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DNS Anycast alone cannot protect against DDoS attacks. However, it helps to fight off this kind of attack.

It is important to note the difference between DNS DDoS and website DDoS. When there is a DDoS attack on a website, the website is flooded with requests, which in turn disrupts the service on the web server.

In the case of a DNS DDoS attack, the website is not the target, but rather the responsible DNS server. If an attacker overloads the DNS server with requests, this DNS server may not be able to respond to other requests, for example, so the website is no longer available.

Because DNS Anycast uses multiple DNS servers, it cannot prevent a DNS DDoS attack in advance, but it can more effectively fight it off.

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