A CDE Definition
(Nearest Active Upstream Neighbor) In a token ring network, the station that precedes this station. When the network beacons, the NAUN initiates the beacon removal process. Contrast with NADN. See beacon removal.
In a token ring network that is beaconing, the process of the network adapter disconnecting itself from the network in order to do a self test. If the test passes, it reconnects. See beaconing.
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