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Compared to a hub, are there more or fewer collision domains on a securely configured layer 2 switch?
Fewer
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In generally all switch configurations, each port connected to a device/endpoint is its own collision domain. On switches, destination traffic is passed only to the specific port of the device it was sent to based on the CAM table (IP-to-MAC pairs) avoiding the possibility entirely of traffic collisions. Because unicast traffic in switches are not broadcast to all ports, this separation prevents collisions, however, in hubs there is no CAM table and all traffic destined for any device is broadcast to all ports, therefore hubs have a single collision domain. This feature of hubs makes passive sniffing much easier to do, but finding hubs in a production network is somewhat rare.
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