blocks|key|611232|text|因特网是基于TCP/IP的，TCP/IP是OSI理论模型的“简化”实现。也许更好的说法是TCP/IP受到OSI模型的启发，因为仔细观察它并不能真正与之匹敌。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|611233|更多信息请点击此处：|611234|http://en.wikipedia.org/wiki/OSI_model#Comparison_with_TCP.2FIP_model|offset|length|611235|还有这里：|611236|http://en.wikipedia.org/wiki/TCP/IP_model#OSI_and_TCP.2FIP_layering_differences|611237|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|0|0|1X|0|0|0|0|27|1|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@$F|W|G|X|1|Y]]|A|$]]|$1|H|3|I|5|6|7|Z|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|10|8|@]|9|@$F|11|G|12|1|13]]|A|$]]|$1|L|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|E]]|S|$5|O|P|Q|A|$R|K]]]]

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

More info here:

<a href="http://en.wikipedia.org/wiki/OSI_model#Comparison_with_TCP.2FIP_model">http://en.wikipedia.org/wiki/OSI_model#Comparison_with_TCP.2FIP_model</a>

and here:

<a href="http://en.wikipedia.org/wiki/TCP/IP_model#OSI_and_TCP.2FIP_layering_differences">http://en.wikipedia.org/wiki/TCP/IP_model#OSI_and_TCP.2FIP_layering_differences</a>

blocks|key|611693|text|ISO/OSI模型本质上是一个理论构造。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|611694|TCP/IP大致就是它的一种实现。|611695|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

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

TCP/IP is roughly an implementation of it.

blocks|key|611314|text|TCP/IP或UDP/IP仅仅是Internet的协议。它们位于OSI的第4层。TCP或UDP用于确定要建立哪种类型的连接，是面向连接还是无连接。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|611315|使用TCP/IP协议的面向连接是在需要建立会话并且丢失的数据包必须重新传输的情况下使用的，例如当您使用电子邮件时，您不想发送不确定邮件是否会到达其目的地的邮件，而且不希望发送带有丢失数据包的不完整邮件。|611316|Connectio-Less使用UDP/IP协议，当你不想在建立连接上浪费时间，并且你不想重传丢失的数据包，因为最新的数据包更有必要到达目的地时，就像使用聊天时，你不想稍后重发旧的数据包或数据，否则就像你在谈论其他话题，较早的数据包无处可及地到达较晚的位置。对于视频的缓冲也可以这样说。|611317|希望它能消除你的疑虑。为了进一步查询，谷歌使用TCP/IP和UDP/IP，并确实通过OSI模型一次，并试图了解每一层做什么，以及它们在数据包传输中的贡献。|611318|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

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

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

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

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

blocks|key|611334|text|OSI模型是一个参考模型，用于指示各种设备之间的通信方式。虽然TCP/IP不是一个模型，但它是一组协议，控制着networks..Conceptually上的信息流。它只是基于开放系统互连模型，这就是为什么有时很少有人把它称为TCP/IP模型的原因。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|611335|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

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

blocks|key|611363|text|当我搜索答案时，我发现很难理解，因为答案(即使正确)与问题中的疑问并不完全匹配。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|611364|问题实际上是关于OSI模型和TCP/IP模型的区别，而不是答案所基于的TCP/IP协议。一个不知道区别的人会感到困惑，或者根本不会对答案感到满意。我想我会尝试用更多的解释来回答这个问题。|611365|对于上面的那些废话我很抱歉..这就是答案：|611366|TCP/IP模型是由美国国防部(DoD)比开放系统互连(+OSI+)模型早了近10年形成的，它被定义为四层协议，即TCP和IP是与FTP、UDP、SNMP、SMTP、Telnet等协议一样的两种协议，也被称为因特网模型。但我知道这个名字本身是令人困惑的。这些层没有正确定义，因为它们只是基于协议。|611367|但是经过一些研究，这些层又被重新定义了，OSI模型向我们展示了7层，它们应该是任何通信的实现方式。|611368|TCP/IP模型有许多问题，如传输层不保证数据包的传递，没有单独的表示层，更换协议并不容易，因为它们不像OSI模型那样隐藏，你可以打赌OSI模型就是这样出现的|611369|现在，由于两者都只是模型，在现实世界中，我们只是担心协议，因为这是如何实现的。因此，OSI模型是我们今天如何使用internet的参考，而不是TCP/IP模型。|611370|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|S|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|V|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|O|$]]

