![]() Some choices are in disagreement with the way computers and software communicate. OSI model is not adapted at all to telecommunication applications on computer. At the implementation level, TCP/IP is much more optimized and effective.Ĥ. This model is also redundant (the flow control and the error control appear in most layers). The committee that wrote the standard even had to leave aside some technical points, like security and coding, so much it was delicate to preserve a well defined role to each layer completed with these extra technical points. The OSI model is in fact too complex to be effectively and properly implemented. Indeed, few programs can use or wrongly use the 7 layers of the model: the session and presentation layers are hardly used and on contrary the data link and network layers are often split into several sub-layers, since they are pretty complex. The gap between the concrete use (implementation) and the model is sometimes significant. ![]() ![]() Many LAN applications need very fast setup with each other but the connection mode transfer in OSI requires an agreement between 3 parties, users and the service provider, hence it is slow.ģ. Many LANs are powerful (high speed) and has low error rates, many applications do not need the data integrity provided by OSI.Ģ. In TCP/IP it is not clearly separated its services, interfaces and protocols.ġ. OSI model defines services, interfaces and protocols very clearly and makes clear distinction between them.ĩ. In TCP/IP replacing protocol is not easy.ĩ. Protocols are hidden in OSI model and are easily replaced as the technology changes.Ĩ. OSI model has a problem of fitting the protocols in the modelħ. The Network layer in TCP/IP model provides connectionless service.ħ. Network layer of OSI model provide both connection oriented and connectionless service.Ħ. TCP/IP model cannot be used in any other application.Ħ. TCP/IP does not have a separate presentation layerĥ. OSI model has a separate presentation layerĤ. In TCP/IP model the transport layer does not guarantees delivery of packets.Ĥ. ![]() In OSI model the transport layer guarantees the delivery of packetsĢ. TCP/IP model is more based on protocols and protocols are not flexible with other layers.Ģ. OSI provides layer functioning and also defines functions of all the layers.ġ. ![]()
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