What is the purpose of setting up Cloudflare's secondary IPv4 DNS servers?

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Grade: Education Subject: Support
What is the purpose of setting up Cloudflare's secondary IPv4 DNS servers?
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Setting up Cloudflare's secondary IPv4 DNS servers provides redundancy and improved performance. If your primary DNS server fails or becomes unreachable, the secondary servers ensure continued website availability and faster DNS resolution for visitors worldwide, utilizing Cloudflare's global network.