Mind Map

NETWORK..!!

Hey min'na !

Today I want to share to all my reader about network. Network basic is the first topic the I learn in subject computer science in this semester.

Network is the collection of the computers & devices that connected together via communication devices and transmission media.

   

Basic Concept Of Network

Type Of Communication Device :

1. Router  

• A communication device that connect multiple computers or others routers together & transmit data to its correct destination on a network.

2. Dial-up Modem

• A communication device that can convert digital signals to analog signal & analog signals to digital signals.

3. Network Card

• A communication devices that enable a computer or device that does not have built-in networking capability to access a network.

4. Switch

• A connection device similar to hub but more sophisticated including functionality that allows it to control & manage data transmission.

5. Hub

• A connection device that allows multiple connection to the network.

6. Wireless Access Point (WAP)

• A central communication device that allows computers & devices to transfer data wireless among themselves or to transfer data wireless to a wire network using wireless technologies such as wi-fi.

Two Types Of Transmission Media

1. Guided Media (wired)

• Shielded Twisted Pair
• Untwisted Pair (UTP)
• Coaxial Cable
• Fiber Optic

2. Unguided Media (wireless)

• Cellular Radio
• Infrared
• Microwave
• Satelite

NETWORK ARCHITECTURE

(design of computers, devices & media in a network)

Client/Server

• A client/server network is a network in which the shared files & applications are in the server but network users (client) can still store files on their individual PC's. A server is a computer that shares information & resources with other computers on a network. A client is a computer which request services or files from a server computer.

Peer-To-Peer

• Peer-to-peer network is a network with all the nodes acting as both servers & clients. A PC can access another PC & can also provides files to other PC's. With peer-to-peer network no server is needed each computer in the network is called a peer. All computers in the peer-to-peer network has equal responsibilities to use the resources available on the network.

NETWORK TOPOLOGY

(a network topology refers to the layout of the computers & devices in a communications network)

3 types of network topology :

• Ring Topology

A network topology that is set up in a circular fashion in which data travels around the ring in one direction & each device on the ring acts as a repeater to keep the signal strong as it travels. Each device incorporates a receiver for the incoming signal & a transmitter to send the data on to the next device in the ring. The network is dependent on the ability of the signal to travel around the ring. When a device sends data, it must travel through each device on the ring until it reaches its destination. Every node is a critical link. In a ring topology, there is no server computer present. All nodes work as a server & repeat the signal. The disadvantage of this topology is that if one node stops working, the entire network is affected or stops working.

• Star Topology

In local area networks with a star topology, each network host is connected to a central hub with a point-to-point connection. In Star topology every node (computer workstation or any other peripheral) is connected to a central node called hub or switch. The switch is the server & the peripherals are the clients. The network does not necessarily have to resemble a star to be classified as a star network, but all of the nodes on the network must be connected to one central device. All traffic that traverses the network passes through the central hub. The hub acts as a signal repeater. The star topology is considered the easiest topology to design and implement. An advantage of the star topology is the simplicity of adding additional nodes. The primary disadvantage of the star topology is that the hub represents a single point of failure.

• Bus Topology

In local area networks where bus topology is used, each node is connected to a single cable. Each computer or server is connected to the single bus cable. A signal from the source travels in both directions to all machines connected on the bus cable until it finds the intended recipient. If the machine address does not match the intended address for the data, the machine ignores the data. Alternatively, if the data matches the machine address, the data is accepted. Because the bus topology consists of only one wire, it is rather inexpensive to implement when compared to other typologies. However, the low cost of implementing the technology is offset by the high cost of managing the network. Additionally, because only one cable is utilized, it can be the single point of failure.

"MY AIM , MY DESTINY"

Assalamualaikum and ohayou min'na,

Welcome again to my blog ...

I'm now further studying at Collage Matriculation Pahang in Gambang. I was offered Two Years Program in Science. I was bit stumped because all pf my friends who also went to matriculation got One Year Program. I as matriculation's student have my own goals to be successful on future. Well, I think all people have their goals in to make it become reality.

What means aim..?? Aim means a purpose or intention, a desired outcome and also known as objective. So, what's your objective to become a successful person especially for us as a student..??

Today I want to share to all of you about my aim. My aim when I step in Collage Matriculation Pahang is to achieve my goal in my examination to earn pointer 4.0 in every semester. All student of matriculation want to get 4.0, right..?? Same with me. But, the question is "did we have enough study to get that pointer..??". I'm want to make my whole family and all my friends proud with me. Since my PSPM 1 result was quite disappointing, so I determined to change myself. Gratefully, even though my PSPM 1 result was not very flying with colors but I thankful because I still stay here. For all my teacher that teach me, I want to say "i'm sorry" because make you all disappointing with my result. From now, In Syaa Allah I will try my best to change  my attitude and make my family, my friends, my teachers and people that always support me until now proud with me especially my parents.

Now, I want talk about destiny. Destiny means fate is synonymous with masculine like a divine command and fate. There is no one can avoid from destiny. It will happen no matter what you do but before you get bogged down worrying about what the distant future holds, remember what Winston Churchill said "It is a mistake to look too far ahead. Only one link in the chain of destiny can be handled at a time". Actually we can change our destiny but the question is "How we can change it..??".

As a Muslim, our prayer is our weapon. Pray to Allah for everything that you want. Even if you're a big sinner, you need always rely on Allah because only HIM that can do everything and can change everything include our destiny.

"courage is the most important of all the virtues because without courage, you can't practice any other virtue consistently"