The Tool Desk
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How a CDN works
A CDN works alongside a website or app’s origin: the server or storage location that holds the original content. When someone requests a file, the CDN checks whether an edge location has a cached copy. If it does, the edge can deliver that copy. If it does not, the CDN obtains the content through its delivery path, commonly from the origin, according to its rules.
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- The origin holds the originals. It is the source of truth for the content.
- Edge locations serve users. Distributed servers make it possible to deliver eligible content from nearer to the person requesting it.
- Caching avoids some repeat trips. A cached copy can be served at the edge rather than fetched from the origin for every request.
For example, a site might store its original image files at an origin. A CDN edge may serve a visitor a cached image; if that image is not available there, the CDN fetches it according to the configured delivery rules. The network architecture is a service, not one physical device.
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What content CDNs deliver
CDNs commonly deliver website assets such as HTML, JavaScript, stylesheets and images, as well as software downloads, video and streaming media. They can support websites, applications and media services.
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Not every request is a reusable static file. Dynamic content can be user-specific, so whether and how it is delivered through a CDN depends on the service and its configuration.
What a CDN can improve—and what it cannot guarantee
- Potentially lower latency: serving content nearer to a user can reduce the distance a request travels.
- Less repeated origin work: cache hits can reduce requests reaching the origin and may lower bandwidth use there.
- Support during traffic spikes: distributing delivery across edge locations can help handle demand. Providers also describe security capabilities that can help with some denial-of-service traffic.
These are possible benefits, not guaranteed outcomes. Performance depends on user location, whether content can be cached, cache settings and provider routing. A CDN does not automatically make every page faster, eliminate origin traffic, ensure uptime or provide complete protection from attacks.
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CDN services and provider architectures
Cloudflare’s CDN, Amazon CloudFront and Google Cloud CDN are examples of CDN services. Their designs and integrations are provider-specific, not requirements for all CDNs. For example, Google documents Cloud CDN alongside external Application Load Balancers and describes Cloud Storage as an origin option for a backend bucket setup.
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The right fit depends on the workload rather than the label “CDN” alone. Consider:
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- where your users are located;
- which files or requests can be cached and how frequently content changes;
- whether the service can handle your dynamic-request needs;
- how it integrates with your origin and supports cache controls;
- your security requirements, support needs and total cost.
Provider options alone do not establish which service is fastest or least expensive for a particular site. A meaningful choice requires comparison against the site’s traffic, content and configuration.
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