OSI (Open Systems Interconnection) Model

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OSI (Open Systems Interconnection) model

Brief of History
Open Systems Interconnection (OSI). OSI model was introduced in the late 1970s which was proposed by British Standards Institute to the International Organization for Standardization (ISO) that to define communication infrastructure for distributed processing a standard architecture was needed. Most the design of OSI was done by a group at Honeywell Information Systems, headed by Mike Canepa, with Charlie Bachman as the principal technical member.
Introduction
OSI model served for the purpose to show there is a way to communicate different type of systems with different logic of underlying hardware and software through without the need to change the systems specifications. OSI model
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OSI provides layer functioning and the functions of all the layers while TCP/IP model is more based on protocols where the protocol are not flexible with other layers.
2. In OSI model the transport layer guarantees the delivery of packets while TCP/IP model the transport layer does not guarantees delivery of packets.
3. OSI model follows horizontal |approach while TCP/IP model follows vertical approach.
4. OSI model has a separate presentation layer while TCP/IP |does not have a separate presentation layer
5. OSI is a general model where it can be use in other application while TCP/IP model cannot be used in any other application.
6. OSI model is a reference model while TCP/IP is an implementation of OSI model
7. OSI model can fit some protocol but it have a problem of fitting the protocols in the model while TCP/IP model does not fit any protocol
8. OSI model have hidden protocols and where it can be replace easily as the changes in technology while replacing protocol TCP/IP is not
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OSI model defines services, interfaces and protocols very clearly and makes clear distinction between them while TCP/IP did not clearly separated its services, interfaces and protocols.
10. OSI model has 7 layers while TCP/IP model has 4 layers
12. The OSI model is bottom to up process of network connection whereas the TCP/IP is the top to bottom process structure for internet purpose.
13. OSI model is developed by International Organization for Standardization (ISO) while TCP/IP is created by U.S. Department of Defense
14. OSI model represents ideal while TCP/IP models represents reality in the world
15. Network layer of OSI model allow connection oriented and connectionless service while Network layer in TCP/IP model only provides connectionless
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