation, and tested Disaster Recovery (DR) backups.
How Zero Trust Architecture Elevates Defense:
Traditional IT security relied on the "Castle and Moat" model: anyone inside the corporate network was trusted by default. However, with remote work, cloud migration (SaaS/IaaS), and insider threats, network perimeters have dissolved.
Zero Trust Architecture (ZTA) replaces implicit trust with three non-negotiable principles:
- Verify Explicitly: Always authenticate and authorize based on all available data points (identity, location, device health, service or workload, data classification, and anomalies).
- Use Least Privileged Access: Limit user access with Just-In-Time (JIT) and Just-Enough-Access (JEA), risk-based adaptive policies, and data protection.
- Assume Breach: Minimize blast radius by segmenting access by network, user, devices, and application awareness. Encrypt all end-to-end sessions and use analytics for real-time visibility.
Interviewer Evaluation Points & Scoring Rubric
- 1 Clear definition of Confidentiality, Integrity, and Availability with practical examples
- 2 Limitations of traditional castle-and-moat perimeter models
- 3 Three core pillars of Zero Trust: verify explicitly, use least privilege, assume breach
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