When I was working at Rio Tinto in the New South Wales Hunter Valley. I used NTttcp to test network switch throughput on some Cisco Switches. (From memory they had lost some ports due to a lightning strike)

I had forgotten about it for years but was reminded of it during study for the AZ-301

So to keep the memory alive here is the link: https://gallery.technet.microsoft.com/NTttcp-Version-528-Now-f8b12769