# Using this section

The physical architecture diagrams should be read as follows:

* Logical groupings of servers or services are denoted by gray shaded areas, such as Execution, SDLC, and so on.
* Connectivity between servers/services and other services/servers or Talend Cloud is generally not shown on the diagrams unless necessary to demonstrate a key principle - for example, the need for a Load Balancer or API Gateway to achieve API Services high availability.
* There is one diagram per recommended environment: [Environment and Deployment Strategy](https://help.qlik.com/talend/en-US/talend-cloud-physical-reference-architecture/Cloud/environment-and-deployment-strategy)
* The diagrams are presented by the [Architecture Styles and Design Patterns](https://help.qlik.com/talend/en-US/talend-cloud-physical-reference-architecture/Cloud/architecture-styles-and-design-patterns) that can be implemented with a given license level described in [Appendix: Talend Cloud packaging and simpler deployments](https://help.qlik.com/talend/en-US/talend-cloud-physical-reference-architecture/Cloud/appendix-talend-cloud-packaging-and-simpler-deployments). To implement any architectural style, refer to the Data Fabric diagrams: [Talend Cloud Data Fabric Architecture](https://help.qlik.com/talend/en-US/talend-cloud-physical-reference-architecture/Cloud/talend-data-fabric-architecture)