AD-SUB-02: Sites with subnet associations count should be retrievable
| ID | AD-SUB-02 |
| Severity | Info |
| Suite | Active Directory (on-premises) |
| Product | Active Directory |
| Feature | Sites and subnets |
| Security area | Infrastructure hardening |
| Resource type | AdSite |
| Reads from | On-premises Active Directory |
What this checks and how to fix it
Section titled “What this checks and how to fix it”Sites with subnet associations are essential for:
- Proper client site assignment: Clients can determine their site based on IP address
- Efficient authentication: Clients authenticate to the nearest DC
- Optimized replication: Site topology guides inter-site replication
- Service localization: Clients find services in their local site
Sites without subnets cannot participate in site-aware operations.
Control Type
Section titled “Control Type”Operational
Security Recommendation
Section titled “Security Recommendation”- Ensure all production sites have appropriate subnets assigned
- Review site-subnet associations during network changes
- Document the rationale for any sites intentionally without subnets
- Validate that subnet boundaries match physical network segments
How the Test Works
Section titled “How the Test Works”This test analyzes subnet-to-site associations to count how many sites have at least one subnet assigned.
Related Tests
Section titled “Related Tests”Test-MtAdSiteWithoutSubnetCount- Counts sites without subnetsTest-MtAdSubnetTotalCount- Counts total subnetsTest-MtAdSiteTotalCount- Counts total sites
Mito check. Author: soulemike. Open-source licences.
Open-source licences. CIS Benchmark material © Center for Internet Security, Inc.; CISA SCuBA baselines are public domain (CC0).
© 2026 Virtual Petals. Mito is a Virtual Petals service, hosted in Microsoft Azure UAE North.