Windows DNS response rate limiting (RRL) must be enabled.

This setting can prevent someone from sending a denial-of-service attack using the DNS servers. For instance, a bot net can send requests to the DNS server using the IP address of a third computer as the requestor. Without RRL, the DNS servers might respond to all the requests, flooding the third computer.

As an administrator, run PowerShell and enter the following command: "Get-DnsServerResponseRateLimiting".

If "Mode" is not set to "Enable", this is a finding.

As an administrator, run PowerShell and enter the command "Set-DnsServerResponseRateLimiting" to apply default values or "Set-DnsServerResponseRateLimiting -WindowInSec 7 -LeakRate 4 -TruncateRate 3 -ErrorsPerSec 8 -ResponsesPerSec 8".

These settings are just an example. For more information, go to: https://learn.microsoft.com/en-us/powershell/module/dnsserver/set-dnsserverresponseratelimiting?view=windowsserver2022-ps