System Design Fundamentals
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CDN Architecture

A CDN has to answer three questions before it can serve anyone. Where do the servers go? How does a request find the right one? And how long does a cached copy stay valid?

This lesson takes them in that order, then looks at how the servers are wired together.

Points of Presence and Edge Servers

A Point of Presence (PoP) is a physical location holding a group of edge servers inside the CDN's network. PoPs are placed across geographic regions so that a user is never far from one.

Each PoP usually contains several edge servers rather than one

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Vaishali Behere

Vaishali Behere

· 2 years ago

Visual digrams would really help. Plain text makes it hard to visualize