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Notes -
I don't think you'll see a true 'dumb switch' (technical term 'hub') in ethernet from a major store; I haven't seen a new one since back when 10/100mbps switches were just phasing in. But they definitely existed, and it wasn't uncommon for one person to be able to bog down an entire intranet.
In the modern day, the distinction between 'dumb' and 'smart' switches is usually going to emphasize 'smart' switches as having optional routing functionality, (aka 'layer 3 switching'). This technically means that the layer 3 switch has one or more ports that can be configured into a router mode, though in practice it'll be missing a lot of other functionality you'd expect from a small home or office router (almost always missing NAT/PAT, usually not having DHCP or DNS).
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