Gratuitous ARP || ARP Table Update || ARP 7

This video describes the concept of gratuitous ARP on a network in the proactive update of the ARP cache table when a host experiences a change in IP address or MAC address.
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The Gratuitous ARP message might be seen as unnecessary, but it is in fact a measure taken by devices on the network to inform other hosts of a change in their ARP mapping. This is because, from the moment a hosts IP address or MAC address changes, its ARP mapping present in the ARP cache tables of connected hosts may become invalid.