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D ata C ommunication and C omputer N etworks

D ata C ommunication and C omputer N etworks. First Semester Sana Ahmed. Data Communication. Data Communications are the exchange of data between two devices via some form of transmission. Data Communication Characteristics. 1. Delivery :

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D ata C ommunication and C omputer N etworks

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  1. Data Communication and Computer Networks First Semester Sana Ahmed

  2. Data Communication • Data Communications are the exchange of data between two devices via some form of transmission. Data Communication & Computer Network

  3. Data Communication Characteristics 1. Delivery: The system must deliver data to the correct destination. 2. Accuracy: The system must deliver data accurately. 3. Timelines: The system must deliver data in timely manner. 4. Jitter: refers to the variation in the packet arrival time Data Communication & Computer Network

  4. Components of Data Communication Protocol Protocol Rules . . . Rules . . . Message Receiver Sender Data Communication & Computer Network

  5. Components of Data Communication cont. 1. Message: information 2. Sender: The device that send the msg. 3. Receiver: The device that receive the msg. 4. Transmission Medium: The physical path between sender and receiver ,the message travel 5. Protocol: A set of rules that govern data communication. Data Communication & Computer Network

  6. Data Flow in Communication • Simplex: one direction only • Half-duplex: two-way alternate In different time

  7. Data Flow in Communication cont. • Duplex: two-way concurrent . At same time Data Communication & Computer Network

  8. Network • A Networkis a set of node connected together by communication link to share resources and to transmit information. • Node : Computer, Printer, Scanner, Software, etc. • Information: text, voice, picture, etc Data Communication & Computer Network

  9. Why Network ????? Sharing Sharing of What ????? Resources What Resources ????? Printer, Scanner, Memory, Information Network Bandwidth, Internet Services, Data Base, etc. Data Communication & Computer Network

  10. Network Services • Sharing (file, printer, application). • Internet browsing. • Fax Service. • Telephony. • Conferencing. • Database. • Backup. Data Communication & Computer Network

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