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Maturity tier — Then: Strongly recommended once the basics are done.
Implementation effort: Low – requires validation of DNS-based name resolution and deployment through GPO, Intune, DHCP, or PowerShell.
User impact: Low – no impact in modern environments using DNS. Legacy systems depending on NetBIOS may require remediation before disabling.
NetBIOS name resolution is a legacy Windows networking feature that is no longer required in most modern Active Directory environments. Leaving NetBIOS enabled can expose systems to attacks such as NBNS spoofing, credential interception, and information disclosure.
If your environment relies on DNS for name resolution, disabling NetBIOS over TCP/IP helps reduce unnecessary network traffic and eliminates an outdated protocol that attackers frequently abuse.
Related hardening guidance:
Keep building momentum
Protect LSASS from memory dumping and credential theft attacks like Mimikatz by enforcing LSA Protection (RunAsPPL) and Credential Guard.
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