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3.1.1 Basic Concept of Network (Part 1)

LEARNING OUTCOME : Students should be able to explain the basic concept of network.


I start my class by asking the students what is the first thing they do when they wake up every morning. Most of the students will answer, " Check my phone". 

Me : Why do you need to check your phone? 

Student 1 : To check messages in WhatsApp. 

Student 2 : To update my Facebook, Instagram or Twitter.

Student 3 : To play games like Candy Crush.

Student 4 : To make video call to my mom. 

All the things that you use on your smartphone every day clearly shows how important network is in our daily lives. Without network, you cannot do any of those things you just mentioned. 

Student 3 : What does network got to do with playing games?

Me : You need network to download the games. You need network to update the progress of your games on social media. You need network to invite other players to join you.

Basically, anything that you use or do that allows you to connect with other people needs network. 

OK, let's look at the definition of network.
A collection of computers & devices (nodes) connected together via communications devices & transmission media. 
From this definition, name 3 main components of a network.
  • computers & devices
  • communication device
  • transmission media

Examples of computers & devices in a network:

  • personal computer
  • laptop
  • smartphone
  • printer
  • server
  • tablet
  • scanner
Examples of communication devices :
  • hub
  • switch
  • router
  • network interface card (NIC)
  • modem
Examples of transmission media :
  1. physical
    • twisted pair cable
    • coaxial cable
    • fiber optic cable
  2. wireless
    • microwave
    • infrared
    • communication satellite 
    • cellular radio
    • broadcast radio
Exercise 3.1.1
  • Based on the pictures given, state the examples of every main component involved in each picture. 
Diagram 1 : Home Network
Diagram 2 : Office Network

  • Draw a network diagram based on the description given.
  1. Draw a home network that consists of 2 PCs, 5 mobile phones and 3 laptops with an Internet access.
  2. Draw a hotel network that connects 3 departments (housekeeping, front office and accounting) to the hotel server and the Internet. In each department, draw a few computers and printers connected together.   

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