How can I test if my system is using Cloudflare Public DNS correctly?

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Grade: Education Subject: Support
How can I test if my system is using Cloudflare Public DNS correctly?
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You can use online DNS leak tests or run command-line tools. For example, on a Linux/macOS system, you can use `dig +short myip.opendns.com @1.1.1.1` and check if the returned IP is your public IP. A successful test suggests that the DNS resolution is handled by 1.1.1.1.