Unknown protocol drops reports the packets with unknown or un-configured protocol on a per interface basis.
If the router reports unknown protocols, this means that if the router interface is running IP, then it received e.g IPX beside the IP packets... so it drops it, because this protocol is not running on the interface... anyways.. this has something to do with the network and PCc connected... it is nothing major..
You can use a sniffer to identify the unknown protocol.
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