31 lines
1.2 KiB
Markdown
31 lines
1.2 KiB
Markdown
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---
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tags: [networks, internet]
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created: Sunday, March 02, 2025
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---
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# a0ab0bfb_network_layer_clarification
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I have difficulty understanding the places at which the different layers of the
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TCP/IP model of the Internet reside and their spatiality in terms of the overall
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system. These are some clarifying remarks.
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All layers exist on every device involved in the communication process. But not
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all layers are accessed by every device in the overall transaction.
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> While the entire encapsulated packet travels across the internet, different
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> devices interact with different layers of that packet based on their role in
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> the network.
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The server and client access data at all layers:
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- [Application](Application_Layer_of_Internet_Protocol.md)
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- [Transport](Transport_Layer_of_Internet_Protocol.md)
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- [Internet](Internet_Layer_of_Internet_Protocol.md)
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- [Link](Link_Layer_of_Internet_Protocol.md)
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This is because the data must be composed on the device, a route planned and
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then sent accross the network where it is processed at the local network layer.
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Routers however only care about routing the data, forwarding packets based on
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their IP addresses, they only process data up to the Internet Layer.
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