Your question is Firewall Operation and Types. 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 how a firewall works in terms of packet flow and rule evaluation, and compare the main types of firewalls, including packet-filtering, stateful, proxy, and next-generation firewalls.