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Zero Trust Concepts
The Zero Trust Concepts course teaches the principles, architecture, and pragmatic adoption patterns of zero trust — from 'never trust, always verify' through identity-centric access, microsegmentation, ZTNA, and continuous verification — with cross-references to NIST SP 800-207, BeyondCorp, and modern policy engines.
Who Should Take This
Architects, security engineers, and IT decision-makers planning or executing a zero-trust migration. Assumes familiarity with traditional perimeter-based security and modern identity concepts. Learners finish able to evaluate ZTA maturity, design phased migration plans, and recognize zero-trust marketing claims that don't deliver real benefit.
What's Included in AccelaStudy® AI
Adaptive Knowledge Graph
Practice Questions
Lesson Modules
Console Simulator Labs
Exam Tips & Strategy
13 Activity Formats
Course Outline
1Foundations 3 topics
Principles and Tenets
- Identify the core zero-trust principles: never trust, always verify; assume breach; least privilege per session; explicit verification.
- Identify NIST SP 800-207 as the foundational zero-trust reference and identify the seven tenets it describes.
- Compare zero-trust principles with traditional perimeter security ('castle-and-moat') and analyze the threat-model differences.
Logical Components: PE, PA, PEP
- Identify the NIST 800-207 components: Policy Engine (PE), Policy Administrator (PA), and Policy Enforcement Point (PEP) and describe the role of each.
- Apply the PE/PA/PEP model to a sample architecture where a user accesses an internal application via a ZTNA broker and identify each role.
BeyondCorp and BeyondProd
- Identify BeyondCorp as Google's user-to-application zero-trust model and BeyondProd as the equivalent for service-to-service.
- Compare BeyondCorp's identity- and device-centric access model with traditional VPN-based remote access.
2Identity-Centric Access 3 topics
Strong Authentication for ZT
- Identify phishing-resistant MFA (WebAuthn/FIDO2/passkeys) as a foundational requirement for zero trust and identify TOTP/SMS as insufficient for high-value access.
- Apply phishing-resistant MFA rollout sequencing: high-privilege accounts first, then critical applications, then broad workforce.
Continuous Verification
- Define continuous verification and identify common signals: device posture, location, behavior, session age, and risk score.
- Apply step-up authentication on signal change (e.g., new device, anomalous location) without disrupting steady-state user experience.
Per-Request Authorization
- Distinguish session-level authorization (one-time check, then trusted) from per-request authorization (every request re-evaluated against policy).
- Analyze a session-level authorization scenario where a user's role changes mid-session and explain the failure mode of session-level checks.
3Microsegmentation 3 topics
Network Microsegmentation
- Define network microsegmentation and distinguish it from VLAN/subnet macrosegmentation.
- Apply microsegmentation between application tiers (web, app, db) with default-deny east-west traffic and explicit allowlists between tiers.
Application and Identity-Based Segmentation
- Identify identity-based segmentation patterns where access is granted by workload or user identity rather than IP/network location.
- Compare network-based segmentation (NSGs, firewalls) with identity-based segmentation (mTLS + SPIFFE) and analyze when each is appropriate.
East-West Traffic Control
- Identify east-west traffic as intra-datacenter or intra-cloud traffic and identify ransomware lateral movement as a primary east-west threat.
- Apply east-west microsegmentation in a datacenter where a flat network previously allowed unrestricted lateral movement.
4ZTNA and Remote Access 3 topics
ZTNA vs Traditional VPN
- Define ZTNA and identify the core differences from traditional VPN: per-application access, identity-driven, no implicit network trust.
- Apply ZTNA selection guidance: replace traditional VPN where users access a small set of internal apps; keep VPN where broad network reachability is genuinely needed.
ZTNA Architectures
- Distinguish service-initiated (SaaS broker pulls connections) from endpoint-initiated ZTNA and identify a representative product for each.
- Analyze a hybrid scenario where some applications are SaaS-fronted and others sit in legacy datacenters and propose a ZTNA topology.
Common ZTNA Pitfalls
- Identify common ZTNA failure modes: still-implicit-trusted backend network, missing app-level authz once at the app, broker bypass via direct routes.
5Service Mesh and Workload Identity 3 topics
mTLS Between Services
- Define mutual TLS and explain why service-to-service mTLS provides authenticated and confidential intra-cluster communication.
- Apply mTLS automation via a service mesh (Istio, Linkerd) or sidecar pattern and explain the operational benefit of automated cert rotation.
SPIFFE and SPIRE
- Identify SPIFFE as a workload-identity standard and SPIRE as its reference implementation, and describe SPIFFE IDs.
- Compare SPIFFE-based identity with cloud-provider workload identity (AWS IAM roles, GCP Workload Identity, Azure managed identities) and identify when SPIFFE adds value.
Service-to-Service Authorization
- Apply per-service authorization where a service identity is required and policy decisions are made per-call (e.g., Istio AuthorizationPolicy or OPA sidecars).
6Adoption and Maturity 3 topics
CISA Zero Trust Maturity Model
- Identify the CISA Zero Trust Maturity Model pillars (Identity, Devices, Networks, Applications & Workloads, Data) and the four maturity stages (Traditional, Initial, Advanced, Optimal).
- Apply a self-assessment of an organization's identity pillar maturity and identify the next concrete step toward 'Advanced' maturity.
