The protocol that is used by network or networks within an autonomous system (AS) to communicate with each other is generically called: interior gateway protocol (IGP).
A network refer to a set of interconnected computer systems (nodes) and the relational ties linking the computer systems together, especially for the purpose of exchanging (transmitting) data electronically.
An autonomous system (AS) can be defined as a network or group of networks that are administered or managed by an individual or business firm while using a single set of management rules.
Generally, an autonomous system (AS) typically uses a single (one) Internet Protocol (IP) routing protocol.
In this context, the protocol that is used by network or networks within an autonomous system (AS) to communicate with each other is generically called an interior gateway protocol (IGP).
On the other hand, an exterior gateway protocol (EGP) is the protocol that is used by autonomous systems (AS) to communicate with each other.
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