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Latency kills...and Ethernet uses exponential backoff.

More specifically TCP uses exponential backoff. Ethernet will happily keep drowning you in packages at line rate, if I'm not mistaken.

CSMA/CD does use exponential back off, though I'm not sure if anyone is still using it.

This is only for half-duplex ethernet communication so no one apart from some archaic systems.

Like WiFi?

CSMA/CA but close.

There is also 10Base-T1 which is a rather recent addition.

> Ethernet will happily keep drowning you in packages at line rate, if I'm not mistaken.

It's a physical layer, so yeah, of course it will.