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Cisco Certified DevNet Associate (DEVASC) · Cisco
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
Definitely Umbrella
KeyWord = domain Umbrella blocks access to malicious domains, URLs, IPs, and files. The system looks at the nature of any DNS requests and takes an action based on its threat intelligence, which is a large-scale repository of historical data about threats. In turn, Umbrella is building models that classify requests so that you build on its threat intelligence. These requests can be safe and allowed, malicious and blocked, or deemed "risky" and sent to a proxy for deeper inspection.
I think it should be C - Umbrella but I think Firepower can also do that sort of deny action