Phased Adoption
- Identify a pragmatic ZT migration sequence: phishing-resistant MFA → device posture → ZTNA pilots → microsegmentation → service mesh.
- Analyze an enterprise's mid-flight ZT adoption (e.g., MFA done, microsegmentation absent) and propose the next 12 months of investment.
Anti-Patterns and Marketing
- Identify common 'zero-trust washing' marketing patterns: relabeling VPN as ZTNA without per-app access, calling network segmentation 'zero trust', or claiming ZT requires a single-vendor stack.
- Analyze a 'ZT in a box' product claim and evaluate which of the seven NIST tenets the product actually satisfies and which it doesn't.
7Devices, Data, and Applications 5 topics
Device Trust and Posture
- Define device trust and identify common posture signals: managed vs unmanaged, EDR present and healthy, OS patch level, disk encryption, screen lock.
- Apply MDM/UEM-derived posture signals to access decisions: only managed + healthy devices can access critical apps; unmanaged devices may access only public-facing services.
- Analyze a 'BYOD with rich posture data' scenario and propose access tiers (full / restricted / browser-only) grounded in observed posture signals.
Device Attestation
- Identify hardware-rooted device attestation: TPM, Apple platform attestation, Android Play Integrity, and identify what each provides versus self-reported posture.
- Apply attestation-gated access for the highest-risk applications (identity admin consoles, customer data exports) where strong device trust is non-negotiable.
Application Pillar Maturity
- Identify the application pillar maturity progression: perimeter-fronted apps → identity-aware proxies → ZTNA-fronted apps → identity- and context-aware in-app authorization.
- Apply identity-aware proxy patterns (Google IAP, Cloudflare Access, AWS Verified Access) for legacy apps that cannot natively integrate identity.
Data Pillar: Classification and Labeling
- Define data classification and identify common labels (Public / Internal / Confidential / Restricted) and the controls each typically requires.
- Apply data classification + label-aware access policies that allow the same user different access depending on the data sensitivity, not just the user's role.
- Analyze a 'sensitivity label leaks during sharing' scenario and evaluate whether end-to-end label persistence (e.g., MIP, AIP) reduces real-world exfiltration.
Continuous Risk Evaluation
- Identify the inputs to a continuous risk score: identity signals, device posture, network telemetry, behavioral baselines, threat intel.
- Apply session-revocation patterns when risk crosses a threshold mid-session, and contrast with simple long-lived session tokens.
8Adoption Acceleration 4 topics
Cultural and Organizational Change
- Identify common organizational obstacles to ZT adoption: legacy app inertia, vendor procurement cycles, security-team-driven changes without engineering buy-in.
- Apply a 'value before pain' adoption pattern: roll out ZTNA where it improves UX (kill VPN), then microsegment, then in-app authz refinement.
Measurement and KPIs
- Identify ZT measurement approaches: % of apps fronted by identity-aware access, % phishing-resistant MFA coverage, mean blast radius per identity, time-to-revoke.
- Apply KPI selection for a year-1 ZT program and explain why 'mean blast radius per compromised identity' is a stronger KPI than 'number of ZT products purchased'.
Quick Wins and Sequencing
- Identify high-leverage quick wins: phishing-resistant MFA for admins, OIDC for CI/CD, ZTNA for one critical app, microsegment one tier in production.
- Apply quick-win sequencing for a 60-day plan that delivers measurable risk reduction without relying on a multi-year transformation.
- Analyze a 'big bang ZT migration' plan and identify the failure modes that lead to it stalling or being abandoned, grounded in real industry case studies.
Federal and Industry Mandates
- Identify the U.S. federal ZT executive order (EO 14028), the OMB M-22-09 requirements, and CISA's Zero Trust Maturity Model as drivers in U.S. government and adjacent industries.
- Apply mandate-driven prioritization: identify which CISA pillar your organization is weakest in and align the next investment with that pillar.
9Cross-Cutting Concerns 2 topics
Logging and Audit for ZT
- Identify the audit requirements for ZT systems: every access decision logged with policy version, signal inputs, and outcome, retained for incident investigation.
- Apply per-decision logging to a policy engine such as OPA and explain why decision logs are first-class evidence during incidents and audits.
Privacy and ZT Telemetry
- Identify the privacy concerns of ZT continuous monitoring (device location, behavior baselines) and identify common controls: data minimization, retention limits, employee disclosure.
- Apply privacy-aware ZT design that achieves its security goals without indefinite retention of personal-context telemetry.
Scope
Included Topics
- Zero trust principles and tenets (NIST SP 800-207).
- BeyondCorp and BeyondProd (Google) as canonical implementations.
- Identity-centric access: strong authentication, continuous verification, contextual signals.
- Microsegmentation (network, application, identity-based) and east-west traffic control.
- ZTNA (Zero Trust Network Access) vs traditional VPN.
- Policy engines and policy-as-code (OPA, Cedar, vendor PDPs).
- Device trust: posture checks, attestation, MDM/UEM integration.
- Service-to-service: mTLS, SPIFFE/SPIRE, service mesh, workload identity.
- Continuous risk evaluation and adaptive access.
- ZTA maturity models (CISA Zero Trust Maturity Model) and phased adoption.
Not Covered
- Vendor-specific platform deep dives.
- Detailed cryptographic protocol implementation.
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