Zero Trust Architecture

Zero trust replaces "trust the internal network" with "verify every request". This roadmap explains the principles and how to move an organization toward them step by step. Networking and identity basics help.

• Understand your current network and identity setup
• Read the NIST SP 800-207 summary
• Plan your study time

• CyberA4U Academy — courses

NIST SP 800-207 defines zero trust: no implicit trust based on location, per-request authentication and authorization, least privilege, and continuous evaluation.

• Explain the core tenets of zero trust
• Understand policy engines and enforcement points
• Recognize what zero trust is not

Tools & tech: Architecture

• NIST SP 800-207 — Zero Trust Architecture

In zero trust, strong identity — phishing-resistant MFA, conditional access and least privilege — becomes the main control.

• Strengthen authentication
• Use conditional access based on risk
• Apply least privilege everywhere

Tools & tech: Architecture

• CISA — Zero Trust Maturity Model

Access decisions also consider the device: is it managed, patched, encrypted and healthy?

• Define device health requirements
• Use device signals in access decisions
• Handle unmanaged devices

Tools & tech: Architecture

• Google — BeyondCorp

Micro-segmentation limits lateral movement by allowing only necessary connections between workloads.

• Identify critical assets and flows
• Apply micro-segmentation gradually
• Monitor allowed and denied traffic

Tools & tech: Architecture

• NIST NCCoE — Implementing a Zero Trust Architecture

ZTNA gives users access to specific applications — not whole networks — based on identity and device checks, replacing broad VPN access.

• Compare ZTNA and traditional VPNs
• Publish applications through an access proxy
• Plan migration from VPN

Tools & tech: Architecture

• Google — BeyondCorp

Policy engines decide each access request using identity, device, resource and context. Policies must be clear, tested and versioned.

• Understand policy decision and enforcement points
• Write access policies
• Test and version them

Tools & tech: Architecture

• Open Policy Agent documentation

Zero trust needs rich telemetry — every access decision, identity and device signal — to detect misuse and tune policies.

• Log every access decision
• Correlate identity, device and network data
• Use analytics to refine policies

Tools & tech: Architecture

• NIST SP 800-92 — Guide to Computer Security Log Management

Zero trust is a journey. Start with high-value applications and identity, measure maturity, and expand step by step.

• Assess maturity with the CISA model
• Prioritize by risk and effort
• Plan phased migration

Tools & tech: Architecture

• CISA — Zero Trust Maturity Model

Zero trust efforts fail when treated as a product purchase, when legacy systems are ignored, or when user experience is so poor that people work around controls.

• Recognize common pitfalls
• Plan for legacy systems
• Keep user experience in mind

Tools & tech: Architecture

• CISA — Zero Trust Maturity Model

Vendors all claim "zero trust". Evaluate products by how they fit your architecture, integrate with identity and devices, and support standards.

• Define evaluation criteria from your architecture
• Test integration with existing identity and devices
• Avoid lock-in

Tools & tech: Architecture

• NIST SP 800-207 — Zero Trust Architecture

Measure progress with maturity levels per pillar and outcomes such as fewer broad network permissions and faster detection of misuse.

• Track maturity per CISA pillar
• Measure reduced implicit trust
• Report progress regularly

Tools & tech: Architecture

• CISA — Zero Trust Maturity Model

NIST's NCCoE project shows practical zero trust implementations built with commercial products.

• Study reference implementations
• Adapt patterns to your environment
• Document your target architecture

Tools & tech: Architecture

• NIST NCCoE — Implementing a Zero Trust Architecture

Check that you can explain zero trust, assess maturity and plan a realistic migration.

• Explain the principles and components
• Assess maturity by pillar
• Plan phased implementation

• CyberA4U CTF Arena — practice challenges

You now understand zero trust. Continue with IAM Security, Security Architecture or Network Administrator.

• Keep your roadmap document
• Choose your next roadmap
• Share your architecture

• CyberA4U CTF Arena — practice challenges