chap7 - Computer Science Department (CSD) Centre for...

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FOSEE , MULTIMEDIA UNIVERSITY (436821-T) MELAKA CAMPUS, JALAN AYER KEROH LAMA, 75450 MELAKA, MALAYSIA. Tel 606 252 3594 Fax 606 231 8799 URL: http://fosee.mmu.edu.my/~csd/ Computer Science Department (CSD) Centre for Foundation Studies and Extension Education (FOSEE) PCA 0015 Computer Applications Foundation in Engineering ONLINE NOTES Chapter 7 Networking
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PCA0015 Computer Applications Chapter 7 Objectives: Upon completion of this topic, the students should be able to: Define what a network means. List the basic components of a data communication system. Explain the different types of data transmission methods, including types of signals, modulation and choices among transmission modes. Differentiate the various kinds of communication links, and appreciate the need for protocols. Explain the different types of network configurations or topologies. Know the components, types and protocols of a local area network. 7.1 What is Computer Communication? Computer Communications describe a process in which two or more computer or devices transfer data, instructions, and information. Nowadays, even the smallest computer is connected with others over a company network or with thousands or millions of computers around the globe via the Internet. To make it possible for communications to happen between two or more devices it needs the following items:- Sending and receiving devices-for initiating and accepting the data. (computer, handphones and etc.) Communication devices –to connect the sending and receiving devices to the communication channel. (Modem, Router, wireless Access point and etc.) Communication channel-transmission media on which the data, instructions or information travel. (cable, transmission tower, satellite and etc) Some Definitions: A n etwork is a collection of computers and devices connected by communication channels. CSD Lecturer 2/14
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PCA0015 Computer Applications Chapter 7 A standalone PC is a PC that is not connected to any network. Types of Networks: o Wide Area Network : network that covers a wide geographical area such as a country. A WAN consists of 2 or more LANs connected by routers. o Metropolitan Area Network : network covering a geographic area the size of a city or suburb. o Local Area Network : privately owned communications network that serves users within a confined geographical area. Most LANs are confined to a single building or group of buildings. However, one LAN can be connected to other LANs over any distance via telephone lines and radio waves. A system of LANs connected in this way is called a wide-area network (WAN). 7.2 How Information Travels In Computer communications, data or information travels in form of analog or digital signals via the communication channel. An analog signal is a continuous electrical signal in the form of a wave. It
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chap7 - Computer Science Department (CSD) Centre for...

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