Merge pull request #222 from markus-gsf-seidl/feature/ddos-protection

Azure WAF Use DDoS Protection

docs/catalog/cloud/use-ddos-protection.md

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+---
+version: 1.0
+submitted_by: markus-ntt-seidl
+published_date: TBD
+category: cloud
+description: [PATTERN_DESCRIPTION_METADATA]
+tags: 
+ - cloud
+ - size:small
+---
+
+# Use DDoS protection
+
+## Description
+
+Distributed Denial of Service (DDoS) is used to increase the load of server in a way, that they are unable to respond to any legitimate requests. This is mostly done to harm the owner of the service or hardware. 
+Due to the nature of attack, a lot of environmental resources are used up by nonsensical requests.
+
+## Solution
+
+All cloud providers provide some form of DDoS protection (AWS Shield, Azure DDoS Protection, GCP DDoS Protection, CloudFlare, ...) that can prevent those attacks.
+
+## SCI Impact
+
+`SCI = (E * I) + M per R`  
+[Software Carbon Intensity Spec](https://grnsft.org/sci)
+
+This pattern affects the SCI as follows:
+
+- `R`: The amount of requests will be reduced, due to not fulfilling DDoS requests
+
+## Assumptions
+
+- Assumes that the budget of the project can afford the costs for the DDoS protection service
+
+## Considerations
+
+- Consider purchasing the advanced protection tiers of the cloud providers to be fully protected against similar DDoS attack patterns
+
+## References
+
+- [Azure Well-Architected Framework Sustainability Pillar](https://learn.microsoft.com/en-us/azure/architecture/framework/sustainability/sustainability-application-design)