Your question is Network Security: Firewalls vs Intrusion Detection. 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).
Describe the core components of network security and how you differentiate between a firewall and an IDS.
Discuss the main controls used to protect networks, then compare how a firewall and an Intrusion Detection System process traffic, what action each takes, and where each is deployed. Include one practical traffic example and explain how the controls work together.