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Protocol - is a convention or standard that controls or enables the connection, communication, and data transfer between two computing endpoints.
communications protocol is the set of standard rules for data representation, signalling, authentication and error detection required to send information over a communications channel.

TCP/IP - set of communications protocols that implements the protocol stack on which the Internet and many commercial networks run.

NIC - A domain name registry, also called Network Information Centre (NIC), is part of the Domain Name System (DNS) of the Internet which converts domain names to IP addresses.

Peer-to-Peer Network Connection - in a peer-to-peer network there are no dedicated servers or hierarchy among the computers. All of the computers on the network handle security and administration for themselves. The users must make the decisions about who gets access to what. Beyond that there are more similarities between the types of network than differences. All of the computers must have network cards. You also use the same cables, the same hubs and switches, and the same protocols as you would with a client-server model. The only difference is that there isn't a server. Since there isn't a server, there are some things to think about before you go down the peer-to-peer path