universal

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Youtube Server Cache

Downloading a video from Youtube, I noticed the link contained the name of my ISP, Comcast.

My question is, are Youtube video cache servers located in Youtube facilities, rented from ISPs, or do ISPs like Comcast cache videos for playback themselves? If so, does that mean Comcast/NBCUniversal has the ability to directly block or modify content for their ISP subscribers?

The video I downloaded was served from:

o-o.preferred.comcast-sjc1.v4.lscache7.c.youtube.com

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