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OSI model:
1) It has7 layers.
2) Transport layer guarantees delivery of packets.
3) Horizontal approach.
4) Separate presentation layer.
5) Separate session layer.
6) Network layer provides both connectionless and connection oriented services.
7) It defines the services, interfaces and protocols very clearly and makes a clear distinction between them.
8) The protocols are better hidden and can be easily replaced as the technology changes
9) OSI truly is a general model.
10) It has a problem of protocol filtering into a model.
TCP/IP:
1) Has4 layers.
2) Transport layer does not guarantee delivery of packets.
3) Vertical approach.
4) No session layer, characteristics are provided by transport layer.
5) No presentation layer, characteristics are provided by application layer.
6) Network layer provides only connection less services.
7) It does not clearly distinguishes between service interface and protocols.
8) It is not easy to replace the protocols.
9) TCP/IP cannot be used for any other application.
10) The model does not fit any protocol stack.
We have to understand these models to know the process of data transfer and to identify the root cause of any problem and to better understand what will be the probable troubleshooting of any problem.
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