EA - IT Architecture V2 > Architecture Specification > Modeling IT Infrastructures > Describing IT Infrastructures > Describing an IT infrastructure
Describing an IT infrastructure
*An IT Infrastructure is composed of several connected computer devices (IT network nodes or computing systems) and computer networks.
You can describe the components of an Infrastructure in an infrastructure assembly diagram.
Creating an IT infrastructure 
To create an IT infrastructure from the Infrastructure navigation menu:
1. Select Infrastructure > IT Infrastructures.
The IT Infrastructures tree deplays.
2. Select the IT Infrastructures file and click New > IT Infrastructure.
The Creation of IT technical device window appears.
3. Enter the Name of your infrastructure as well as its Owner and click OK.
The new IT Infrastructure pops up in the tree.
Creating an Infrastructure Assembly Structure Diagram 
To create an infrastructure assembly structure diagram:
1. Select the IT infrastructure and click Create a diagram.
2. Select Structured diagram.
The infrastructure assembly structure diagram opens in the edit zone.
Using an infrastructure assembly structure diagram 
In an infrastructure assembly structure diagram, you can insert:
You can insert in this diagram:
• IT servers and Computing devices, see Describing a Computing Device,
*An IT Server is an IT component providing a service to users connected via an IT network. This IT component can house databases and run applications.
*A computer device is a device which provides a computing service to the end-users directly. This computer can house databases and run applications. This is, for example, a workstation, a laptop or a smartphone.
• IoT Devices, see Describing a Computing Device,
*An IoT device is both a hardware device and a computing device which provides cvombined hardware and information services to the users using it directly. As a hardware device, it embeds sensors - e.g. accelerometer - which provide data to the embedded computing device. As a computing device, it can host data stores or run applications. Examples: smartwatch with GPS tracker, on-line surveillance video camera with live IP video feed, connected weighting scale with weight history management
• Network devices, see Describing a Computer Network Device,
*An IT device can host and run Software Technology. Conjointly with its hosted software, it provides services. This consists of, for example: Wifi Access Point, Firewall, router, switch, printer, Hard Drive.
• IT Network Components, see Describing an IT network,
*An IT network is set of IT equipment components (e.g.: routers, switches, firewalls) that allow remote communications between computing devices (e.g.: IT server). An IT network can be broken down into sub-networks.
• Ports and network channels, see Describing technical communications.
• service interactions.
*A Service Interaction represents an interaction for service purpose between entities in a specific context inside or outside a company. These entities can be enterprise org-units, applications, activities or processes, as well as external org-units. The content of this interaction is described in a service interface.
*For more information about service interactions, see Describing the services communications.
The Infrastructure description report allows you to analyze the infrastructure components and the expected relationships between them to verify that each element described in the diagram hosts a software or hardware component.
*For further details, see .For further details, see Infrastructure Description Report.