{TAIL ~ Network connectivity} is determined by a redundantly connected node by testing connectivity between {HEAD ~ the nodes} primary and backup physical network access points 
{ TAIL ~ Network connectivity } is determined by a redundantly connected node by testing connectivity between { HEAD ~ the nodes } primary and backup physical network access points
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH