Explain why a developer, who is good at both low-level and high-level programming, would normally use high-level languages when writing programs [4 marks]
Give one reason why a phased implementation would be the best approach to follow in this case.
Jane has noticed the following problems with her computer (2mks)
State three possible causes of these problems and how they can be solved (3mks)
There could be several possible causes for the issues Jane is experiencing with her computer keyboard, including:
1. Software Issues
- Cause: Outdated or corrupt system files, drivers, or operating system.
- Solution:
- Ensure the operating system and drivers are up-to-date.
- Run a system file checker to repair any corrupted system files (e.g., on Windows, run "sfc /scannow" from the Command Prompt).
- Consider reinstalling the operating system if issues persist.
2. Hardware Issues:
- Cause: Physical damage or malfunction in the keyboard hardware.
- Solution:
- Check for physical damage or debris under the keys and clean the keyboard if necessary.
- If cleaning doesn't help, consider replacing the keyboard with a new one.
3. Resource Overload:
- Cause: The computer may be running too many background processes or lacking sufficient hardware resources.
- Solution:
- Close unnecessary background applications and processes to free up system resources.
- Consider upgrading the computer's RAM, CPU, or storage if it's outdated and unable to handle current software demands.
- Use task manager or activity monitor to identify and terminate resource-intensive processes.
4. Malware or Viruses:
- Cause: Malicious software can slow down a computer, cause hanging, and delay startup.
- Solution:
- Perform a full system scan using reputable antivirus or anti-malware software to remove any threats.
- Ensure that the operating system's security patches are up-to-date.
5. Disk Fragmentation:
- Cause: Fragmented files can slow down the loading of applications and overall system performance.
- Solution:
- Run a disk defragmentation tool (e.g., Windows' built-in tool) to optimize file storage on the hard drive.
- Consider upgrading to a solid-state drive (SSD) for faster application loading times.
6. Insufficient Storage:
- Cause: If the hard drive is nearly full, it can cause slow performance.
- Solution:
- Free up space by deleting unnecessary files and programs.
- Consider upgrading to a larger capacity hard drive or SSD if storage space remains an issue.
7. Background Processes and Startup Items:
- Cause: Too many unnecessary programs running in the background or starting up with the computer.
- Solution:
- Disable or remove unnecessary startup items and background processes to improve startup time.
- Use the Task Manager or System Preferences (on macOS) to manage startup items.
It's important to diagnose the specific cause of the issues Jane is facing by troubleshooting each potential problem one by one. In some cases, a combination of these solutions may be necessary to fully resolve the problems with her computer keyboard.
1 (a) Computer networks are valuable to many businesses and individuals.
(i) State the purpose of network protocols
Any one of:
• To allow connected machines to communicate
• To provide the rules of communication between two networked devices
Convert the following:
(a) the binary number \(1111 1100_2\) to hexadecimal.
(b) the denary number \(138_{10}\) to hexadecimal.
(c) the hexadecimal number \(5D_{16}\) to denary.
(a) \(F C_{16}\)
(b) \(8 A_{16}\)
(c) \(93_{10}\)
Describe two differences between a switch and a repeater
Compare the use of a compiler with the use of an interpreter to translate code
Both translate source code written in high level programming languages into machine code.
Compiler: Produces a single executable file that is portable between machines
Interpreter: Source code needs a special environment to run
Compiler: Needs to be compiled for a particular architecture
Interpreter: Can run on any architecture that has the translator/interpreter
Complier: Entire source code file is translated at once
Interpreter: Code is translated line by line
Compiler: Provides error report at the end of the compilation
Interpreter: Errors more obvious in the sequence
Compiler: The program source code is not available (so helps protect IP)
Interpreter: Source code is available
Compiler: Only has to be translated once (affecting the speed of execution)
Interpreter: Has to be translated each time, therefore (affecting the speed of execution)
Compiler: Requires two files to be maintained (one for execution and for editing purposes)
Interpreter: Requires only one file to be maintained
Describe how the database can be recovered from a system failure
Give one benefit and one disadvantage of the use of wireless technology.
Advantages
disadvantages e.g.
State three utility programs associated with the use of a hard drive. Explain the purpose of each the program
Describe four features of the operating system when providing a graphical user interface on a personal computer. Give a suitable example of each feature.
Describe the principles of operation of laser printers and describe how they are applied in real-life scenarios
Steps
There are four change-over methods used in the implementation stage of the system development life cycle (SDLC): direct change-over, phased, parallel and pilot.
Direct Change-Over
Phased
What is meant by RAID technology?
RAID (Redundant Array of Independent Disks) technology refers to a method of combining multiple physical disk drives into a logical unit to improve performance, data availability, and data redundancy. RAID technology is commonly used in storage systems to provide fault tolerance, data protection, and increased storage performance.
The primary purpose of RAID is to create a more reliable and robust storage solution by spreading data across multiple drives and implementing various data redundancy techniques. This helps to mitigate the risk of data loss and system downtime in case of drive failures.
There are different levels or configurations of RAID, each offering different features and trade-offs. The most commonly used RAID levels are:
RAID 0 (Striping): Data is split evenly across multiple drives, resulting in increased performance as data can be accessed from multiple drives simultaneously. However, there is no redundancy, so if one drive fails, data loss can occur.
RAID 1 (Mirroring): Data is duplicated or mirrored across two drives, providing redundancy. If one drive fails, the other drive can still function and serve the data. RAID 1 offers data protection but does not offer increased performance.
RAID 5 (Striping with Parity): Data and parity information are striped across multiple drives, providing both increased performance and fault tolerance. Parity information allows for the recovery of data in case of a single drive failure. RAID 5 requires a minimum of three drives.
RAID 10 (Combination of Mirroring and Striping): RAID 10 combines elements of RAID 1 and RAID 0. It involves mirroring data across two sets of drives and then striping the mirrored sets for increased performance and fault tolerance. RAID 10 provides high levels of data redundancy and performance but requires a minimum of four drives.
State the reasons for system review and maintenance
Maranda MOCK 2024 CRE Paper 2
b) What Simeon and Anna said about the life of Jesus during the dedication. (7mks)
Jesus would save people
He would bring glory to Israel
He would be a light to the gentiles
He would be a universal savoir
He would bring judgment to the Israelites
Many people would oppose his work
He would reveal secret thoughts of people
He would be the source of redemption for Jerusalem
Explain the purpose of each of the following features of a spreadsheet chart (KCSE 2021 Computer Studies, Q19 (a))
Legend
A data series
Data Marker
Explain the purpose of each of the following features of a spreadsheet chart (KCSE 2021, Q19 (a))
Legend
A data series
Data Marker
https://www.lifewire.com/data-series-data-points-data-labels-3123411
Identify the network component that uses the IP address to send data only to its correct destination
Router
What is a defragmentation software
Define the following modes of electronic data processing:
Multi-tasking - It is a data processing modes where a single CPU processing more than one task or program apparently at the same time
Time-sharing - a processing mode where a single CPU processes tasks from more than one user apparently at the same time
Time-sharing - this is a processing mode in which the CPU serves two or more users with different processing requirements ( tasks)
On-line processing - is a mode of processing where the result of data processing transaction is available immediately
Real-time processing - is a mode of data processing in which the time interval required to process and respond to inputs is so small that the response itself is useful for controlling the physical activity of a process