Presentation update

## 4.3 Architecture

Figure 4.1 gives a high-level overview of a PKI architecture.

<div align="center">

<img src="media/PKI-diagram.png" width="600">

<strong>Figure 4.1.</strong> Illustrative PKI architecture

</div>

Figure 4.1 gives a high-level overview of a generic and illustrative PKI architecture.

![Figure 4.1-1: PKI diagram](media/PKI-diagram.png)

**Figure 4.1-1: PKI diagram**

## 4.4 Operationnal Environment

The enterprise shall have a production system for issuing certificates and can be expected to have a separate test system for checking configuration changes and software updates before they are deployed.