> The issue, IIRC, has to do with the minimum size of an Ethernet frame,
> the speed at which the frame propagates down the physical wire, and the
> need for all devices to be properly able to sense a collision.
[...]
Exactly. A switch divides the collision domain. The max
edge-to-edge latency within a collision domain is strictly
limited for the reasons you describe. All ports on a hub are
still in the same collision domain, so adding a hub doesn't let
you start over when you're adding up max lengths.
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