I have two pc's both 100Mbit NICs connected to a 100Mbit router. Connected to the router is a 20 Mbit cable modem.
Now if I transfer a file from pc A to pc B I get 99% network utilisation. Which is fine. But if I initiate a download on pc B network utilisation drops to 50% ( full 20 Mbit on the cable modem but only around 30Mbit for the file transfer between pc A and PC B)
I would have thought the network utilisation would still be 100%? ( 20% for cable modem and 80% on the file transfer)
I've checked and everything is set for 100Mbit full duplex