Does my Azure public IP have default DDoS protection ( Free ). Currently it shows as "Not Protected"

Services running on Azure are inherently protected by the default infrastructure-level DDoS protection. However, the protection that safeguards the infrastructure has a much higher threshold than most applications have the capacity to handle, and does not provide telemetry or alerting, so while a traffic volume may be perceived as harmless by the platform, it can be devastating to the application that receives it.
Refer the FAQ https://learn.microsoft.com/en-us/azure/ddos-protection/ddos-faq
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