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Two computers cannot ping one another - both connected to the same switch

I've got two physical computers which are connected to the same unmanaged switch. Said switch is connected to a server handing out IP addresses and acting as a gateway. This works fine. Clients that ...
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What happens when an ARP Request arrives to an Ethernet switch?

I remember reading somewhere that switches defined "data link layer broadcast domains": that is, data link broadcasts from one network connected to the switch are not forwarded to the others. If this ...