Transmission Media Models

LAN Environment

Transmission Media Models

The Transmission Media models are used to represent the physical cable over which packets travel between various devices on a LAN. They are restricted to being connected to NIC models. The two types of Transmission Media models provided in netWorks are the Hub and Media models. These models are functionally equivalent in this application with the only difference between them being their icons.

A sample control panel for a Media model is shown in Figure 4.4.

Figure 4.4: Sample Media Model Controls

Note that this control panel is very similar to the NIC control panel. The properties of the Media model (Speed, Avg. Length) are used to calculate the propagation delay of a packet over the simulated media. The Average Length value is used to represent the average distance between two devices connected to this Media model. The Network Address section of the control panel is similar to that of a NIC model except that the Static check box is replaced with a Distribute check box. You can use this feature to assign Network Addresses automatically to any NIC models attached to Transmission Media models when you exit the dialog box. (The application uses the network address of the Media model as the base address for its subnetwork and increments the host portion of the address to generate network addresses for each of the attached models.) The MAC Protocols section of the control panel has a similar check box for automatically distributing a MAC protocol to all attached NIC models as well. These features expedite the network model build process.

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