KEY FLASHCARDS

Question 1

calculate the size of a text file.

Answer 1

bytes per character x no. of characters

Question 2

calculate the size of an image file.

Answer 2

resolution x colour depth

Question 3

calculate the size of a sound file.

Answer 3

sample rate x duration in secs. x bit depth

Question 4

how is sound sampled/stored?

Answer 4

1. measurements of the original sound are captured and stored as binary on secondary storage
2. sound waves begin as analogue and are converted to digital
3. called analogue to digital conversion
4. begins by measuring the height of the sound wave - are called samples
5. using samples, the computer is able to create a digital version of the original analogue wave

Question 5

what is sample rate?

Answer 5

• sample rate is the amount of samples taken per second of the analogue wave

Question 6

what is bit depth?

Answer 6

• the number of bits stored per sample of sound

Question 7

web servers

Answer 7

• dedicated servers which store web pages/ websites and other resources
• have dedicated IP adress -> users can access them 24/7
• most common - hosting websites and dealing with client requests

Question 8

forms of attack

Answer 8

• malware
• social engineering
• brute-force
• denial of service
• data interception and theft
• SQL injection