# Review AD DS Tier Model for Privileged Access Security in Windows Server before AD/DNS changes > Use AD DS Tier Model for Privileged Access Security in Windows Server to review this narrow operational decision without extending the source beyond its stated scope. - Canonical URL: https://update.dsesecurity.com/updates/review-ad-ds-tier-model-for-privileged-access-security-in-windows-server-before-ad-dns-changes/ - Publisher: Detection Systems & Engineering (DSE Security) - Author: DSE Security Editorial Team - Published: 2026-08-27T17:07:06+00:00 - Modified: 2026-08-27T17:07:30+00:00 - Last reviewed by DSE: 2026-08-27 - Resource type: Playbook - DSE priority: Advisory - Topics: Cybersecurity, Microsoft 365 & Identity, Networks & Infrastructure - Reading time: 3 minutes ## What you need to know Use AD DS Tier Model for Privileged Access Security in Windows Server to review this narrow operational decision without extending the source beyond its stated scope. ## Potentially affected Teams, systems, services, or facilities within the stated scope of AD DS Tier Model for Privileged Access Security in Windows Server ## DSE recommendation Compare the observed state with the cited official source, document applicability and exceptions, and test any approved change with rollback safeguards. ## Article Keep this document to one review outcome: Review AD DS Tier Model for Privileged Access Security in Windows Server before AD/DNS changes. Only the official source and traced locations below supply facts. Confirm applicability before acting. ## Source fact: The official [AD DS Tier Model for Privileged Access Security in Windows Server](https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/tier-model) from Microsoft supports the following bounded statements: - At Introduction below H1, Microsoft states: “The Active Directory Domain Services (AD DS) tier model is a security architecture that separates administrative identities, workstations, and managed assets into trust tiers.” The research record locates this support at Introduction below H1. - At Introduction below H1, Microsoft states: “It prevents cyberattackers who compromise an end-user device from stealing higher-privilege credentials and escalating up to the identity control plane.” The research record locates this support at Introduction below H1. The source support ends with the statements listed above. Use them to examine forests, domains, controllers, directory partitions, trusts, sites, replication links, service accounts, and delegated roles in the applicable environment, not to imply a wider guarantee. ## What the source does not establish The cited page and retained statements do not establish the current state of any DSE or customer environment, prove that the documented configuration is applicable, or authorize a production change. Confirm supported versions, dependencies, and the current live source before use. It does not establish a deployment’s current state, authorize a production change, prove compliance, or show that Windows DNS, time synchronization, network reachability, PKI, backups, virtualization safeguards, and privileged identity are healthy. Documented options are review inputs, not universal mandates. ## Applicability questions - For source statement 1 at Introduction below H1, which observable configuration, record, or test can confirm applicability here? - For source statement 2 at Introduction below H1, which observable configuration, record, or test can confirm applicability here? - Within forests, domains, controllers, directory partitions, trusts, sites, replication links, service accounts, and delegated roles, which versions, roles, and configuration states define the review population? - Could Windows DNS, time synchronization, network reachability, PKI, backups, virtualization safeguards, and privileged identity invalidate the test, hide a failure, or change applicability? - Who owns the decision, and which observation requires stopping, escalation, or rollback? ## DSE recommendation: DSE recommends using the cited source as the evidence anchor for this decision. Make the source, asset scope, owner, and expected outcome explicit in the review record. Record the source location, examined part of forests, domains, controllers, directory partitions, trusts, sites, replication links, service accounts, and delegated roles, observed and expected states, owner, and reason for deviation. An implementation decision needs an owner, approved window, prechecks, observable outcome, stop authority, and rollback path. Validate Windows DNS, time synchronization, network reachability, PKI, backups, virtualization safeguards, and privileged identity before and after the test, and store only sanitized operational evidence. ## Verification and evidence A reviewer should be able to retrace the decision from Introduction below H1; Introduction below H1 through directory and policy exports, replication and locator tests, event logs, trust state, role ownership, and controlled authentication tests. Record what was collected, where, when, by whom, and which system or role it represents. Label this evidence set DSE-20260827-020 so observations, approvals, exceptions, and later rechecks cannot be substituted from another source review. Preserve both successful and failed observations, along with approval and rollback evidence. Avoid uncontrolled production experiments. Assign an expiry or event-driven recheck so the conclusion is not treated as permanent. ## Official references - [AD DS Tier Model for Privileged Access Security in Windows Server](https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/tier-model) — Microsoft ## Primary reference - Name: AD DS Tier Model for Privileged Access Security in Windows Server - Authority: Microsoft Learn - URL: https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/tier-model - Source publication date: Not stated by the source ## Citation and use Preferred citation: “Review AD DS Tier Model for Privileged Access Security in Windows Server before AD/DNS changes,” DSE Security, https://update.dsesecurity.com/updates/review-ad-ds-tier-model-for-privileged-access-security-in-windows-server-before-ad-dns-changes/ Publishing principles: https://update.dsesecurity.com/updates/dse-updates-editorial-methodology/ Usage and citation policy: https://update.dsesecurity.com/usage/ Copyright © 2026 Detection Systems & Engineering. 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