GPO is a core management technology in Active Directory environments, used to centrally manage the working environment of domain computers and users. A GPO consists of two components: the Group Policy Container (GPC) and the Group Policy Template (GPT). The GPC is stored in the AD database and contains metadata such as version numbers and status; the GPT is stored in the SYSVOL share and contains the actual policy setting files. The GPC is synchronized through AD replication, while the GPT is replicated via DFSR or FRS, with the two replication processes being separate. Group Policy is applied in the order of Local, Site, Domain, and OU (LSDOU), where later applications override earlier ones. Child OUs inherit GPOs from parent OUs by default, and inheritance blocking can be configured; however, enforced GPOs take the highest priority and are unaffected by inheritance blocking.
A GPO is the core management technology in any Active Directory environment, used to centrally manage and configure the working environment of computers and users in a domain. A GPO is the vehicle for applying group policy and contains a set of policy settings.
1. Composition and Storage of a GPO
A GPO consists of two parts
GPC (Group Policy Container)
It is stored in the Active Directory database,
located at: CN=Policies, CN=System, DC=domain,DC=com
Each GPO has a unique GUID in AD, and the container path is:
GPC is synchronized between domain controllers through AD replication (multi-master replication). Each DC keeps a copy of the GPC. Replication delay depends on AD sites and replication topology.
GPT Replication
SYSVOL is replicated between domain controllers using DFSR (starting with Windows Server 2008) or FRS (older systems). The default SYSVOL share path is \\domain\SYSVOL, and the GPT content is replicated to the SYSVOL of all DCs.
Note: GPC and GPT replication are separate.
3. Group Policy Application Order (LSDOU)
The order a Group Policy client follows when applying policies:
Local Group Policy (Local GPO)
Site-level GPO (Site)
Domain-level GPO (Domain)
Organizational Unit GPO (OU)
Order: L-S-D-OU
If there is a conflict: settings applied later override settings applied earlier; if multiple GPOs configure the same policy setting differently, the last GPO applied takes effect.
4. Inheritance, Block Inheritance, and Enforcement
Inheritance: a child OU inherits GPO settings from the parent OU, the domain, and the local GPO by default
Block Inheritance: you can set "Block Inheritance" on an OU to prevent GPOs from parent OUs, the domain, and sites from being applied to that OU and its child OUs. However, blocking inheritance does not affect GPOs marked as enforced.
Enforced/Enforcement: you can set "Enforced" on a GPO link; an enforced GPO has the highest priority, so even if a child OU has block inheritance set, the enforced GPO will still apply. If it conflicts with a non-enforced GPO, the enforced GPO takes effect.
A GPO is the core management technology in any Active Directory environment, used to centrally manage and configure the working environment of computers and users in a domain. A GPO is the vehicle for applying group policy and contains a set of policy settings.
1. Composition and Storage of a GPO
A GPO consists of two parts
2. GPO Replication Mechanism
GPC Replication
GPT Replication
Note: GPC and GPT replication are separate.
3. Group Policy Application Order (LSDOU)
The order a Group Policy client follows when applying policies:
Order: L-S-D-OU
If there is a conflict: settings applied later override settings applied earlier; if multiple GPOs configure the same policy setting differently, the last GPO applied takes effect.
4. Inheritance, Block Inheritance, and Enforcement
Inheritance: a child OU inherits GPO settings from the parent OU, the domain, and the local GPO by default
Block Inheritance: you can set "Block Inheritance" on an OU to prevent GPOs from parent OUs, the domain, and sites from being applied to that OU and its child OUs. However, blocking inheritance does not affect GPOs marked as enforced.
Enforced/Enforcement: you can set "Enforced" on a GPO link; an enforced GPO has the highest priority, so even if a child OU has block inheritance set, the enforced GPO will still apply. If it conflicts with a non-enforced GPO, the enforced GPO takes effect.