I just recently bought TCP/IP Illustrated volume 1 first edition for cheap and I see that they reference a test network throughout the book that looks like the following
Now I'm not the sharpest tool in the shed, but some of these operating systems seem to be quite dated, and I'm unsure if I can even find them to use in virtualbox. Additionally, I've no clue what a Telebit NetBlazer is or what would represent a modem if I attempt to setup a virtual environment to emulate this network.
So my question is, what would be the easiest way for me to come as close as possible to emulating this test network that the book references so that I can get the most out of the material?