Defense, Testing, IDE

Question 1

What is the purpose of defensive design

Answer 1

Ensures program functions properly

Question 2

How might programmers try to protect their programs through defensive design

Answer 2

Anticipate how users might misuse their program, then prevent it from happening
Ensure their code is well maintained
Reduce number of errors in the code through testing

Question 3

What is input validation

Answer 3

Checking if data meets certain criteria before passing it into the program

Question 4

What is input sanitation

Answer 4

Removing unwanted characters before passing data through the program

Question 5

Range check
Presence check
Check digit

Answer 5

Checks the data is within a specified range
Checks the data has actually been entered
Checks numerical data has been entered correctly

Question 6

Format check
Look-up check
Length check

Answer 6

Checks the data has the correct format
Checks the data against a table of acceptable values
Checks the data is the correct length

Question 7

What may happen if there is too much defensive design

Answer 7

Affects functionality and impacts user experience

Question 8

What is defensive design

Answer 8

Method of designing a computer program so that it functions correctly, doesn’t produce errors and doesn’t crash

Question 9

What is maintainability

Answer 9

Characteristic of defensive design which helps programmers to modify and repair computer programs more easily

Question 10

What is authentication

Answer 10

Method for checking the identity of a user before allowing them to access to data or program features through a use of e.g password

Question 11

Describe the ways to increase security

Answer 11

Force users to use strong passwords and get them to change their password regularly
Limit the number of failed authentication attempts before access to account is lost
Ask for a random selection of characters from the password on each authentication

Question 12

Describe the features that can improve maintainability of source code

Answer 12

Comments - explaining what key features of a program do
Indentation - can be used to separate different statements in a program - allows other programmers to see the flow of the program more clearly
Variables and sub programs - should be named so that they refer to what they actually are - helps programmers to keep track and recognise what the variables are

Question 13

Benefits of well maintained program

Answer 13

Makes it easy for programmers to understand what the program is designed to do
Allows them to change parts of the program without producing errors elsewhere

Question 14

What are syntax and logic errors

Answer 14

When the computer/interpreter doesn’t understand something you’ve typed because it doesn’t follow thr rules or grammar of thr programming language
When the complier or interpreter is able to run the program but the program does something unexpected

Question 15

Define structure diagrams

Answer 15

Uses decomposition to show the smaller tasks of a larger program which are further decomposed into individual tasks

Question 16

What is iterative testing

Answer 16

When a programmer performs checks to fix errors in a program while the program is still in development to prevent larger errors

Question 17

What is test plan

Answer 17

Created and used by a programmer to identify which parts of a program will be tested and how the test will be performed

Question 18

Advantages of structure diagrams

Answer 18

Coding is easier because you’re only writing to carry out very structure tasks
Lots of programmers can work on one program as each module can be written independently
Easier to test program

Question 19

What is final testing

Answer 19

Occurs once the program is finished and before it is released to the public or customer
Entire program is tested at same time

Question 20

What is normal data
What is boundary data
What is erroneous data

Answer 20

Data user is likely to input in a program
Values at the limit of what the program should be able to handle
Inputs that the program should not accept

Question 21

What is testing

Answer 21

Process of checking if a computer program functions in the intended way and meets certain requirements

Question 22

What is trace table

Answer 22

Method of tracking the value stored on a variable as the program is run while being tested

Question 23

What is invalid data

Answer 23

Data inputs which are the correct data type but should be rejected by the program