The edge is where your application meets the internet, and it is the best place to stop bad traffic before it reaches your servers. AWS offers three services that work together there: AWS WAF for application-layer filtering, AWS Shield for distributed denial of service (DDoS) protection, and Amazon CloudFront, the content delivery network (CDN) that serves and filters traffic at a global network of edge locations. Understanding which layer each one covers lets you answer most edge-security questions quickly.
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