Information Technology AL

Discuss the advantages and disadvantages of the use of mainframe computers

Computerized weather stations are used to monitor a number of analogue atmospheric variables.

Describe how three of these variables are collected and what needs to happen to the data before it can be used by a computer

Some expert systems use a mixture of forward chaining and backward chaining. Some use forward chaining only.Describe the process of forward chaining

State 3 different methods which can be used to prevent phishing.

Describe what is meant by the term ‘spyware’

Tick the most accurate statement referring to hardware

• There are two types of hardware: application hardware and system hardware.

• Hardware consists of the programs used to direct the operation of a computer.

• Hardware is the collection of physical components that constitute a computer system.

• A device driver is an example of an item of hardware

Tick the most accurate statement referring to RAM

• A hard disk drive allows quicker access to data than RAM

• RAM is portable and very easy to move from device to device

• RAM stores active program data

• Per unit of memory, RAM is far cheaper to buy than a hard disk drive

Tick the most accurate statement referring to a gesture-based interface

• It is easier for users with physical disabilities to use a keyboard or mouse than make gestures

• It is easier to enter text with a gesture-based interface than with a command line interface

• Gestures are more accurately interpreted than mouse clicks

• Some gestures may be unintentional but still initiate a reaction from the device

Evaluate, by weighing up the advantages and disadvantages, a CLI compared to a graphical user interface (GUI)

There is a global digital divide between more and less industrially developed nations.Describe this type of digital divide.