How to identify the IP address of the neighbours in the LAN , if the IP is assigned dynamically by DHCP server?

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I am new to networking domain. I read about ARP , but it still needs IP address to get MAC info. So How a devcie can idnetify its neighbors IP address to have peer to peer communication. Thank you in advance.

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IP address can be entered manually , otherwise you can input a domain name which is associated with an ip address. In case of a Domain name , the device must have a DNS server.

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