TL;DR Edge Node
An edge node is an individual server within a CDN or content delivery network that sits at the outer edge of the network, close to end users, rather than at a central data centre. When a user requests your website, the request is routed to the nearest edge node which either serves a cached copy of the content immediately or fetches it from the origin server and caches it for future requests. The more edge nodes a network has and the better they are distributed geographically, the faster and more reliable content delivery becomes. CloudSonic uses Cloudflare Enterprise which operates over 310 edge nodes in more than 100 countries, meaning your content is always close to your visitors no matter where they are. Each edge node also provides DDoS protection and security filtering at the point of delivery.
How an Edge Node Works
An edge node is essentially a server that has been optimised for content delivery rather than content processing. It runs a lightweight stack focused on receiving requests, checking a cache, and either serving cached content or fetching it from the origin server and caching it for next time. Edge nodes are distributed across many geographic locations and connected to each other and to origin servers through high-speed private network links that are faster and more reliable than the public internet. When a visitor makes a request, anycast routing directs it to the edge node with the lowest latency for that visitor's location. The edge node handles the request locally, applies security rules including WAF filtering and DDoS protection, and returns the response without the request ever needing to travel to the origin server in most cases.
