OSI Model question

I am trying to visualize the OSI model but am having some confusion.

I don't understand this because first of all, if we are going to follow the OSI hierarchy (but starting from the Network layer and sending data outside of the LAN) I see the packets traveling in this order:

Transmitting- Router (Network layer) > Switch (Data Link layer) > Cables (Physical layer)

Receiving- Cables (Physical Layer) > Switch (Data Link layer) > Router (Network Layer) > Host (Tansport layer, Session Layer, Presentation Layer, Application Layer).

Shouldn't the data travel in this way:

Transmitting- Router (Network) > Cables (Physical)

Receiving- Cables (Physical) > Router (Network) > Switch (Data Link) > Host (Tansport layer, Session Layer, Presentation Layer, Application Layer).

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Comments

wastedtime

Not really sure what you are getting at in that post but maybe this picture will help.

The lines at the bottom are the path that the data would be taking through the network.

IRONMONKUS

I like that diagram, thank you. I never thought about the different layers that might take place within the switches and routers.

Technology1

Here's another one.

IRONMONKUS wrote: »

I like that diagram, thank you. I never thought about the different layers that might take place within the switches and routers.

Greenmet29

Wastedtime...That picture is pure genius. I understood the way that data passes through the network already, but this diagram reinforced what I already thought I knew! Thanks!

bencmcb

This was very helpful. Thank you.

Is the Network layer not being used when data is traveling within a LAN?

Greenmet29

It is, but not at the switch. When the receiving node gets it, it check the destination network layer address (IP Address) and if the packet belongs to that node, it strips the network layer header off and passes it to the transport layer. If it doesn't (could be a broadcast or unknown unicast), it discards the packet.

hermeszdata

Greenmet29 wrote: »

It is, but not at the switch. When the receiving node gets it, it check the destination network layer address (IP Address) and if the packet belongs to that node, it strips the network layer header off and passes it to the transport layer. If it doesn't (could be a broadcast or unknown unicast), it discards the packet.

This will make more sense once you understand LAN switching and how switch functionallity!