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A host on a LAN needs to check whether it's IP address is used by another host. What type of ARP should it use?
Gratuitous ARP
Reverse ARP
Proxy ARP
ARP request
With gratuitous ARP, the host sends an ARP request for it's own IP address, and if it gets an answer, another node is already using the address. In a normal ARP request, the destination address isn't it's own address. Proxy ARP is used mainly on routers, and reverse ARP is used to get an IP address (a predecessor of DHCP.)
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