Which device does not separate collision domains?

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Collision domains are the parts of a network where data packets can collide if two devices transmit at the same time. A hub simply repeats electrical signals to every port without paying attention to the destination, so all devices connected to that hub share one shared medium. That means there’s only one collision domain for the entire hub network, and any transmission could collide with any other, no matter which port it comes from.

Switches, on the other hand, create separate collision domains for each port. Each device connected to a switch has its own dedicated collision domain on that port, so collisions are confined to the single device–switch link. Bridges work similarly to switches by segmenting collision domains between network segments, and routers extend that idea further by separating collision domains at each interface (and they also separate broadcast domains).

Thus, the device that does not separate collision domains is the hub.