Networks

·          Network is the interconnection of computers that are present in every organization.

·         Information can be transferred between computers through a network.

·         Coaxial cable --> used in TVs + not expensive + very slow when using + not used for connectivity.

·         Fiber optics --> used in big companies + expensive + very fast (data travel in form of light) + made of glass.

·         Computers which are close to each other and present in one class or in one department is known as LAN.

·         Analog signals --> not commonly used + continuous flow of signals + limited life + old.

·         Digital signals --> commonly used + convert signals to ones (max) and zeros (min) + new.

·         Networks protocols are rules of network which are used to avoid problems.

·         Network of computers within an organization is referred the intranet.

·         Intranet is used within an organization but internet is used for the whole world.

·         Example for e-learning is taking courses online.

·         People use search engines to find useful information (e.g: google).

·         Small sets of selected information are called as portals.

·         Websites are bigger than portals.

·          Mobile portals --> which can be used in mobile phones.

·         Benefits of e-learning:

1-      Read any time you wish.

2-      Information won't get old.

3-      Study online instead of going to the university and paying fees.