juniorCDN
What is the difference between Pull and Push CDN?
Updated Apr 28, 2026
Short answer
Pull CDNs automatically fetch content from your server, while Push CDNs require you to manually upload content.
Deep explanation
CDN architecture involves a network of proxy servers. When a user requests content, the DNS routes them to the nearest Edge server. This minimizes the physical distance data travels (the 'last mile'), reducing round-trip time (RTT). Key protocols like TCP and TLS are terminated at the edge, further speeding up the handshake process.
Real-world example
A user in Tokyo accessing a website hosted in New York. Without a CDN, the request travels across the ocean. With a CDN, the user gets the image from a Tokyo-based edge server.
Common mistakes
- Thinking a CDN replaces a web host
- it actually acts as a performance layer on top of it.
Follow-up questions
- How does DNS-based routing work in CDNs?
- Can static and dynamic content both be served via CDN?