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Computer Communication and Networks

Lecture # 03

CS-3323

Muhammad Waseem IqbalData Communication, University of Lahore, Pakistan

DATA COMMUNICATIONSDATA COMMUNICATIONS

The term telecommunication means communication at a The term telecommunication means communication at a distance. The word data refers to information presented in distance. The word data refers to information presented in whatever form is agreed upon by the parties creating and whatever form is agreed upon by the parties creating and using the data. Data communications are the exchange of using the data. Data communications are the exchange of data between two devices via some form of transmission data between two devices via some form of transmission medium such as a wire cable. medium such as a wire cable.

ComponentsData RepresentationData Flow

Topics discussed in this section:Topics discussed in this section:

Data Communication, University of Lahore, Pakistan

Figure Five components of data communication

Data Communication, University of Lahore, Pakistan

Figure Data flow (simplex, half-duplex, and full-duplex)

Data Communication, University of Lahore, Pakistan

NETWORKSNETWORKS

A network is a set of devices (often referred to as nodes) A network is a set of devices (often referred to as nodes) connected by communication links. A node can be a connected by communication links. A node can be a computer, printer, or any other device capable of sending computer, printer, or any other device capable of sending and/or receiving data generated by other nodes on the and/or receiving data generated by other nodes on the network.network.

Distributed ProcessingNetwork CriteriaPhysical StructuresNetwork ModelsCategories of NetworksInterconnection of Networks: Internetwork

Topics discussed in this section:Topics discussed in this section:

Data Communication, University of Lahore, Pakistan

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

Data Communication, University of Lahore, Pakistan

Figure Categories of topology

Data Communication, University of Lahore, Pakistan

Figure A fully connected mesh topology (five devices)

Data Communication, University of Lahore, Pakistan

Figure A star topology connecting four stations

Data Communication, University of Lahore, Pakistan

Figure A bus topology connecting three stations

Data Communication, University of Lahore, Pakistan

Figure A ring topology connecting six stations

Data Communication, University of Lahore, Pakistan

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

Data Communication, University of Lahore, Pakistan

Figure An isolated LAN connecting 12 computers to a hub in a closet

Data Communication, University of Lahore, Pakistan

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

Data Communication, University of Lahore, Pakistan