However, {HEAD ~ the aforementioned notification mechanisms} are utilized in {TAIL ~ yet other embodiments} to confirm the existence of a fully functional bi directional path using only a test request and a test reply—or via separate tests initiated by issuing a test request from each redundant network access point of a node  
are utilized in
However , { HEAD ~ the aforementioned notification mechanisms } are utilized in { TAIL ~ yet other embodiments } to confirm the existence of a fully functional bi directional path using only a test request and a test reply — or via separate tests initiated by issuing a test request from each redundant network access point of a node
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH