Osi Model and Tcp/Ip

MIT 21053 -Computer Network AND System Administration

OSI MODEL AND TCP/IP

Mr. M. B. Mohamed Irshad, Senior Lecturer

Department of Management and Information

Technology

SEUSL

WHY NETWORK PROTOCOL MODELS ?

Network communication is an extremely complex task and Need cooperative

efforts from all nodes involved

A standard model helps to describe the task of a networking product or service

Who define Network Model?

I.

ISO - International Standards Organization

e.g. OSI, MPEG-1, 2, 4, etc. (http://www.iso.ch/)

II.

IEEE - Institute of Electrical & Electronic Engineers

e.g IEEE 802, IEEE 754, etc. (http://www.ieee.org)

III. ITU - International Telecommunication Union

e.g. V.34, H.323, H.324, etc. (http://www.itu.int)

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OSI MODEL AND TCP/IP

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IEEE 802 Categories

802.1

802.2

802.3

802.4

802.5

802.6

802.7

802.8

802.9

802.10

802.11

802.12

Internetworking

Logical Link Control (LLC)

Carrier-Sense Multiple Access with Collision

Detection (CSMA/CD) LAN (Ethernet)

Token Bus LAN

Token Ring LAN

Metropolitan Area Network (MAN)

Broadband Technical Advisory Group

Fiber-Optic Technical Advisory Group

Integrated Voice/Data Networks

Network Security

Wireless Networks

Demand Priority Access LAN, 100 BaseVG-AnyLAN

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OSI MODEL (OPEN SYSTEMS

INTERCONNECTION)

Developed by the International Organization for Standardization

(ISO), consists of seven layers, and protocols are developed to

perform the functions at each layer

It describes how information from a software application in one

computer, moves through a network medium to a software

application in another computer.

Allows different vendor’s hardware and software to

communicate and Provides a standard for all networking

operations and devices

OSI MODEL AND TCP/IP

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OSI 7 Layers

Description

OSI MODEL AND TCP/IP

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1. Physical Layer

Define how cable is attached to the

Network

Adapter

Card

and

responsible for...