CDN: What It Is and When to Use It
Does your website feel slow when accessed from abroad? Or does your server get overwhelmed during high traffic? A CDN (Content Delivery Network) is the answer. Let's discuss this in depth.
1How CDN Works (Diagram)
User (Eropa)
User (Asia)
User (Amerika)
CDN Edge Servers
Caches static files (images, css, js). Users are served by the nearest Edge.
Origin Server
Data Center (Jakarta)
2What is a CDN?
A CDN is a geographically distributed network of servers (called Edge Servers or PoPs - Points of Presence). Its main job is to store cached copies of your website's static assets, like images, videos, CSS, and JavaScript.
When a user requests a file, the CDN detects their location and delivers the file from the physically closest CDN server, instead of going all the way to your main Origin Server.
3Use Cases: When to Use a CDN
1. Target Audiens Global
If your server is in Jakarta, visitors from the US will experience high latency (often >200ms). With a CDN, US visitors just fetch data from a CDN server in New York (latency <20ms).
2. Website Banyak Aset Media
E-commerce, news portals, or portfolios with hi-res images consume massive bandwidth on the main server. CDNs offload the heavy lifting of delivering these large files simultaneously from the nearest edge.
3. Mengurangi Biaya Bandwidth
Cloud providers like AWS or GCP charge high fees for outgoing data (egress). Since a CDN caches your data, requests to your origin server drop dramatically, slashing your cloud bill.
4. Perlindungan DDoS (Keamanan)
CDNs have massive network capacity (thousands of Tbps). If a DDoS attack occurs, the CDN absorbs the bot traffic at the Edge Server and filters it, keeping your Origin server safe and online.