virtualbox.org

Hello I would like to know if this is possible. I would like to create a network topology using multiple VMs in Virtualbox.

Essentially, I will have 5 VMs.
VM1 will have two ethernet ports, one connected to VM2 and another connected to VM3.
VM2 will have three ethernet ports, with the other two connected to VM4 and VM5.
VM3, VM4, and VM5 only have the one ethernet port.

Is this possible with Virtualbox?

Easily.

For more advanced users, I recommend checking GNS3 network simulator, that I recently ported to VBox engine.