Need help understanding the OSI model

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I am trying to get a clearer understanding of the OSI model.

Say you have a home LAN connected to your 3-in-1 modem/router/switch.

So a pc on this LAN requests say www.somesite.com. So the PC sends a packet header to the

switch containing its MAC address, LAN IP and the websites address, the switch stores the

MAC address and hence remember this MAC address in its MAC table in it's memory.

The switch then forwards this packet/header to the router then uses NAT to route between LAN and internet ips and takes this header and sends it to

to the modem to be modulated and the modem then send this header to the websites server via the internet and somewhere in this process the internet ip is added to the header.


The website packets start coming back into the modem(which demodulates the signal) and

passes the packet and header back to the router in packets of about 64kb at a time or something, the router translates the internet ip back to the LAN subnets and passes the packet to the switch, the switch reads the MAC address in the header and passes the packet to the corresponding PC.

How much of this is correct?

 

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It is mostly correct. But where does OSI come in this?

(The 'real' Internet address is substituted by NAT for your local one.)

There is, of course, a lot more complexity involved. In particular you don't mention the DNS lookup that translates the website name into an Internet IP address.

Harry.

 

See if this helps you understand better