Answer Posted / vijay

TCP/IP is a protocol stack used for data transmission from source to destination.
in the physical layer all the physical connections like LAN cards, cables etc will b there which will send data in the form of bits. layer 2 operates with frames where the switches comes into picture.
in the network layer which operates on packets.routing takes places, routers are the devices used for this.
transport layer is above the network layer and it uses mainly TCP/ UDP for transport of data.
the application layers is on top of this layer.

application layer
|
transport layer[tcp/udp]
|
network layer[routers]
|
datalink layer[switches]
|
physical layer[Network Interface card, cables etc]

for any transfer of data between 2 systems this TCP/IP stack comes into picture, whether it is file transfer or uploading something,sending an email etc. any application based on web will use TCP/IP

hope this helps

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