CDNs and domains

Posted by Martind on Stack Overflow See other posts from Stack Overflow or by Martind
Published on 2010-03-25T23:35:34Z Indexed on 2010/03/25 23:43 UTC
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dns

Hi all!

A lot of big websites (facebook etc) are settings up CDN's for their content. Now I notice, that these CDN's are not always on the original domain.

Example: Facebook pictures are on "photos-a.ak.fbcdn.net"

Why is that? Is there a performance-gain in not having lots of subdomains on the "primary" domain (facebook.com)

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