A modern cut thru switch typically has one ASIC for a group of ports, and that ASIC handles all the traffic. If the traffic for all of those ports is greater t

A modern cut thru switch typically has one ASIC for a group of ports, and that ASIC handles all the traffic. If the traffic for all of those ports is greater than what the ASIC can handle, you'll have buffering and/or drops. That being said, the ASIC can typically handle line rate on all the ports. You could have 10G input and fan it out to 10G output on all the ports with no drops, but if there is other cross port traffic, something could get dropped.