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CDN

Description

A CDN (Content Delivery Network) is a distributed network of servers that helps deliver website content more quickly by serving files from a location closer to the visitor. Instead of every request going to one origin server, a CDN can cache and deliver assets such as images, CSS, JavaScript, and sometimes full pages. This reduces load times, improves reliability during traffic spikes, and can reduce strain on your main server. CDNs are especially useful for websites with international audiences or media-heavy pages. The impact depends on what is cached, how often content changes, and how the CDN is configured.

Why it Matters?

  • Improves load speed by serving content from nearer locations.
  • Helps handle traffic spikes more smoothly.
  • Reduces strain on your origin hosting server.
  • Can improve reliability by distributing delivery across multiple servers.

Key Factors

  • Caching rules: Determines what files are stored on edge servers and for how long.
  • Geographic coverage: More edge locations can improve delivery for wider audiences.
  • Origin configuration: Correct setup ensures the CDN pulls and updates content reliably.
  • Cache invalidation: Controls how updates are pushed when content changes.
  • Security features: Many CDNs include protection features like DDoS mitigation and WAF options.

Best Practices

  • Cache static assets such as images, CSS, and JavaScript.
  • Set clear cache rules and expiry times.
  • Use HTTPS end-to-end with correct certificate settings.
  • Test cache purge processes after site updates.
  • Monitor performance before and after enabling a CDN.

FAQs

What is a CDN?

A CDN is a network of servers that delivers website content from locations closer to visitors to improve speed and reliability.

What does a CDN cache?

Commonly static files like images, CSS, and JavaScript, and sometimes full pages depending on configuration.

Do small websites need a CDN?

Not always, but it can still help with speed and reliability, especially for international audiences or media-heavy sites.

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