The Ethernet hub is arranged to connect {TAIL ~ the network port} and {HEAD ~ the port} of the first interface 
The Ethernet hub is arranged to connect { TAIL ~ the network port } and { HEAD ~ the port } of the first interface
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH