[ACCEPTED]-Are we using TCP/IP or OSI in internet?-osi

Accepted answer
Score: 19

The internet is based on TCP/IP which is 6 a "simplified" implementation 5 of the theoretical OSI model. Maybe it's 4 even better to say TCP/IP was inspired by 3 the OSI model, since it does not really 2 match up on closer review.

More info here:

http://en.wikipedia.org/wiki/OSI_model#Comparison_with_TCP.2FIP_model

and 1 here:

http://en.wikipedia.org/wiki/TCP/IP_model#OSI_and_TCP.2FIP_layering_differences

Score: 8

When i was searching the answer, even i 32 found it dificult to understand as the answers(even 31 if correct) are not exactly matching the 30 doubts in the question.

The question is actually 29 regarding the differnce between OSI model 28 and TCP/IP model and not TCP/IP protocol 27 which the answers are based on. A person 26 who doesn't know the difference will get 25 confused or not get satisfied with the answer 24 at all. I thought i will try to answer this 23 question with little more explanation.

Sorry 22 for all the above blah blahs .. Here is 21 the answer :

TCP/IP model was formed by DoD( Department 20 of Defence ) which came almost 10 years 19 earlier than OSI model and is defined with 18 4 layers as TCP and IP are the two protocols 17 just like FTP, UDP, SNMP, SMTP, Telnet, etc. It 16 was also called Internet Model. But i know the name itself is confusing. The layers 15 were not defined properly as they were just 14 based on protocols.

But after some research 13 the layers were again got redfeined and 12 OSI model shows us 7 layers which should 11 be the way of implementation of any communication.

TCP/IP 10 model had lots of issues like Transport 9 Layer doesn't guarantees the delivery of 8 packets, doesn't have a seperate Presentation 7 layer, replacing protocol is not easy as 6 they are not hidden unlike OSI model and you bet thats how OSI model came into existence

Now 5 as both are just models, in real world we 4 just worry about protocols as thats how 3 the things are implemented. So OSI model 2 is a reference on how we use internet today 1 and not the TCP/IP model.

Score: 3

The ISO/OSI model is, essentially, a theoretical 2 construct.

TCP/IP is roughly an implementation 1 of it.

Score: 3

TCP/IP or UDP/IP are just protocols of Internet. They 28 are in the 4th Layer of OSI. TCP or UDP 27 are used to determine what kind of connection 26 is to be established whether Connection-Oriented 25 or Connection-Less.

Connection Oriented which 24 uses TCP/IP protocol is used when there 23 is a need to establish a session and where 22 lost packets have to be retransmitted if 21 lost like when you use email, you dont want 20 to send a mail with uncertainty of whether 19 the mail will reach its destination or not 18 and moreover with uncertainty of sending 17 incomplete mail with lost packets.

Connectio-Less 16 which uses the UDP/IP protocol is used when 15 you dont want waste time on establishing 14 a connection and you dont want to retransmit 13 the lost packets as the latest packet is 12 more necessary to reach the destination 11 like when using chat, you dont want to resend 10 the old packets or data later or else it 9 will be like you are talking on some other 8 topic and the earlier packet reaches later 7 out of nowhere. Same can be said for buffering 6 of a video.

Hope it clears your doubt. For 5 further queries google the uses of TCP/IP 4 and UDP/IP and do go through the OSI model 3 once and try to understand what each layer 2 does and there contribution in transmission 1 of data packets.

Score: 2

The Internet uses IP v4, which is part of 13 the TCP/IP model.

The TCP/IP model was evolved 12 directly from the US Defense Department's 11 ARPANET programme. The first TCP/IP version 10 was determined in 1974. The version 4 specification 9 was published in 1981 and declared standard 8 for US military use the following year:

https://en.wikipedia.org/wiki/Internet_protocol_suite

The 7 OSI model was defined by the ISO and published 6 in 1984.

Therefore, TCP/IP is not an implementation 5 of OSI, although they are similar. Both OSI 4 and TCP/IP are reference models. TCP/IP 3 is an older reference model, and OSI model 2 is a new standard that other models often 1 don't fit neatly into.

https://en.wikipedia.org/wiki/OSI_model

Score: 1

OSI model is a reference model to indicate 7 how the communication between the various 6 devices takes place. While TCP/IP is not 5 a model,it is a set of protocols that governs 4 the flow of information across the networks..Conceptually 3 it is based on the OSI model only that is 2 why sometimes few people term it as TCP/IP 1 model also.

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