I'm studying from Lammle book on routing and switching. The setup in the picture is in the book. how can I connect one port of a device to more than one device (as in the figure), and how can I connect two hosts to the same port on a switch or router? I don't know what simulator the book is using, but I'm using Cisco Packet Tracer.
Another question: how using serial connection is different from the Ethernet connection?