However, the aforementioned notification mechanisms are utilized in 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 {HEAD ~ a test request} from {TAIL ~ each redundant network access point} of a node  
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However , the aforementioned notification mechanisms are utilized in 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 { HEAD ~ a test request } from { TAIL ~ each redundant network access point } of a node
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