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Q:
"since layer 3, conceptually, ia about routing/switching packets between collision domains." (Hmmmmmmm...I'm not so sure about this statement...)
Collision domains are the connected physical network segments where collisions can occur. (Comes directly from the Cisco official curriculum)

Why do you insist on using the term "collision domain" ? I ask this question because ARP operation uses a broadcast function by which to facilitate resolution and the only device that I know of that blocks broadcasts by default are routers or RPMs. Moreover, a collision domain is in many respects a concept based on the physical limitation of the physical media. Limitations are placed on the physical media based on the physical aspects of the media and the encode signaling hence the 5-4-3 rule or more precisely according to Cisco the 5-4-3-2-1 rule. The basic CSMA/CD concepts are what motivated the following rules.

Standard 5-4-3 rule:
5 - segments (physical)
4 - maximum of 4 repeaters (physical layer device)
3 - maximum of 3 populted segments

Cisco's conceptual expansion of the 5-4-3 rule as the 5-4-3-2-1 rule:

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