The tool that sets rules for both the transport of data packets and the addressing system for a network such as the ARPANET is called; Protocol
<h3>Understanding Protocols</h3>
In computer systems communications, a protocol is defined as a set of rules and regulations that allow a network of nodes to transport and receive data information.
Now, each transport layer in a system of network such as ARAPNET will always have a protocol set such as TCP and IP.