osi model data communications. 7 layer “research” model...

OSI Model Data Communications

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OSI Model

Data Communications

7 layer “research” model

Application

Presentation

Session

Transport

Network

Link

Physical

5 layer “real-life” model

Application (presentation session)

Transport

Network

Link

Physical

Introduction

Internet protocol stack• application: supporting network

applications– FTP, SMTP, HTTP

• transport: process-process data transfer– TCP, UDP

• network: routing of datagrams from source to destination– IP, routing protocols

• link: data transfer between neighboring network elements– Ethernet, 802.111 (WiFi), PPP

• physical: bits “on the wire”

application

transport

network

link

physical

1-4

Introduction

ISO/OSI reference model

• presentation: allow applications to interpret meaning of data, e.g., encryption, compression, machine-specific conventions

• session: synchronization, checkpointing, recovery of data exchange

• Internet stack “missing” these layers!– these services, if needed, must be

implemented in application– needed?

application

presentation

session

transport

network

link

physical

1-5

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