CSC339Computer

Communications&

Networks

Qaisar Javaid, Assistant Professor CIIT

Instructor: Qaisar Javaid

Assistant Professor & Head Networking Department

Instructor’s IntroductionInstructor’s Introduction

PhD Computer Science (In Progress)

MS Computer Science

MBA-Telecom Management

BS Computer Science

Microsoft Certified Trainer (MCT)

Cisco Certified Academy Instructor (CCAI)

Instructor’s IntroductionInstructor’s IntroductionCisco CertificationsCisco Certifications

Cisco Certified Internet Expert (CCIE)Cisco Systems USA

Cisco Certified Network Professional (Cisco Systems USA)

Cisco Certified Design Professional(Cisco Systems USA)

Cisco Certified Security Specialist (Cisco Systems USA)

Instructor’s IntroductionInstructor’s IntroductionMicrosoft CertificationsMicrosoft Certifications

Microsoft Certified System Engineer (MCSE)Microsoft Systems USA

Microsoft Certified Database Administrator (MCDBA) Microsoft Systems USA

Microsoft Certified System AdministratorMicrosoft Systems USA

Microsoft Certified Solution DeveloperMicrosoft Systems USA

Instructor’s ExperienceInstructor’s Experience

Operations Manager (Warid Telecom) 2003-2004

Manager Networks (BTC) 2004-2005

Project Manager (International Islamic University) 2005-2006

Assistant Professor & Head Cisco Networking (COMSATS University) 2006-2007

Head Cisco Networking & Assistant Professor (IIUI) 2007-to date

Course MaterialReference books

Many textbooks on CCN may be consulted

Data Communications & Networking, 4th edition by Behrouz A. Forouzan

Case Studies

RFCs and Internet drafts for Internet

Web resources

Tutorials, white papers, reports, etc.

Grading Policy

Assignments 10% Late assignments are not accepted

Quizzes 10%

Midterm exam 20%

Final exam 60%

Academic Honesty Your work in this class must be your own

If students are found to have collaborated excessively or to have cheated (e.g. by copying or sharing answers during an examination), all involved will at a minimum receive grades of 0 for the first infraction

Further infractions will result in failure in the course.

Prerequisites Prerequisites

Required: Introduction to Computing

Good knowledge of Computers

Recommended:

Basic Computer Programming Concepts

Expectations Expectations

What do you want (or expect) to learn from this course ?

Course ContentsCourse Contents Introduction

Network Models

Data & Signals

Digital Transmission

Transmission Media

Error Detection & Correction

Data Link Control

Course ContentsCourse Contents Wired LANs: Ethernet

Wireless LANs

Network Layer: Logical Addressing

Internet Protocols

Network Layer: Delivery, Forwarding , and Routing

Transport Layer

Course ContentsCourse Contents Switching & Vlans

Application Layer

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Chapter 1

Introduction

Computer Communication & Networks

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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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Figure 1.1 Five components of data communication

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Figure 1.2 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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Figure 1.3 Types of connections: point-to-point and multipoint

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Figure 1.4 Categories of topology

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Figure 1.5 A fully connected mesh topology (five devices)

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Figure 1.6 A star topology connecting four stations

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Figure 1.7 A bus topology connecting three stations

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Figure 1.8 A ring topology connecting six stations

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Figure 1.9 A hybrid topology: a star backbone with three bus networks

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Figure 1.10 An isolated LAN connecting 12 computers to a hub in a closet

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Figure 1.11 WANs: a switched WAN and a point-to-point WAN

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Figure 1.12 A heterogeneous network made of four WANs and two LANs

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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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Figure 1.13 Hierarchical organization of the Internet

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1-4 PROTOCOLS AND STANDARDS1-4 PROTOCOLS AND STANDARDS

In this section, we define two widely used terms: In this section, we define two widely used terms: protocolsprotocols and and standardsstandards. First, we define protocol, which is . First, we define protocol, which is synonymous with rule. Then we discuss standards, which synonymous with rule. Then we discuss standards, which are agreed-upon rules.are agreed-upon rules.

ProtocolsStandardsStandards OrganizationsInternet Standards

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