I'm new to Networking and I was reading about the Interior and Exterior Gateway Protocols ,but i couldn't understand some points , as stated in a reference:
IGPs are designed to work in private networks. An IGP is used to route within the individual networks of a single organization (networks having the same autonomous system).
EGPs on the other hand, are designed for use between different autonomous systems that are under the control of different administrations. They can be used to provide paths in the public network (Internet)
The Internet is a network of networks, and autonomous systems are the big networks that make up the Internet. So according to this what i want to know:
- Does a company private network can be considered as an autonomous system ? In other words , How Networks are classified as a single a autonomous system ? having the same routing policy ? IP Ranges ?
- Do interior gateway protocols such RIP, OSPF and EIGRP are only used on private networks and not used on the internet ?
- If so , Does BGP is the only protocol that is used on the internet to connect different autonomous systems?
Also any example would be appreciated .