What is a ARP cache and how do I clear this cache?

Each time I try to repair my internet connection it states, "unable to complete the repair because it was unable to clear the ARP cache. I do not know or am unable to find in any help file where or what this cache is. Assistance with this would be appreciated greatly. thank you

See:
* http://www.mydigitallife.info/2007/06/20/clear-delete-and-refresh-arp-cache-entry/

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What is a ARP cache and how do I clear this cache?

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