Your question is Layer 2/3 and BGP Fundamentals. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Explain layer 2 and layer 3 packet forwarding, how BGP works, and how you would handle importing routes to BGP when there is no IGP in iBGP.