Meta Network Production Engineer interview questions

A brief self introduction, followed by asking which protocol am I most comfortable with and I went ahead with BGP. The interviewer started with basic BGP questions, his questions were too generic (this is the catch). Why can't we use OSPF to connect all the systems together, and what is unique about BGP? What is autonomous system? How is the routing information exchanged? What's the difference between iBGP and eBGP peers? How does BGP differentiate between external and internal peers? How is a BGP session established? How to prevent loopback? How to control inbound/outbound traffic? Is there any inspection before sending a route to a different neighbour, by the sender or receiver?