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Just want to also note, beside hosts normally dealing with bytes/sec and networks bits/second, there are often many layers of overhead between the network's bits/second and what you might see on a host for bytes/seconds. There's L2 protocol overhead (e.g. Ethernet), L3 protocol overhead (e.g. IP), L4 protocol overhead (e.g. TCP) and even other layers of overhead (e.g. FTP, CIFS, SMB, etc.).
Also, when copying large files between hosts, you can bump into physical limitions of the hosts, such as disk drives might not be able to sustain network high speed (even with modern hosts, it can be issue when you're dealing with gig interfaces).
