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NETWORKS

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on 25 September 2013

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Transcript of NETWORKS

Networks.
NETWORKS

A network is group of two or more computer systems linked together. There are many types of network, such as..
Peer to peer and client server networks
The types of computer network are..
Local-area network (LANs):
The computers are geographically close together (as in, in the same building.)
Wide-area network (WANs):
The computers are father apart and are connected by telephone wires or radio waves.
Campus-area network (CANs):
The computers are within a limited geographical area, such as a campus or military base.
Metropolitan-area network (MANs):
A data network designed to a for a town or city.
Home-area network (HANs):
A network contained within a users home that connects a persons digital devices.
In addition to these types, the following characteristics are also used to categorize different types of network..
The different types of network are:
Topology:
The geometric arrangement of a computer system. Common topologies include a bus, a star and a ring
Protocol:
The protocol defines a certain set of rules and signals the computers on the network use to communicate.One of the most popular protocols for LANs is called Ethernet. Another popular LAN protocol for PCs is the IBM token-ring network.
Architecture :
Networks can be broadly classified as using either a peer-to-peer or client/server architecture
Computers on a network are sometimes called nodes. Computers and devices that allocate resources for a network are called servers.
What is a network?
There are two ways of operating a network: peer to peer and client server. large organizations would use a client server network because it is more powerful and can do a lot more. peer to peer networking is fine for home networks or small businesses where a simple, inexpensive network is all that is needed.
Whether an organization chooses peer to peer or client server is mainly down to the size of the network.
Peer to peer.
The main features of a peer to peer network are:
-
Each computer on the network has equal status.

-All of the computers can share each others resources, eg, data, internet connection, printers, scanners.. etc.

-They are only suitable for small networks with fewer than 10 users.

-Only very basic knowledge is needed to set one up and use it.

-As more people use the network, the whole network slows down considerably.
Client server
The main features of client server networks are:
-One more powerful computer called the server is used to store data and the programs needed by the whole network. the server is in control of the network.

-Software and data is stored on the server, so it can be accessed by all of the computers on the network.

-The network is totally dependent on the server, if the server breaks down, the network cannot be used

-They are the popular choice for networks that need lots of computers.
By Eli and Laura.
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