Describe the main characteristics that distinguish high-level programming languages from low-level languages.
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.
Describe the problem recognition and definition stage of system development
Outline a factor that can influence the performance of a network.
Maranda 2024 Mock CRE Paper 2
1. a) Based on Deutro-Isaiah, describe the Messiah. (7mks)
The Messiah would be despised/ rejected
The Messiah would be treated harshly/ arrested/sentenced to death
The Messiah would be reconciling people through His suffering
The death of the Messiah would bring forgiveness of sins of humankind
The Messiah would endure suffering/humiliation without complaining/ would suffer innocently
The Messiah would have nothing attractive
The Messiah would be humble/simple
The Messiah would be highly honored
The Messiah would succeed in His work
He would be despised, rejected, wounded oppressed and afflicted
He endured pain and suffering which would have been ours.
Because of our sins he was wounded
We are healed by the punishment he suffered He was treated harshly but he never said a word
He was put in the grave with the wicked
He was buried with the rich even though he did not commit a crime
He took the place of many sinners and prayed that they might be forgiven.
Explain why the organization's management and the analyst need to work together to define the problem accurately during system development
Explain the function of the protect sheet feature in the spreadsheet program
State advantages of hardcopy output
State three utility programs associated with the use of a hard drive. Explain the purpose of each the program
The Acme company stores data for a private scientific research group. It has recently upgraded its storage capacity and needs to dispose of its existing hard drives securely. Outline two methods for the secure disposal of the data on the hard drives.
Acme company needs to ensure that if they are reselling the drives they wipe the drive (this should be done regardless of the destruction of the drive) to the DoD standard.
This would ensure that any software cannot be used to locate files.
Define disk formatting and state three reasons for formatting a disk
Definition
Reasons:
Distinguish between application and system software
state two advantages of using a pseudocode during program design
Describe how ICT is used in marketing
Computer System Questions
Parallel data transmission
Serial data transmission
b) Give one benefit of each type of data transmission.
Serial
Give one application of each type of data transmission. Each application must be different
Parallel
Serial
State what is meant by the term USB
Describe two benefits of using USB connections between a computer and a device.
DVD - optical media which use one spiral track; red lasers are used to read and write data on the media surface; makes use of dual-layering technology to increase the storage capacity
ROM - non-volatile memory chip; contents of the chip cannot be altered; it is often used to store the start-up routines in a computer (e.g. the BIOS)
SSD/ Solid State Drive/memory (SSD): a non-volatile memory device that uses NAND flash memories (which consist of millions of transistors wired in series on single circuit boards)
Blue Ray - optical media that uses blue laser technology to read and write data on the media surface; it uses a single 1.1 mm polycarbonate disc
Viruses, pharming and phishing are all examples of potential Internet security issues.
Explain what is meant by each of these three terms.
Virus
Pharming - malicious code/software installed on a user’s hard drive/actual webserver
– this code redirects users to a fake website (without their knowledge)
– to obtain personal/financial information/data
Phishing - legitimate-looking emails sent to a user – as soon as the recipient opens/clicks on the link in the email/attachment, the user is directed to a fake website (without their knowledge) – To obtain personal/financial information/data
control bus- this bus carries signals used to coordinate the computer’s activities
address bus - this uni-directional bus carries signals relating to memory addresses between processor and memory
data bus - this bi-directional bus is used to exchange data between processor, memory and input/output devices
The seven stages in a von Neumann fetch-execute cycle
Modern LCD monitors and televisions use LED-backlit technology.
Give two advantages of using this new technology compared to the older cold cathode fluorescent lamp (CCFL) method
Give three characteristics of an IP address.
Explain why solid state storage is the best choice for a fitness tracker.
OR
OR
What is repetitive strain injury?
State the seven layers of the OSI model