What is the difference between a white-listing and a black-listing in DDoS mitigation?

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Grade: Education Subject: Ddos
What is the difference between a white-listing and a black-listing in DDoS mitigation?
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A white-listing approach involves adding a server to a list of trusted sources, allowing legitimate traffic to pass through. A black-listing approach blocks traffic from known malicious sources. Both are used, but white-listing is generally preferred for security.