Arsitektur Jaringan Pertemuan 09 Matakuliah: H0484/Jaringan Komputer Tahun: 2007.

Arsitektur JaringanPertemuan 09

Matakuliah : H0484/Jaringan KomputerTahun : 2007

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Learning Outcomes

Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu :

–Menjelaskan konsep jaringan model OSI–Menjelaskan model TCP/IP

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Outline Materi

• Layering model• Model OSI 7 layer• Model TCP/IP• Relasi

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OSI - The Model

• Open Systems Interconnection developed by the International Organization for Standardization (ISO).

• A theoretical system using a layering model• Each layer performs a subset of the required

communication functions• Each layer relies on the next lower layer to

perform more primitive functions• Each layer provides services to the next

higher layer• Changes in one layer should not require

changes in other layers

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OSI Model

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OSI Layers

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PhysicalPhysical interface between

devices Mechanical Electrical Functional Procedural

OSI Layer -1

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Data Link• Means of activating, maintaining

and deactivating a reliable link• Error detection and control• Higher layers may assume error free

transmission

OSI Layer - 2

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OSI Layer - 3

Network• Transport of information• Higher layers do not need to know

about underlying technology• Not needed on direct links

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OSI Layer - 4

Transport• Exchange of data between end

systems•Error free•In sequence•No losses•No duplicates•Quality of service

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Session• Control of dialogues

between applications• Dialogue discipline• Grouping• Recovery

OSI Layer - 5

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Presentation• Data formats and

coding• Data compression• Encryption

OSI Layer - 6

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Application– Means for applications to access

OSI environment

OSI Layer - 7

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Summary of Layer Functions

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TCP/IP Protocol Architecture

• Developed by the US Defense Advanced Research Project Agency (DARPA) for its packet switched network (ARPANET)

• Used by the global Internet• No official model but a working one.

– Application layer– Transport layer– Internetworking layer– Network access layer– Physical layer

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PDUs in TCP/IP

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Internet Layer (IP)

• Systems may be attached to different networks

• Routing functions across multiple networks• Implemented in end systems and routers

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Application Layer

• Support for user applications– HTTP, SMPT

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OSI v TCP/IP

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TCP/IP Concepts

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Addresses in TCP/IP