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Content Delivery Network
A Content Delivery Network is a geographically distributed network of proxy servers and data centers. The goal is to provide high availability and performance by distributing the service spatially relative to end-users. CDNs deliver static content like images, videos, and stylesheets.
Key Components
Edge Servers (PoPs)
Origin Server
DNS-based Global Load Balancing
Caching Layer
SSL/TLS Termination
Design Challenge
Ensuring cache consistency and efficient invalidation across thousands of edge locations.