Topic- Osi vs Tcp

7/31/2019 Topic- Osi vs Tcp

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Presented by Meet N Shah WRO-041166Vinit P Doshi WRO-0396598Centre Name- Thakur HouseBatch Timing-8am to 12pmBatch Commencement Date-21st may 2012

Group leader-Meet (8080188684)


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This presentation would discuss somecomparison and contrast between the 2main reference models which uses theconcept of protocol layering

Open System Interconnection Model (OSI)

Transport Control Protocol /InternetProtocol (TCP/IP)


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SEVEN LAYERS OF OSI


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The (commonlyknown as ) is the setof communications protocols used forthe Internet and other similar networks

It is named from two of the most importantprotocols in it:

the Transmission Control Protocol (TCP) and the Internet Protocol (IP), which were the first two

networking protocols defined in this standard.


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OSI TCP/IP

Application (Layer7) Application

Presentation (Layer6)

Session (Layer 5)

Transport (Layer 4) Transport (TCP/UDP)

Network (Layer 3) InternetData Link (Layer 2)

Physical (Layer 1) Subnet


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OSI TCP/IP

Data Link (Layer 2) Subnet

Physical (Layer 1)

1. Data Link/Physical vs Subnet

The Data Link Layer transforms a stream of raw bits(0s and 1s) from the physical into a data frame

The typical role of the physical layer is to transform

bits in a computer system into electromagnetic (orequivalent) signals for a particular transmission medium(wire, fiber, ether, etc.)


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These 2 layers of the OSI corresponddirectly to the subnet layer of the TCP/IPmodel.

Majority of the time, TCP/IP model does

nothing, it will vary from host to host andnetwork to network Since these two layers deal with functions

that are so inherently specific to eachindividual networking technology, the

layering principle of grouping themtogether related functions is largelyirrelevant.


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OSI: connectionless and connection-oriented services; TCP/IP: connectionless.

Connectionless Network Service

Internetworking Protocols

Internet (IP) Addresses OSI Network Layer Addressing


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It takes the information into individualpackets

Provide a signaling service for the remote

node Transport protocols mark packets with

sequencing information

To acknowledge the receipt of a packet

Provide multiple application processes toaccess the network by using individual localaddresses to determine the destinationprocess for each data stream


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The features of OSI and TCP defined atTCP/IP Transport Layer correspond to manyof the requirements of the OSI TransportLayer--the session layer of OSI

The TCP/IP and OSI architecture modelsboth employ all connection andconnectionless models at transport layer.

However, the internet architecture refers tothe two models in TCP/IP as simplyconnections and datagrams.


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OSI TCP/IPApplication (Layer 7)

Presentation (Layer 6) Application

Session (Layer 5)

Session Layer: In TCP/IP, itscharacteristics are provided by theTCP protocol (Transport Layer)

Presentation Layer: In TCP/IP, thisfunction is provided by theApplication Layer.


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Implementation of the OSI model placesemphasis on providing a reliable datatransfer service, while the TCP/IP modeltreats reliability as an end-to-end problem

Each layer of the OSI model detects and

handles errors, all data transmitted includeschecksums. The transport layer of the OSImodel checks source-to-destinationreliability

In the TCP/IP model, reliability control is

concentrated at the transport layer. Thetransport layer handles all error detectionand recovery.


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http://www.buzzle.com/articles/tcpip-model-vs-osi-model.html

http://www.cse.wustl.edu/~jain/cse473-05/ftp/i_2int/sld020.htm

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Topic- Osi vs Tcp