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  • Ankur Sood thinks this is interesting:

In a fully switched network, each switch port represents a separate collision domain, if half-duplex operation is used. You can totally eliminate all collision domains by configuring full duplex, provided of course that each device supports full-duplex 10-Mbps or 100-Mbps operation. Thus in Figure 2-3, if the router ports are working at full-duplex operation, no collision domain exists between the router and bridges, assuming of course that the connected bridge ports are also operating in full-duplex mode.

From

Cover of CCNP Self-Study CCNP Practical Studies: Switching

Note

Collision domain