How many collision domains are created when you segment a network with a 12-port switch?

When you segment a network using a 12-port switch, each port on the switch creates its own collision domain. This is because a switch operates at the data link layer of the OSI model and intelligently forwards frames only to the port where the destination device is connected, effectively isolating the traffic between each pair of devices connected to the switch. Therefore, with 12 ports on the switch, there are 12 separate collision domains created—one for each port. This segmentation reduces the chances of collisions occurring, as devices connected to different ports can transmit data simultaneously without interfering with each other. Hence, the correct answer is that there are 12 collision domains created in this configuration.