This figure displays the Client Tier, Presentation Tier, Business Service Tier, and Data Tier of the Multitiered Architecture Model.
The leftmost tier, the Client Tier, contains two representative client applications.
The next tier to the right, the Presentation Tier, shows two representative presentation services.
The next tier to the right, the Business Service Tier, shows three representative business services.
The rightmost tier, the Data Tier, shows a representative database service with storage and a representative directory service with storage.
The figure shows that each of the services can interoperate with any of the other services and also with the client applications in the Client Tier.