The new topic learnt this week is " Introduction to Networking".
Dr. Dayang has provided an intriguing example to explain the term "networking" in a highly comprehensible way :D
Firstly, let's take a ride of time machine to travel back to the Stone Age. Put your safety belt on and here we go !! :D
Now you're caveman A. You normally use drums to transmit message.
One day, you want to invite your friend, the caveman B for a game of hurling rocks at each other.
But caveman B is living too far away that he is unable to hear you banging the drum for invitation sake.
You have 3 options :
1. walk over to B's place
2. get a bigger drum
3. ask C who lives halfway in between to forward the message.
Performing NETWORKING, you'd choose the 3rd option.
Caveman C is equal to the data-sharing linkage between caveman A and B .o
In another context, NETWORKING is a collection of connected intelligent computing devices for the purpose of sharing data.
To be more precise, COMPUTER NETWORKING connects a computer with other computers or devices to bridge the communication.
The various types of network are categorized based on geographic coverage.
The most common ones are
LAN ---> Local Area Network
- confined to relatively small area
- eg: lab, schook. building
- rarely a mile apart ( between LANs computers )
- typical configuration : 1 computer acts as a server to store all the softwares that control the network and to be shared by all the computers attached to the network.
- Connect larger geographic areas
- eg : JB, Malaysia, the world.
- Schools in JB can communicate with places like KL
- cable and satellite uplinks
- uses multiplexing
- spans a city or a large campus
- interconnects a number of LANs using technologies like fibre-optical links
- provides up-links service to WAN and the internet.
- used for communication among computerized devices, including telephone and personal digital assistants
- intrapersonal communication
How are networks categorized? Using 3 properties:
- Topology ( geometric arrangement of the network )
- Protocol ( common set of rules & signals )
- Architecture ( peer to peer, client/server )
Network topology indicates how a network is designed ; there are 4 main types of network structures :
Bus Network Structure
- Only 1 computer can transfer information at a time.
- Information moves through the entire length of the cable.
- There is a terminator at the end of each cable
- Terminator absorbs signals transmitted, prevents the signals from bouncing back and causing interference.
- Advantage : simple
- Disadvantage: difficult expansion, computer malfunction affects the entire network, expensive
Star Network Structure
- Individual computer connected to a centre point of the network
- Most common type of network
- Central network connector : hub
- Cable length betwwen the hub and the computers < 100 meters.
- Advantage: easy, computer malfunction doesn't affect the network.
- Disadvantage : relies a lot on the hub to function, costly, large amounts of cable are used.
Ring Strucure Structure
- individual computers connected to a single length of cable arranged in a ring.
- The information travels in 1 direction only.
- Used to connect computers locate close to each other.
- No beginning or end in a ring network.
- Advantage: easy to install, low cost, easy to determine the location of faulty connection, help prevent network shutdown.
- Disadvantage: difficult expansion, expensive.
Hybrid Network Structure
- A mixture of many different kinds of network structures.
- Centralization network layout.
* Bounded Media ( twisted pair wire, co-axial cable, fibre optic cables)
* Unbounded Media ( AM/FM radio, TV broadcasting, Satellite communication, Microwave radio, Infrare signals)
Network Electronic Device
- private brance exhange (PBX)
- front end processor
This life is also all about networking, isn't it ? XD
Befriend, Socialize, Study, Love....
and those are the stepping stones which get us nearer and make it easier to reach our destination :)