ARP is a table of devices which are currently connected on the network.
So when a new network is setup the router or managed switch stores the ip addresses and MAC addresses in a table. The table is created when a single device sends out an ARP request (i.e. broadcast) to check if a device is on the network using a MAC address.
thats the first thing.
second thing is if we flush the ARP - does that mean we reset the ARP cache which would result in the devices losing connectivity temporarily?
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