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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

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Page 1: Three-Layer Model Distributed data communications involves three primary components: –Networks –Computers –Applications Three corresponding layers –Network

Three-Layer Model

• Distributed data communications involves three primary components:– Networks– Computers– Applications

• Three corresponding layers– Network access layer– Transport layer– Application layer

Page 2: Three-Layer Model Distributed data communications involves three primary components: –Networks –Computers –Applications Three corresponding layers –Network

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”)

Page 3: Three-Layer Model Distributed data communications involves three primary components: –Networks –Computers –Applications Three corresponding layers –Network

Protocols in a Simplified Architecture

Page 4: Three-Layer Model Distributed data communications involves three primary components: –Networks –Computers –Applications Three corresponding layers –Network

Operation of TCP/IP

Page 5: Three-Layer Model Distributed data communications involves three primary components: –Networks –Computers –Applications Three corresponding layers –Network

TCP & UDP

Page 6: Three-Layer Model Distributed data communications involves three primary components: –Networks –Computers –Applications Three corresponding layers –Network

IP Headers

Page 7: Three-Layer Model Distributed data communications involves three primary components: –Networks –Computers –Applications Three corresponding layers –Network

Operation of TCP/IP: Action at the Sender

Page 8: Three-Layer Model Distributed data communications involves three primary components: –Networks –Computers –Applications Three corresponding layers –Network

Operation of TCP/IP: Action at the Router

Page 9: Three-Layer Model Distributed data communications involves three primary components: –Networks –Computers –Applications Three corresponding layers –Network

Operation of TCP/IP: Action at the Receiver

Page 10: Three-Layer Model Distributed data communications involves three primary components: –Networks –Computers –Applications Three corresponding layers –Network

OSI

• Open Systems Interconnection

• Developed by ISO

• Contains seven layers

Page 11: Three-Layer Model Distributed data communications involves three primary components: –Networks –Computers –Applications Three corresponding layers –Network

The OSI Environment

Page 12: Three-Layer Model Distributed data communications involves three primary components: –Networks –Computers –Applications Three corresponding layers –Network

TCP/IP - OSI Comparison


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