Lucy wrote: “I should validate the input into my database by typing in the same data twice”.Why was her statement incorrect?
Differentiate between bus topology and star topology of networks. What are the advantages and disadvantages of star topology over bus topology
Advantages of Star topology over Bus topology
Disadvantages of Star topology over Bus topology
The data before encryption is known as .................................................. text.
To scramble the data, an encryption .................................................., which is a type
of .................................................., is used.
The data after encryption is known as .................................................. text.
Encryption prevents the data from being .................................................. by a hacker
The data before encryption is known as .......plain.................. text.
To scramble the data, an encryption ......................key.........................., which is a type
of ...................key............................, is used.
The data after encryption is known as ....................cipher............................. text.
Encryption prevents the data from being ......................understood...................... by a hacker
State any four applications of electronic spreadsheets
Describe the difference between a barcode and A quick Response code (QR code)
(ii) State what ROM and RAM store.
ROM stores BIOS / bootstrap / start-up
RAM stores currently executing programs and data
Give one application of each type of data transmission. Each application must be different
Parallel
Serial
Describe a typical situation that requires the use of:
(i) a high-level language
(ii) a low-level language.
High level languages are used in situations when:
Low level languages are used in situations when:
Explain the difference between the sequential and parallel computational models.
Any four of:
Sequential:
• Individual instructions are executed one after another
• Flow control is accomplished by jump/branch/goto instructions
• Results are usually achieved less quickly than parallel processing (do
not award twice)
Parallel:
• Individual instructions can be routed to different processors for
simultaneous execution
• Results are usually achieved quicker than sequential instruction (do not
award twice)
• Requires multi-core processors or multiple microprocessors
• Tasks may be split into different parts with each part executed on a
different processor
• Results need to be merged back together after completion
There are security concerns associated with cloud storage.
(a) State one way in which providers of cloud storage could prevent security breaches by their own employees
(b) Explain why data on networks is encrypted
(a) One from:
(b) To prevent unauthorised access (1) so that data remains confidential (1) by making it unintelligible (1) because it is scrambled (1)
Joe plays online games using the world wide web. A sequence of processes is required to open a web page. Describe this sequence of processes
What precaution would you take in a computer lab if humidity falls below normal for prolonged periods due to weather changes?
Use a humidifier: Using a humidifier can help maintain a consistent level of humidity in the computer lab, which can prevent the negative effects of low humidity.
Avoid dry air: Avoid creating a dry environment in the computer lab by opening windows or using fans to increase air circulation.
Regular maintenance: Ensure that all computer components are properly maintained and cleaned to prevent damage due to static electricity.
Backup data: Regularly backup all important data to avoid data loss in case of hardware failure caused by low humidity.
Monitor humidity levels: Use a hygrometer to monitor the humidity levels in the computer lab and take corrective measures if the levels fall below a safe range.
Use anti-static materials: Use anti-static mats or wristbands when handling computer components to prevent static electricity buildup.
Explain why it is beneficial to get more RAM instead of relying on virtual memory.
State two benefits of using computerised traffic control systems.
Give one benefit and one disadvantage of the use of wireless technology.
Advantages
disadvantages e.g.
Explain the term website as used in the internet
State three advantages of biometric authentication
451/1
COMPUTER STUDIES
PAPER 1
THEORY
DECEMBER 2021
TIME: 2 HOURS
FORM TWO END OF TERM TWO 2O21 EXAM
451/1
COMPUTER STUDIES
PAPER 1
THEORY
TIME: 2½ HOURS
INSTRUCTIONS TO CANDIDATES:
State two advantages of electronic databases over a flat file
Describe what is meant by a MAC address.