Comment by strictnein
2 hours ago
If you just look at the largest 4 of those, you'd have 100Tbps of traffic to monitor, with an average throughput of roughly half of that.
That's ~540PB ((50 Tbps / 8 bits) * 86400 seconds/day) of traffic a day with just those four. Add in the rest and you're likely talking ~Exabytes of data each day. And that has to all be processed on site.
If someone wants to argue that the NSA is in these facilities I'd be 100% onboard. But inspecting it all would be nearly impossible, let alone capturing it all and sending it back to some datacenter somewhere, which is a physical impossibility.
That's nothing a rack full of fast switches can't handle. A rack full of fast switches already does handle it - where do you think the original copy came from?
They will get a copy of the whole feed, but not store all of it - they will have heuristics for selecting interesting traffic.