McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

Data Comm. & Networks

Instructor: Ibrahim Tariq

My Introduction

Engr. Ibrahim Tariq 2010 -2012 MS (Computer Engineering) from LUMS

Area of Specialization: Wireless Networks 2006-2010 BS (Telecommunication Engineering) from NU-

FAST

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Web group

CS4592 at google grouphttp://groups.google.com/group/cs4592 This webgroup will serve as a communication medium between you and me besides the lecture timing.Do visit the course yahoo group regularly

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Reading Text book:

Data Communications and Networking, 4/e B.A. Forouzan,

McGraw-Hill, 2003, ISBN 0-07-292354-7.

Reference books: Computer Networking, a top-down approach

featuring the Internet (3rd edition), J.K.Kurose, K.W.Ross,

Addison-Wesley, 2005, ISBN 0-321-26976-4.

Computer Networks, A Systems Approach L. Peterson & Davie

Course Objective

The course is designed to introduce you to the world of computer networks, so that you could know the science being used in running this network Use this knowledge in your professional field The course covers concepts and useful tools for design and

performance analysis of data communication networks

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Grading Policy

Assignments/Quizzes : 24% Attendance : 12% Mid term : 24% Final Exam/project : 40%

Grading Policy is Tentative

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Lecture 1

Introduction

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1-1 DATA COMMUNICATIONS1-1 DATA COMMUNICATIONS

The term The term telecommunicationtelecommunication means communication at a means communication at a distance. The word distance. The word datadata refers to information presented refers to information presented in whatever form is agreed upon by the parties creating in whatever form is agreed upon by the parties creating and using the data. and using the data. Data communicationsData communications are the are the exchange of data between two devices via some form of exchange of data between two devices via some form of transmission medium such as a wire cable. transmission medium such as a wire cable.

ComponentsData RepresentationData Flow

Topics discussed in this section:Topics discussed in this section:

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Five components of data communication

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Data flow (simplex, half-duplex, and full-duplex)

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1-2 NETWORKS1-2 NETWORKS

A A networknetwork is a set of devices (often referred to as is a set of devices (often referred to as nodesnodes) ) connected by communication connected by communication linkslinks. A node can be a . A node can be a computer, printer, or any other device capable of sending computer, printer, or any other device capable of sending and/or receiving data generated by other nodes on the and/or receiving data generated by other nodes on the network.network.

Distributed ProcessingNetwork CriteriaPhysical StructuresNetwork ModelsCategories of NetworksInterconnection of Networks: Internetwork

Topics discussed in this section:Topics discussed in this section:

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Types of connections: point-to-point and multipoint

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Categories of topology

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A fully connected mesh topology (five devices)

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A star topology connecting four stations

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A bus topology connecting three stations

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A ring topology connecting six stations

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A hybrid topology: a star backbone with three bus networks

Categories of Network

Generally there are three categories of network

1. Local Area network (LAN)

2. Metropolitan Area Network (MAN)

3. Wide Area Network (WAN)

Category into which a network falls is determined by its size

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Categories of Network(2)

Local Area Network (LAN) A local area network (LAN) is usually privately owned

and links the devices in a single office, building, or campus

Wide Area Network (WAN) A wide area network (WAN) provides long-distance

transmission of data over large geographic area that may comprise a country, continent or world wide.

Metropolitan Area Network (MAN) A metropolitan area network MAN )is a network with a

size between a LAN and a WAN. Usually it is spreaded over a city or a part of a city

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An isolated LAN connecting 12 computers to a hub in a closet

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WANs: a switched WAN and a point-to-point WAN

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1-3 THE INTERNET1-3 THE INTERNET

The The InternetInternet has revolutionized many aspects of our daily has revolutionized many aspects of our daily lives. It has affected the way we do business as well as the lives. It has affected the way we do business as well as the way we spend our leisure time. The Internet is a way we spend our leisure time. The Internet is a communication system that has brought a wealth of communication system that has brought a wealth of information to our fingertips and organized it for our use. information to our fingertips and organized it for our use.

A Brief HistoryThe Internet Today (ISPs)

Topics discussed in this section:Topics discussed in this section:

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Hierarchical organization of the Internet

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