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CompTIA CySA+ Cybersecurity Analyst · CompTIA
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
DNS is the first place to look because a DDoS that prevents users from reaching external SaaS services often overwhelms or disrupts DNS resolution, making all outbound connections fail. If DNS is down or flooded, nothing external can be reached, even if the internet connection itself is still up.
C. DNS is often targeted in DDOS attacks.
DNS does not use CDN, CDN uses DNS. Thus, DNS is the most correct answer.