Computers that are used in large organizations such as insurance companies and banks, where many people frequently need to use same data, are ____.

Coded entries which are used to gain access to a computer system are called ____.

A person who used their expertise to gain access to other people's computers to get information illegally or do damage is a ____.

A network which is used for sharing data, software and hardware among several users owning microcomputers is called ____.

How many types of computers are there according to size?