Is each switch port considered a collision domain?

Question

Layout

This question arose because of a dispute, maybe I don’t know correctly? Isn't every L2 switch port a broadcast domain?

Answer 1

Maybe so?

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And it would be better to make the star the background of the legend, i.e. without using the img tag

Answer 2

First of all, you are confusing terms. A collision domain is a group of nodes competing for the same transmission medium. A broadcast domain is a section of a network where broadcast messages can be transmitted.
The switch port provides a point-to-point connection, and the signal reception and transmission are separated either physically (100BASE-T) or by frequency (1000BASE-TX). Accordingly, no collision domain is formed, and there is no transmitter competition.
In this case, the port may or may not be included in the broadcast domain, depending on the switch settings.

Answer 3

You have a confusion in terminology - in the title you have a collision domain - a rare phenomenon that was relevant for Ethernet in the days of stupid hubs.
In the body of the question, you are asking about a broadcast domain - a logical section of a computer network in which all nodes can transmit data to each other using broadcasting at the data link layer of the OSI network model.
The broadcast domain will consist of the union of several collision domains.
In general, the answer is this - by the nature of Ethernet, each port in the switch is one collision domain (only there are no collisions in it now - there are no hubs) (but not a broadcast domain).
And through the switch, these collision domains are combined into broadcast domains - each VLAN has its own.