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