Which impact does adding a Layer 2 switch have on a network?

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Question:
Which impact does adding a Layer 2 switch have on a network?

an increase in the number of dropped frames
an increase in the size of the broadcast domain
an increase in the number of network collisions
an increase in the size of the collision domain

Explanation: Adding a Layer 2 switch to a network increases the number of collision domains and increases the size of the broadcast domain. Layer 2 switches do not decrease the amount of broadcast traffic, do not increase the amount of network collisions and do not increase the number of dropped frames.

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