TCP/IP Reference Model Host To Network Layer Transport Layer Application Layer Internet Layer.
Three-Layer Model
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Transcript of Three-Layer Model
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Three-Layer Model• Distributed data
communications involves three primary components:– Networks– Computers– Applications
• Three corresponding layers– Network access layer– Transport layer– Application layer
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Data Transmission• Application layer creates data block• Transport layer appends header to create PDU (protocol data unit)
– Destination SAP, Sequence #, Error-Detection Code• Network layer appends another header
– Destination computer, facilities (e.g. “priority”)
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Protocols in a Simplified Architecture
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Operation of TCP/IP
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TCP & UDP
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IP Headers
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Operation of TCP/IP: Action at the Sender
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Operation of TCP/IP: Action at the Router
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Operation of TCP/IP: Action at the Receiver
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OSI• Open Systems
Interconnection
• Developed by ISO
• Contains seven layers
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The OSI Environment
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TCP/IP - OSI Comparison