The TCP IP model is a model with four layers, which is for both modeling current Internet architecture,
as well as providing a set of rules that govern all forms of transmission over a network.
DARPA, an agency of the United States Department of Defense, created it in the 1970s.
This model was being made at the same time the Ossi model was created.
The TCP IP model is not the same as U.S. high model, however, it was influenced by the model, which
is why many of the names of the different layers are the same.
So we can simply say that the TCP IP reference model represents reality in the real world, whereas
the Ossi reference model represents an ideal, OK?
So these are the main differences of the TCP IP reference model.
The three top players in the USA model, that is the application layer, the presentation layer and
the session layer are not distinguished separately in the TCP IP model, which only has an application
layer above the transport layer.
TCP IP corresponds to Ossi layer for the transport layer.
IP corresponds to a subset of ozone layer three, the network layer.
TCP IP makes no prescriptions as to the link layers below IP, while Ossi specifies two layers.
The physical address, commonly the Mac address, which is located in a special field in the datalink
layer header, changes as a packet passes from one device to another, for example, from the source
PC to a switch to a router to another switch, and then finally to the destination PC.
However, the original IP source and destination addresses do not change when transiting the network
because the packet is stripped of its layer three header only when it goes beyond a router.
When it stays within the same land, it only passes through switches which decaf isolated at the layer
to heter containing the Mac address.
So as a result, the header changes as the packet is re encapsulated, as does the Mac address Fields'.