# Simulation Mode

## 1. Modification of the Infrastracture

The infrastructure of the virtual computer network and the IP configuration of the components can be modified in the design mode. Switch to this mode using the icon at the upper panel.

## 2. Using and Installing Software

Performing a double-click at a computer/notebook the virtual desktop of the component is opened as a new window. Using the icon at the upper left corner of this window opens another internal window to select the installed software at the computer, i.e. to install and remove programmes.

The graphical user interfaces of these programmes are opened by selecting the icons at the virtual desktop. The behaviour of these programmes does not depend on whether the graphical user interface, i.e. the internal window, is opened or not.

## 3. Looking at the IP Configuration

It is possible to have a look at the IP configuration by selecting the icon in the lower right corner of the desktop window.

## 4. Observing the Data Exchange

The time delay during the simulation of the data exchange can be changed by the slider at the upper panel of the main window.

Every data unit which is sent or received by a computer is logged and can be displayed. Use the context menu to open the window which displays the window with the data units.

In the table with the data units every protocol data unit is represented by one or more rows. The protocol data units of the four layers of the Internet layer model are shown. It is possible to select the layers of which the data units are shown by a context menu.

## 5. Configuring the Firewall of the Router

To configure the firewall every router provides a web interface. Therefore, to configure the firewall in the simulation mode it is necessary to start the webbrowser at a connected computer and to start with an IP address of the router to address its web-server.

The configuration and activation or deactivation of the firewall is done by a web formular. Besides there is the possibility to look at the logging data of the firewall.

## 6. State of the Switch

The switch stores the MAC addresses of incoming protocol data units in connection with the port of the physical connection. This data is stored in the Source Address Table (SAT). It is possible to show this table by a double-click on the switch.