{HEAD ~ The switching hub} transmits the received data only to designated ones among the connected devices, and transmits {TAIL ~ the received data} to the repeater hub 
transmits
{ HEAD ~ The switching hub } transmits the received data only to designated ones among the connected devices , and transmits { TAIL ~ the received data } to the repeater hub
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH