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Title: 1.1 - Architecture Overview
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# 1.1 - Architecture Overview
The Apache Directory Server (aka *ApacheDS*) architecture has many different layers. The following schema expose the most important ones :
![ApacheDS architecture](images/architecture.png)
As we can see, we distinguish four different layers :
* the network
* the Session
* the PartitionNexus
* the Backends
We will describe in detail those layers in the following chapters.