Differences between a Multiple Forest Model and a Single Forest Model
Before examining the major advantages and disadvantages of a multiple forest model and a single forest model, consider the following statement: The most ideal implementation is that of a single forest model.
Advantages of a single forest model:
- A single forest implementation has less design, implementation, hardware, and administrative costs when compared to a multiple forest implementation.
- A single forest model enables objects to be shared over domains in a non-complicated manner
- There is a single set of schema objects and configuration objects, and a single Global Catalog.
- You can also implement a single Exchange Organization.
Disadvantages of a single forest model:
- A single forest implementation does not include test environments.
- Because there is only one forest, you need to thoroughly plan and control changes which are made to the forest. Any changes that are made to the forest affect all the domains within the environment.
- You also have to strictly control enterprise components that are shared over all domains
Advantages of a multiple forest model:
- Each business within the larger organization can function in isolation. Businesses can therefore operate independently from one another.
- Isolated schemas and configuration directory partitions enable you to define forest autonomy at the schema level and configuration level.
- For each business, you can define a separate DNS hierarchy.
- Test environments can be implemented.
Disadvantages of a multiple forest model:
- A multiple forest implementation has a far greater design, implementation, hardware, and administrative cost than that of a single forest implementation.
- You need to establish external trusts to domains to share network resources.
- Global Catalog queries only extend to the objects in the local forest.
- You need to implement and manage synchronization between forests.
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