NETWORK???

This is my third post on my blog is about network. So far in semester 2, my topic that have learned in computer science is about network. I would like to share some information about networking.

In our daily life, network has been used for almost very time in this century. Why not we get to know more about it.

Network is a collection of computer and devices connected together via communication devices and transmitting data.

Network can be divide by two, First, network architecture and second, network topology.

Network architecture types

-Peer to peer
Peer to peer network is a network with all the nodes acting as both servers and clients. A PC can access files located on another PC and can also provide files to other PCs. 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 and capabilities to use the resources available on the network.

Client/Server
A client/server network is a network in which the shared files and applications are stored in the server but network users (clients) can still store files on their individual PCs. A server is a computer that shares information and resources with other computers on a network. A client is a computer which requests services or files from a server computer.

NETWORK TOPOLOGY

A network topology refers to the layout of the computer and devices in a communications network

Physical : the physical layout nodes, workstation and cable in the network

Logical : the path that data travel between computer in network

TYPES F NETWORK TOPOLOGY

Star Topology

Star- topology is a network topology where each individual piece of a network is attached to a central node (often called a hub or switch). The attachment of these network pieces to the central component is visually represented in a form similar to a star.

 

Advantages of Star Topology

• Fast performance with few nodes and low network traffic. 
• Hub can be upgraded easily. 
• Easy to troubleshoot. 
• Easy to setup and modify. 
• Only that node is affected which has failed, rest of the nodes can work smoothly.

Disadvantages of Star Topology

• Cost of installation is high. 
• Expensive to use. 
• If the hub fails then the whole network is stopped because all the nodes depend on the hub. 
• Performance is based on the hub that is it depends on its capacity 

Bus Topology

Bus topology is a specific kind of network topology in which all of the various devices in the network are connected to a single cable or line. In general, the term refers to how various devices are set up in a network.

Advantages of Bus Topology

• It is cost effective.
• Cable required is least compared to other network topology.
• Used in small networks.
• It is easy to understand.
• Easy to expand joining two cables together.

Disadvantages of Bus Topology

• Cables fails then whole network fails. 
• If network traffic is heavy or nodes are more the performance of the network decreases. 
• Cable has a limited length. 
• It is slower than the ring topology.

Ring Topology

It is called ring topology because it forms a ring as each computer is connected to another computer, with the last one connected to the first. Exactly two neighbours for each device.

Advantages of Ring Topology

• Transmitting network is not affected by high traffic or by adding more nodes, as only the nodes having tokens can transmit data. 
• Cheap to install and expand 

Disadvantages of Ring Topology

• Troubleshooting is difficult in ring topology. 
• Adding or deleting the computers disturbs the network activity. 
• Failure of one computer disturbs the whole network.