Gollis Univeristy Faculty of Telecom Engineering Course Name: SQL Database Lecturer: Mukhtar Mohamed Ali “Hakaale” IT Admin and System Developer at Dahabshiil Co. Dahabshiil Head Quarter

Grading Scheme Assignment Points Homework: About the Course not Unique. Midterm: November 8th , yet not clear Final Exam: December10th also not clear Assignment Points Tests 20 Quiz’s and Assignments Project 30 Final Exam Total 100

Course Objectives Develop a fundamental understanding of the network design principles and performance metrics Become familiar with the mechanisms and protocols for reliable data communication via a computer network Be able to evaluate the performance of various network technologies and protocols Think as an engineer: What technologies should be employed to build a network with particular specifications? Develop interest in performing research in the area of Computer Networks

Topics to be covered Network architectures, performance metrics, layering Medium access control Internetworking, routing End-to-end protocols, flow control Congestion control and resource allocation Applications Network security

Introduction of the Course Have you ever wondered how networks work? How two computers communicate? How the Internet works? This course explains these concepts, starting with the basic building blocks of networks, and how Ethernet Local Area Networks (LANs) operate. We discuss IP addressing and subnetting, and how data gets routed from one LAN to another using various Wide Area Networking (WAN) technologies.

Connecting computers to form a Local Area Network ( LAN ) 1 What is Networking? Connecting computers to form a Local Area Network ( LAN )

Sharing of: Hardware Software Information 1 Device Sharing Sharing of: Hardware Software Information

1 A Simple Network

Local & Wide Area Networks 1 Local & Wide Area Networks Early networks were custom built Connecting a dozen computers Only 1 or 2 peripherals Early Ethernet 30 users total span of 601 feet

Local Area Network (LAN) 1 Local Area Network (LAN) A single collection of machines & peripherals Generally less than 1000 computers “Spanned” generally less than 250 meters feet Basic building block for larger networks- Internetworks

InterNetworks / IntraNetworks 1 InterNetworks / IntraNetworks A network of networks A networked collection of LANs More than one floor in a business (intranetwork) Multiple buildings Campus environment

Wide Area Networks (WAN) 1 Wide Area Networks (WAN) Spans miles of distance Two or more separate locations Down the road or across the world Microsoft, Federal Express

The Internet A WAN internetwork Millions of machines worldwide 1 The Internet A WAN internetwork Millions of machines worldwide The World Wide Web (WWW)

Instructor: M.M.C Hakaale The last but not least