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

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

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

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

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

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

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

blocks|key|4796511|text|国际标准化组织创建了开放式系统互连(OSI)参考模型，作为定义连接计算机的标准的框架。该模型于1984年发布，试图让整个世界以同样的方式思考计算机网络，并将其作为标准化人们通过计算机进行通信的实际协议的第一步。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4796512|国防高级研究计划局(DARPA)是美国国防部的一个机构，负责开发TCP/IP模型。美国TCP/IP模型有时被称为互联网模型，或者更少被称为DoD(Defense+of+Defense)模型。|offset|length|style|BOLD|4796513|TCP/IP模型描述了一组使计算机能够通过网络进行通信的特定网络协议的通用设计指南和实现。|4796514|entityMap^0|0|21|M|0|0|18|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|K|$]]

The International Organization for Standardization (ISO) created the Open Systems Interconnection (OSI) reference model as a framework for defining standards for connecting computers. Released in 1984, the model was an attempt to get the entire world to think about computer networking in same way, and was to act as a first step towards standardizing the actual protocols that people used to communicate via computers. 

The Defense Advanced Research Projects Agency (DARPA) is an agency of the United States Department of Defense responsible for the development TCP/IP Model. The TCP/IP Model is sometimes called the Internet Model or less often the DoD(United States Department of Defense) Model. 

The TCP/IP model describes a set of general design guidelines and implementations of specific networking protocols to enable computers to communicate over a network.

blocks|key|759722|text|互联网使用IP+v4，它是TCP/IP模型的一部分。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|759723|TCP/IP模型直接从美国国防部的ARPANET计划演变而来。第一个TCP/IP版本于1974年确定。版本4规范于1981年发布，并于次年宣布为美军使用的标准：|759724|https://en.wikipedia.org/wiki/Internet_protocol_suite|offset|length|759725|OSI模型由ISO定义，并于1984年发布。|759726|因此，TCP/IP不是OSI的实现，尽管它们是相似的。TCP和/IP都是参考模型。TCP/IP是一个较旧的参考模型，而OSI模型是一个新标准，其他模型通常不能很好地适应它。|style|BOLD|759727|https://en.wikipedia.org/wiki/OSI_model|759728|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|0|0|1H|0|0|0|V|1J|0|0|13|0|13|1|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@$F|10|G|11|1|12]]|A|$]]|$1|H|3|I|5|6|7|13|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|14|8|@$F|15|G|16|L|M]]|9|@]|A|$]]|$1|N|3|O|5|6|7|17|8|@$F|18|G|19|L|M]]|9|@$F|1A|G|1B|1|1C]]|A|$]]|$1|P|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|E]]|W|$5|S|T|U|A|$V|O]]]]

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

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

<a href="https://en.wikipedia.org/wiki/Internet_protocol_suite" rel="nofollow noreferrer">https://en.wikipedia.org/wiki/Internet_protocol_suite</a>

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

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

<a href="https://en.wikipedia.org/wiki/OSI_model" rel="nofollow noreferrer">https://en.wikipedia.org/wiki/OSI_model</a>

sorry for that question, but i've searched about that topic, and it's not really clear, they say that internet uses tcp/ip but sometimes they say that osi also is used! for example, UDP application, they dont use tcp/ip since it's not a tcp?!

please, can someone make it clear? mean; where is "exactly" OSI is used, and where is "exactly" TCP/IP is used!

Are we using TCP/IP or OSI in internet?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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对于这个问题我很抱歉，但是我已经搜索过这个话题，但并不是很清楚，他们说互联网使用tcp/ip，但有时他们说也使用osi！例如，UDP应用程序，他们不使用tcp/ip，因为它不是tcp?！有没有人能说清楚点？意思是；哪里是“确切”使用OSI，哪里是“确切”使用TCP/IP！

问我们在互联网上使用的是TCP/IP还是OSI？
EN

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问我们在互联网上使用的是TCP/IP还是OSI？EN