1. CSC339 Computer Communications & Networks Qaisar Javaid, Assistant Professor CIIT

2. Instructor: Qaisar Javaid Assistant Professor & Head Networking Department

3. Instructor’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)

4. Instructor’s Introduction Cisco 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)

5. Instructor’s Introduction Microsoft Certifications Microsoft Certified System Engineer (MCSE) Microsoft Systems USA Microsoft Certified Database Administrator (MCDBA) Microsoft Systems USA Microsoft Certified System Administrator Microsoft Systems USA Microsoft Certified Solution Developer Microsoft Systems USA

6. Instructor’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

7. Course Material Reference books Many textbooks on CCN may be consulted Data Communications & Networking, 4 th edition by Behrouz A. Forouzan Case Studies RFCs and Internet drafts for Internet Web resources Tutorials, white papers, reports, etc.

8. Grading Policy Assignments 10% Late assignments are not accepted Quizzes 10% Midterm exam 20% Final exam 60%

9. 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.

10. Prerequisites Required: Introduction to Computing Good knowledge of Computers Recommended: Basic Computer Programming Concepts

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

12. Course Contents Introduction Network Models Data & Signals Digital Transmission Transmission Media Error Detection & Correction Data Link Control

13. Course Contents Wired LANs: Ethernet Wireless LANs Network Layer: Logical Addressing Internet Protocols Network Layer: Delivery, Forwarding, and Routing Transport Layer

14. Course Contents Switching & Vlans Application Layer

15. 1.15 Chapter 1 Introduction Computer Communication & Networks

16. 1.16 1-1 DATA COMMUNICATIONS The term telecommunication means communication at a distance. The word data refers to information presented in whatever form is agreed upon by the parties creating and using the data. Data communications are the exchange of data between two devices via some form of transmission medium such as a wire cable. Components Data Representation Data Flow Topics discussed in this section:

17. 1.17 Figure 1.1 Five components of data communication

18. 1.18 Figure 1.2 Data flow (simplex, half-duplex, and full-duplex)

19. 1.19 1-2 NETWORKS A network is a set of devices (often referred to as nodes) connected by communication links. A node can be a computer, printer, or any other device capable of sending and/or receiving data generated by other nodes on the network. Distributed Processing Network Criteria Physical Structures Network Models Categories of Networks Interconnection of Networks: Internetwork Topics discussed in this section:

20. 1.20 Figure 1.3 Types of connections: point-to-point and multipoint

21. 1.21 Figure 1.4 Categories of topology

22. 1.22 Figure 1.5 A fully connected mesh topology (five devices)

23. 1.23 Figure 1.6 A star topology connecting four stations

24. 1.24 Figure 1.7 A bus topology connecting three stations

25. 1.25 Figure 1.8 A ring topology connecting six stations

26. 1.26 Figure 1.9 A hybrid topology: a star backbone with three bus networks

27. 1.27 Figure 1.10 An isolated LAN connecting 12 computers to a hub in a closet

28. 1.28 Figure 1.11 WANs: a switched WAN and a point-to-point WAN

29. 1.29 Figure 1.12 A heterogeneous network made of four WANs and two LANs

30. 1.30 1-3 THE INTERNET The Internet has revolutionized many aspects of our daily lives. It has affected the way we do business as well as the way we spend our leisure time. The Internet is a communication system that has brought a wealth of information to our fingertips and organized it for our use. A Brief History The Internet Today (ISPs) Topics discussed in this section:

31. 1.31 Figure 1.13 Hierarchical organization of the Internet

32. 1.32 1-4 PROTOCOLS AND STANDARDS In this section, we define two widely used terms: protocols and standards. First, we define protocol, which is synonymous with rule. Then we discuss standards, which are agreed-upon rules. Protocols Standards Standards Organizations Internet Standards Topics discussed in this section: