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Windows 7: Protocol model question

14 Dec 2011   #1

Windows 7 Ultimate 64 bit
Protocol model question

Hi all,

I realise this isn't a question just Win7 related but I am trying to wrap my head around this and this forum is always very good at answering my questions.

I am studying about the OSI protocol model at the minute and am trying to understand what is probably a very basic thing that I have twisted in my head.

For transferring data across networks, data is first input using the app layer of the TCP/IP Model, then is encapsulated into segments for the Transport Layer, packets for the Internetwork Layer and Frames for the Network Access Layer.

I was just looking at routers and how they take a packet and forward it on. If the data travels down the entire protocol stack then surely a frame is the PDU that arrives at the router?

Sorry if this is garbled but any help would be welcome.


My System SpecsSystem Spec
14 Dec 2011   #2

Windows 7 Ultimate 64 bit

Ah doesn't matter, I think I have it.

Frames are decapsulated and re-encapsulated at every device before it is sent on to the next hop with a different trailer and header on it.
My System SpecsSystem Spec
14 Dec 2011   #3

W7 Ultimate SP1, LM18.3 MATE, W10 Home, #All 64 bit

That's correct.
The source and destination MAC addresses (in the frame) change at each router.

if you are a Cisco Networking Academy student, try downloading Cisco Packet Tracer.
You can get it from Cisco.

It is a network simulator.
It comes with networking tutorials and scenarios.
You can view network data information as it travels through a simulated network.
My System SpecsSystem Spec

14 Dec 2011   #4

Windows 7 Ultimate 64 bit

Yeah messin around with it now thanks!
My System SpecsSystem Spec

 Protocol model question

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