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