Gratuitous ARP, is the ARP that is used to inform the network about IP to MAC Mappings after a change. It is sent as Broadcast message to all the nodes 
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Basically Proxy ARP is the ARP that is used between one more networks. In other words, we can say that Proxy ARP provides data link dicovery between different networks. Here, 
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ARP (Address Resolution Protocol) is a Layer 2 Protocol. Layer 2 uses Physical addresses (MAC addresses) for the communication. Here, ARP Protocol is used to convert a given IP address 
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