Q:
Here is how it works as a writer who is NOT dedicated to the resources and facts. They typically look to resources that they think are credible and write it as fact. Then there will be many people who will say that IT IS fact.
When I write I look at the RFCs, that really is the first and last. Other sources are great but do compare them to the RFCs.
Again, there is nothing in RFC 826 or 1180 that states that ARP is a Layer 2 OR Layer 3.
Although you are correct about CSMA/CD and 5-4-3-2-1 rules you have not looked deeply into Ethernet. When you do you will see that ARP applies its function to ethernet as a need....please see RFC 826 for this.
RFC 1180 really is the 2000 foot view of a packet from start to destination, which includes ARP.
To emphisize my earlier point....ARP fits into the DoD TCP/IP model originally and you and I are trying to make it fit into the OSI model. As you know it is not a direct comparison.
Here is the quest....Find a *standars* body (RFC, IEEE, and the like) that states that ARP is in fact on any layer of the OSI. Second, when it does mention a layer as if it is a layer from the OSI or TCP/IP model.
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