N5 ESQ Theory

Explain why it may be necessary to return to the implementation stage of an iterative development process after the testing stage?

Answer explanation

Going back to implmentation stage after testing stage might be necessary to correct any errors found during testing or to add additional code into solution.

State two implications of the General Data Protection Regulation for a business that stores the personal details of its staff.

Answer explanation

Data must be kept accurate about the staff in business.

Data must be held securely.

Staff Data can be usedonly for declared purposes.

Explain the purpose of a firewall

Answer explanation

Firewall is used to restrict access to the network. It protects the network computer from internet attacks by blocking data sent from particular IPs orserver ports.

Explain how encryption can keep data secure

Answer explanation

Data is scrambled up, coded and unreadable if captured during transfer.

Give an example of ASCII control character and ASCII printable character

Answer explanation

Control character any invisible character like start of the text, escape, delete

Prinatble character any character visible such as A-Z, a-z, 0-9 or punctuation.

List an attributes of vector object (any)

Answer explanation

Coordinates x and y

fill colour

line colour

Describe why the database might use restricted choice data validation:

Answer explanation

To eliminates user input errors.

User is presented with the only options available from.

Describe the methods of reducing the energy use of a computer system:

Answer explanation

Set computer to go into sleep mode after a period of inactivity.

Reduce monitor settings to make it less bright

Activate hard disk shut down settings

Describe an advantage of using an interpreter and advantage of using compiler to translate the program code into binary:

Answer explanation

Advantage of interpreter:

When using interpreter there is no need to leave the editing environment.

Interpreter will identify the position of errors identified during translation.

Advantage of compiler:

Requires less memory to execute program.

Translates code only once.

State the purpose of a foreign key in relational database?

Answer explanation

Foreign key is used to be able to link two tables together and create a relationship between them.