Can you put multiple networks on a single, dumb, switch? For emample, could I use the same switch for machines on a 192.168.0.0 network and a 10.1.1.0 network at the same time?

Yes.

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Old post, we know. But we had the same question and found this post. The answer is not right although it looks very confident.

Really dumb switches can not do this (for example the 3COM 3C16471). Don't know what the criteria are.

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I have to disagree with you and agree with fur.

As to the exact topology of the question we don't know but a simple home or small office type of switch can easily have two networks running on it. For example you can have two computers in one private range and two more in another private range.

They would communicate based on mac addresses and the combination of ip and subnet and in some cases a gateway address. Don't mix up layers of communication. On the physical layer they can connect. To keep the next layers up the combo of subnetting works to keep communications.

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Jefro is spot on, - yes you can. The switch switches L2 frames, it cares not what is in them. What it will not do is allow these two networks to talk to each other, you still need an ip router for that, but both networks will coexist quite happily.

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