100Gbps is the fastest ethernet connection that you can buy (for six figures). So that is always going to be a limitation on the router. They can be aggregated

100Gbps is the fastest ethernet connection that you can buy (for six figures). So that is always going to be a limitation on the router. They can be aggregated into larger links but I think that is pretty uncommon. The internet is made up of lots of connections between ISPs not a few giant ones, and you can attack each one of those links separately.