For a DNS-only service provider, it seems like 1.2Tbps could be 1000x normal traffic. But Akamai claims 30Tbps+ is their routine traffic[1]. Some have commented that this DDOS questions consolidation around cloud providers, but I think it will cause consolidation among service providers. You can no longer be a critical service provider if you don't have the capacity to absorb attacks like this.

http://www.csoonline.com/article/3123797/security/some-thoug...