Oct 2, 2013 Tweet COMMENTS2What’s The Difference Between The OSI Seven-LayerNetwork Model And TCP/IP? Lo u Frenz el | Electronic Design Comparing and contr asting the OSI and TCP/IP models of networking. Whether it’s wired or wireless, most data communications today happens by way ofpackets of information travelling over one or more net works. But before these ne tworks can work together, though, they must use a common protocol, or a set of rules for transmitting and receiving these packets of data. Many prot ocols have been develop ed. One of the most w idel y u sed is the Transmiss ion Control Protocol/Internet Proto col (TCP/IP). Also, a generic protocol model used in describing network com munications known as the Open System Interconnection (OSI) model is useful for comparing and contrasting different protocols. Table Of Contents • The OSI Model • TCP/IP • Summary• References The OSI Mode l Designated ISO/IEC 7498-1, the OSI model is a standard of the International Organization f or Standardization (ISO). I t is a general-purpose p aradigm for discussing or describing how computers communicate with one another over a network. Its seven- layered approach to data transmission divides the many operations up into specific related groups of actions at each layer (Fig. 1). RELATED Adver tisement Top Articles 1. 10 Essential Skills for EEs 2. What’s The Difference Betwee n Watts And Volt-Amperes? 3. What’s The Difference Betwee n Bit Rate And Baud Rate? 4. What’s The Difference Betwee n ATP G And Logic BIST? 5. What’s The Difference Betwee n The RS-232 And RS-485 Serial Interfaces? Commentaries and Blog s Why Were The “Prisoners” Discussing Wireless Charging ? by Paul Why tockPosted 1 day ago in London Calling 50 Years of BA SIC Programming by Lou Frenzel Pos ted 2 day s ago in Communiqué FPGAs Get A Performance/Reliability Lift From The Bumps by Paul Why tockPosted 1 w eek ago in London Calling Adver tisement Contributing Technical Expe rts HOME> LEARNING RESOURCES> WHAT’S THE DIFFERENCE BETWE EN…> WH AT’S THE DIFFERENCE BETWEEN THE OSI SEVEN-LAYER NETWORK MODEL AND TCP/IP? SHARE 1 Recommend Ethernet Chip Packs Hardwired TCP/IP Core And PHY» Many Core Systems Handle Network Process ing Chores » What’s The Difference Between HomePlug And G.h n? » What’s The Difference Between A Dipol e And A Ground Plane Antenna? » Electronic Design Eur ope Store Subscribe About Us Con ta c t Us RSS Advertisi ng Technologies News Markets Learning Res ources Community Companies Part Search REGISTER LOG IN
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8/12/2019 OSI Networking Model, TCP_IP _ What’s the Difference Between… Content From Electronic Design
1. In the OSI model, data flows down the transmit layers, over the physical link, and then up through the
receive layers.
The transmitting computer software gives the data to be transmitted to the applications
layer, where it is processed and passed from layer to layer down the stack w ith each layerperforming its designated functions. The data is then transmitted over the physical layer
of the network until the destination computer or another device receives it. At this point
the data is passed up through the layers again, each layer performing its assigned
operations until the data is used by the receiving computer’s software.
During transmission, each layer adds a header to the data that directs and indentifies the
packet. This process is called encapsulation. The header and data together form the data
packet for the next layer that, in turn, adds its header and so on. The combined
encapsulated packet is then transmitted and received. The receiving computer reverses
the process, de-encapsulating the data at each layer with the header information directing
the operations. Then, the application finally uses the data. The process is continued until
all data is transmitted and received.
All of the necessary and desirable operations required are grouped together in a logical
sequence at each of the layers. Each layer is responsible for specific functions:
• Layer 7 – application: This layer works with the application software to provide
communications functions as required. It verifies the availability of a communications
partner and the resources to support any data transfer. It also works with end
applications such as domain name service (DNS), file transfer protocol (FTP), hypertext
transfer protocol (HTTP), I nternet message access protocol (IMAP), post office protocol
(POP), simple mail transfer protocol (SMTP), Telenet, and terminal emulation.
• Layer 6 – presentation: This layer checks the data to ensure that it is compatible with
the comm unications resources. I t ensures compatibility between the data formats at the
applications level and the lower levels. I t also handles any needed data formatting or codeconversion, as well as data compression and encryption.
