Computing - PPQ Flashcards
How does a computer convert music into a file?
The height of the wave is sampled
And stored as binary
What effect will increasing the sample rate have on a recording?
Better quality - more accurate to the original sound
Larger file size - more samples have been taken / need to be stored
What are the advantages of storing data in an array?
Allows multiple items of data to be stored under one identifier
Can store the data in a table structure
Reduces the need for multiple variables
What features can be found in an IDE?
Error diagnostic
Run-time environment
Translator
Describe the use of SQL injection
- Malicious SQL code entered
- into a website/query form
- to modify the SQL statement that is to be executed
- Resulting in unauthorised access to data
How can you prevent SQL injection?
- Penetration testing: to find vulnerabilities
- Validation on user input: checking for disallowed QL statements
Describe a virus
Software that replicates itself
To delete data and slow the computer
How do you know if a network is a LAN rather than a WAN?
Over a small geographical area rather than a large one
Only uses internal hardware
What does the CU do?
Decodes instructions
Manages the F-D-E cycle
Sends command signals
Describe the purpose of virtual memory
Stores data on the hard disk when RAM is full
Stores data that isn’t currently in use
Allows her to run more programs simultaneously with less slow down
Why is systems software needed?
Provides an interface between software and hardware
What does memory management do?
- Allocates memory to applications
- so more than 1 piece of software can be run at once
- Removes data that is no longer needed
- to free up memory for other programs
- Moves data from main memory to virtual memory
What is meant by the frequency of a Wi-Fi signal?
The rate at which the signal oscillates/changes
What is Ethernet, and what does it do?
A protocol
- Governs the connection of devices on a network
- Governs the transmission of data between devices
- using cables
What are the benefits of a virtual network?
- Increased security
- as you need to log on
- Users can only see the data related to them
- so no access to what they shouldn’t have
