1. Click on the Start button.
2. Initiate a request by selecting the sender and receiver, then click Submit.
3. Now, observe the three phases of Packet Switching: connection establishment, data transmission, and connection termination.
4. Please repeat steps 1 to 3 to understand different scenarios.
5. Note that for demonstration, certain paths simulate connection failures where message transfer is not possible. These occur between devices D2 to D3, D3 to D4, and D3 to D2 to help illustrate unsuccessful transmissions.

Note 1: Move the cursor over the devices to view their information.
Note 2: P1, P2, etc. indicate port numbers in the switch device.
Note 3: The color code along the line indicates: