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- 1. Computer Communication & Networks LECTURE 1 INTRODUCTION asim.raheel@uettaxila.edu.pk
- 2. Instructors Course Instructor ◦ Dr. Aasim Raheel ◦ 2006 - 2010 BS Computer Engineering ◦ 2012 - 2015 MS Computer Engineering ◦ 2015 - 2020 PhD Computer Engineering Lab Instructor ◦ Engr. Shahid Ali asim.raheel@ uettaxila.edu.pk CCN
- 3. Grading Policy Mid 25% Final 50% Quizzes/Assignments 25% asim.raheel@ uettaxila.edu.pk CCN
- 4. asim.raheel@ uettaxila.edu.pk CCN Course Learning Outcomes (CLO’s) Sr. No. Course Learning Outcome (CLO’s) Bloom’s Learning Level 1. Understand basic communication model and addresses used at different layers for communication. C2 2. Apply signaling techniques and error detection and correction algorithms used in data communication and networks. C3 3. Compare different types of flow control and random-access mechanisms for efficient communication. C4 4. Analyze different routing algorithms for reliable communication. C4
- 5. asim.raheel@ uettaxila.edu.pk CCN Mapping of CLO’s to PLO’s Course CLOs PLO 1 PLO 2 PLO 3 PLO 4 PLO 5 PLO 6 PLO 7 PLO 8 PLO 9 PLO 10 PLO 11 PLO 12 Learning Levels CP-302 Computer Communication & networks CLO 1 50% C2 CLO 2 50% C3 CLO 3 50% C4 CLO 4 50% C4 PLO 1: Engineering Knowledge PLO 2: Problem Analysis
- 7. Networks in Daily Life asim.raheel@ uettaxila.edu.pk CCN Nowadays Networks are important part of our everyday activities: Business Home Government Education
- 8. Readings asim.raheel@ uettaxila.edu.pk CCN Data Communications and Networking, 4/e Behrouz A. Forouzan Reference Books: Computer Networking, a top-down approach featuring the Internet J. K. Kurose, K. W. Ross
- 9. Required Skills asim.raheel@ uettaxila.edu.pk CCN Course does not require any prior knowledge of networking…
- 10. Aim of the Course asim.raheel@ uettaxila.edu.pk CCN Aim of the course is to Introduce you to the world of computer networks Science behind running a network Basic administration skills
- 12. A Computer Network asim.raheel@ uettaxila.edu.pk CCN Before looking inside of a computer network, first of all define what a network is…
- 13. Network asim.raheel@ uettaxila.edu.pk CCN Potential of networking: Move bits everywhere, cheaply, and with desired performance characteristics Network provides “connectivity”
- 14. What is connectivity? asim.raheel@ uettaxila.edu.pk CCN Direct or indirect access to every other node in the network Connectivity is the magic needed to communicate if you do not have a direct pt-pt physical link
- 15. Why not connect each node with every other node ? asim.raheel@ uettaxila.edu.pk CCN Number of computers that can be connected becomes very limited Number of wires coming out of each node becomes unmanageable Amount of physical hardware/devices required becomes very expensive Solution: indirect connectivity using intermediate data forwarding nodes
- 16. Networks asim.raheel@ uettaxila.edu.pk CCN A network can be defined recursively as... two or more nodes connected by a link white nodes (switches) implement the network colored nodes (hosts) use the network
- 19. Data Communication asim.raheel@ uettaxila.edu.pk CCN Data Information to be presented Communication Sharing the information Computers can “manipulate” information Networks create “access” to information What does “Telecommunication” stands for…?
- 21. Components of Data Communication asim.raheel@ uettaxila.edu.pk CCN Message Sender Receiver Transmission Medium Protocol
- 23. Direction of Data Flow asim.raheel@ uettaxila.edu.pk CCN Simplex Half Duplex Full Duplex
- 24. Distributed processing asim.raheel@ uettaxila.edu.pk CCN Most computers use distributed processing
- 25. Networks: Key Issues asim.raheel@ uettaxila.edu.pk CCN Performance Throughput (bps) Delay (ms) Reliability Security
- 26. What Goes Wrong in the Network? asim.raheel@ uettaxila.edu.pk CCN Reliability at stake Bit-level errors (electrical interference) Packet-level errors (congestion) distinction between lost and late packet Link and node failures Distinction between broken and flaky link Distinction between failed and slow node
- 27. What Goes Undesirable in the Network? asim.raheel@ uettaxila.edu.pk CCN Required performance at stake Messages are delayed Messages are delivered out-of-order Third parties eavesdrop The challenge is to fill the gap between application expectations and hardware capabilities
- 29. Network Topologies asim.raheel@ uettaxila.edu.pk CCN Goal of any topology is: High “Throughput” Low “latency”
- 31. Hybrid Topology asim.raheel@ uettaxila.edu.pk CCN Star Backbone with three bus networks
- 32. Network Categories asim.raheel@ uettaxila.edu.pk CCN There are basically two categories of a computer network: LAN WAN
- 33. Hierarchical Organization of the Internet asim.raheel@ uettaxila.edu.pk CCN
- 34. Protocol asim.raheel@ uettaxila.edu.pk CCN Protocols define format, order of messages sent and received among network entities, and actions taken on message transmission, receipt. Hi Hi Got the time? 2:00 TCP connection req. TCP connection reply. <file> Get http://gaia.cs.umass.edu/index.htm time Human Protocol Computer Protocol
- 35. Key Elements of Protocol asim.raheel@ uettaxila.edu.pk CCN Syntax Semantics Timing
- 36. RFC asim.raheel@ uettaxila.edu.pk CCN Request For Comment Working internet protocol document when published https://www.rfc-editor.org/
- 37. Summary asim.raheel@ uettaxila.edu.pk CCN Data Communication is transfer of data from one device to another A DC system must transmit data to correct destination in an accurate and timely manner Five components of a DC system are: message, sender, receiver, medium and protocol Data flow: Simplex, Half Duplex, Full Duplex Network Topologies: Mesh, Star, Bus, Ring, Hybrid Network Categories: LAN, WAN Request For Comment (RFC)
- 38. Book Readings asim.raheel@ uettaxila.edu.pk CCN Chapter 1 (B.A Forouzan) Section 1.1, 1.2, 1.3, 1.4