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