Discussion
How many collision domains are created when you segment a network with a 12-port switch?
Answer: D
Correct answer: 12
Every port on a switch is its own collision domain, which is exactly what distinguishes a switch from a hub: frames are forwarded only towards the port where the destination MAC address resides, so two conversations on different ports never collide. Twelve ports therefore give twelve collision domains, while all twelve remain in one broadcast domain unless VLANs are configured.
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