The relationship between the physical layer and TCP/IP and Ethernet.

[speedy]

I've seen this question around on a few practice exams and revision tests.

Explain the relationship between the physical layer and both Ethernet and TCP/IP. Indicate the layers that these different protocols operate on in you answer.

I understand that the OSI model is just a model, and in actual fact there is no definite layer that a protocol operates on. I've read quite a lot on the OSI model but still don't know how to answer this question in the way that VCAA would like it answered. 

[dida]

Ethernet & TCP/IP use bits/bytes to transmit data over a network/over the internet. The physical layer provides these bits/bytes. Without the physical layer providing these bits/bytes, Ethernet & TCP/IP wouldn't be able to function as they require them for packet transition.

[dida]

and then you would indicate that that Ethernet lies on layer 2, TCP is on layer 4 and IP is on layer 3

[dida]

and then you could indicate that without the physical layer, none of the subsequent layers above it would be able to function.

[speedy]

Ethernet & TCP/IP use bits/bytes to transmit data over a network/over the internet. The physical layer provides these bits/bytes. Without the physical layer providing these bits/bytes, Ethernet & TCP/IP wouldn't be able to function as they require them for packet transition.
and then you would indicate that that Ethernet lies on layer 2, TCP is on layer 4 and IP is on layer 3
and then you could indicate that without the physical layer, none of the subsequent layers above it would be able to function.

I understand that the physical layer is the base to all subsequent layers, but then again, every layer is the base for all layers above it. Every layer is needed for every other layer to work.
And doesn't the data link layer convert the data into bits, which the physical layer then converts into physical signals - voltages, radio waves, light?
I guess the way I would answer the question is that TCP/IP chooses the path for the data to travel on, and the physical layer actually sends it on that path...

[darvell]

Go check MJRomeo81's jesus post on the OSI Model.

One post to rule them all - The definitive guide to the OSI and TCP/IP Model

[Ya Habibi]

You just need to identify what the physical layer is and how ethernet and tcp/ip relate to it, by stating their physical wirings, cables, equipment used throughout that first layer.