IGRP is Interior Gateway Routing Protocol, enhanced by Cisco proprietary Enhanced IGRP.
There are many connectionless protocols depending on which layer of the OSI model you are referring to. An example would be UDP for transport, and IP for routing.
ipp, lpd/lpr, and http AND ALSO smb and jetdirect-Madwraith =3
Something that allows the computer to communicate across the network.
A set rule for transfer data