# Validate Use DNS Policy for Split-Brain DNS Deployment with AD/DNS evidence > Use Use DNS Policy for Split-Brain DNS Deployment to review this narrow operational decision without extending the source beyond its stated scope. - Canonical URL: https://update.dsesecurity.com/updates/validate-use-dns-policy-for-split-brain-dns-deployment-with-ad-dns-evidence/ - Publisher: Detection Systems & Engineering (DSE Security) - Author: DSE Security Editorial Team - Published: 2026-08-27T17:05:49+00:00 - Modified: 2026-08-27T17:11:11+00:00 - Last reviewed by DSE: 2026-08-27 - Resource type: Checklist - DSE priority: Advisory - Topics: Cybersecurity, Microsoft 365 & Identity, Networks & Infrastructure - Reading time: 3 minutes ## What you need to know Use Use DNS Policy for Split-Brain DNS Deployment 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 Use DNS Policy for Split-Brain DNS Deployment ## DSE recommendation Compare the observed state with the cited official source, document applicability and exceptions, and test any approved change with rollback safeguards. ## Article Treat this document as a focused evidence review: Validate Use DNS Policy for Split-Brain DNS Deployment with AD/DNS evidence. Only the official source and traced locations below supply facts. Confirm applicability before acting. ## Source fact: The official [Use DNS Policy for Split-Brain DNS Deployment](https://learn.microsoft.com/en-us/windows-server/networking/dns/deploy/split-brain-DNS-deployment) from Microsoft supports the following bounded statements: - At Introduction below H1, Microsoft states: “Note: For information on how to use DNS Policy for split-brain DNS deployment with Active Directory integrated DNS Zones, see Use DNS Policy for Split-Brain DNS in Active Directory.” The research record locates this support at Introduction below H1. - At Introduction below H1, Microsoft states: “Previously, this scenario required that DNS administrators maintain two different DNS servers, each providing services to each set of users, internal and external.” The research record locates this support at Introduction below H1. Do not import neighboring assumptions into the source record. The supported task is a scoped comparison involving Windows DNS servers, AD-integrated zones, policies, forwarders, logging channels, clients, and administrative roles and the conditions the source actually describes. ## 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. Do not read the source as proof of implementation or permission to change production. Its guidance remains conditional on Active Directory replication, domain-controller health, service accounts, routing, time, certificates, and upstream resolution and the environment’s recorded constraints. ## 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 Windows DNS servers, AD-integrated zones, policies, forwarders, logging channels, clients, and administrative roles, which versions, roles, and configuration states define the review population? - Could Active Directory replication, domain-controller health, service accounts, routing, time, certificates, and upstream resolution 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. Use a two-person review for the source interpretation and the resulting operational decision. Record the source location, examined part of Windows DNS servers, AD-integrated zones, policies, forwarders, logging channels, clients, and administrative roles, observed and expected states, owner, and reason for deviation. For an approved change, define prerequisites, a limited test path, success and stop conditions, monitoring, and rollback. Check Active Directory replication, domain-controller health, service accounts, routing, time, certificates, and upstream resolution in design order. Protect credentials, keys, recovery material, personal data, and sensitive topology in evidence. ## Verification and evidence Tie each conclusion back to Introduction below H1; Introduction below H1 and to observable material such as PowerShell exports, zone and policy inventories, sanitized query tests, event-channel data, replication state, and rollback commands. Preserve provenance and stable identifiers without copying secrets into the evidence set. Label this evidence set DSE-20260827-097 so observations, approvals, exceptions, and later rechecks cannot be substituted from another source review. Close the review only when the evidence, exception handling, resulting action, and after-state are linked. Schedule a new review after material technical, organizational, incident, or source changes; today’s observation is not a continuing guarantee. ## Official references - [Use DNS Policy for Split-Brain DNS Deployment](https://learn.microsoft.com/en-us/windows-server/networking/dns/deploy/split-brain-DNS-deployment) — Microsoft ## Primary reference - Name: Use DNS Policy for Split-Brain DNS Deployment - Authority: Microsoft Learn - URL: https://learn.microsoft.com/en-us/windows-server/networking/dns/deploy/split-brain-DNS-deployment - Source publication date: Not stated by the source ## Citation and use Preferred citation: “Validate Use DNS Policy for Split-Brain DNS Deployment with AD/DNS evidence,” DSE Security, https://update.dsesecurity.com/updates/validate-use-dns-policy-for-split-brain-dns-deployment-with-ad-dns-evidence/ 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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