Distribution System
Distribution System is the set of surrogates (or caches) which serve actual content
- Simplified web server (i.e. no CGI, etc)
- Surrogates are exist in various parts of Internet
- Key differentiator between CDNs
If object does not exist at surrogate, it is retrieved from origin server on demand (in-line or later)
- Configured with <origin server, host header> pairs
Surrogates must have method of obtaining a “content signal” to control content