introdution of ccn

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  • Computer Communication & NetworksLecture # 01Introduction

  • Grading PolicyFinal Exam: 40%Mid term Exam20%Assignments10%Quizzes:10%Labs + Project20%

  • ReadingText book: Data Communications and Networking, 4/eB.A. Forouzan, McGraw-Hill, 2003, ISBN 0-07-292354-7. Data and Computer Communication by William Stallings (7th Edition) Prentice Hall.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.

  • Data CommunicationsThe 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.

  • Fundamental CharacteristicsThe effectiveness of a data communication system depend on four fundamental characteristics:DeliveryAccuracyTimelinesJitter

  • Five Components of Data CommunicationMessageSenderReceiverMediumProtocol

  • Data Representation

    Information comes in different form such as, Text NumbersImagesAudioVideo

  • Figure 1.2 Data flow (simplex, half-duplex, and full-duplex)SimplexHalf DuplexFull Duplex

  • 1-2 NETWORKSA 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.

  • Networks: key issuesNetwork criteriaPerformanceTransit timeThroughputDelayReliabilityData transmitted are identical to data received.Measured by the frequency of failureThe time it takes a link to recover from a failure SecurityProtecting data from unauthorized access

  • Terminology

    The throughput or bandwidth of a channel is the number of bits it can transfer per second

    The latency or delay of a channel is the time that elapses between sending information and the earliest possible reception of it

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

  • Network topologiesTopology defines the way hosts are connected to the network

  • Network topology issueshigh throughput (bandwidth)

    low latencyA goal of any topology

  • Categories of Topology

  • Figure 1.5 A fully connected mesh topology (five devices)

  • Advantages & disadvantages of mesh topologyAdvantages - Dedicated links eliminate the traffic problem -Secure communication -Ease of fault identification & fault Isolation -RobustDisadvantages-Large number I/O ports & cabling required-Installation & reconfiguration is difficult-Wiring can be greater than available space-Expensive

  • Figure 1.6 A star topology connecting four stations

  • Advantages & disadvantages of star topologyAdvantages -Less expensive than mesh topology -Installation & reconfiguration are easy -Robust - Ease of fault identification & fault Isolation-Required less cabling than mesh topologyDisadvantages-Dependency of whole topology on single pointApplication: High Speed LAN

  • Figure 1.7 A bus topology connecting three stations

  • Advantages & disadvantages of bus topologyAdvantages -Ease of installation -Required less cablingDisadvantages -Difficult reconnection &fault isolation -A fault or break stops all transmission

  • Figure 1.8 A ring topology connecting six stations

  • Advantages & disadvantages of bus topologyAdvantages-Ease of installation & reconfiguration

    Disadvantages-A break in ring can disable the entire link

  • A hybrid topology: a star backbone with three bus networks

  • Categories of networks: LAN, MAN, WAN

    Network in small geographical Area (Room, Building or a Campus) is called LAN (Local Area Network)Most common LAN topologies are bus, ring &starNetwork in a City is call MAN (Metropolitan Area Network)

    Network spread geographically (Country or across Globe) is called WAN (Wide Area Network)

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

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


    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

  • 1.*Figure 1.13 Hierarchical organization of the Internet

  • ProtocolA protocol is a set of rules that governs data communication key elements of protocol areSyntaxSemanticsTiming

  • StandardsStandards are agreed upon rules, which Provide guideline to manufacturer, venders, governments agencies & other service providers to ensure the interconnectivity.Data communication fall into two categories -De facto -De Jure

  • ApplicationsE-mailSearchable Data (Web Sites)News GroupsInternet Telephony (VoIP)Video ConferencingChat GroupsInternet Radio