Explain the functions of an operating system and basic project management terms.

Here are the explanations for question 6:

i)

a) What is an operating system?
An operating system (OS) is system software that manages computer hardware and software resources and provides common services for computer programs. It acts as an intermediary between the user and the computer hardware.

b) State and describe TWO functions of an Operating System.

1. Memory Management: The OS manages the computer's main memory (RAM), allocating memory to running programs and ensuring they do not interfere with each other. When a program finishes, the OS reclaims its memory.
2. Process Management: The OS handles the execution of multiple programs (processes) simultaneously, allocating CPU time to each process and managing their states (running, waiting, ready) to ensure efficient use of the processor.

c) Why are some operating systems said to be mono-tasking? Give an example.
Some operating systems are called mono-tasking because they can only execute one program or task at a time. The system must complete one task before starting another. An example is MS-DOS.

ii) Explain the following terms in project management:

a) Task
A task is a specific piece of work that needs to be completed within a project. It is a distinct activity with a defined start and end, often requiring resources and having a measurable outcome.

b) Slack task
A slack task (or non-critical task) is an activity in a project schedule that can be delayed without affecting the overall project completion date. The amount of time it can be delayed is called "slack" or "float."

c) Critical path
The critical path is the longest sequence of tasks in a project that must be completed on time for the project to finish by its due date. Any delay in a critical path task will delay the entire project.

d) PERT chart
A PERT (Program Evaluation and Review Technique) chart is a project management tool used to schedule, organize, and coordinate tasks within a project. It is a graphical representation of a project's timeline, showing dependencies between tasks and estimating completion times.

iii) Explain the functions of the following stating an appropriate example:

a) ISP
An ISP (Internet Service Provider) provides internet access to individuals and organizations. Its function is to connect users to the internet, allowing them to browse websites, send emails, and use online services.
Example: Safaricom Home Fibre provides internet connectivity to homes.

b) Protocol
A protocol is a set of rules that govern how data is formatted, transmitted, and received between devices in a network. Its function is to ensure reliable and orderly communication.
Example: HTTP (Hypertext Transfer Protocol) is used for transmitting web pages over the internet.

c) Handshaking
Handshaking is an automated process of negotiation between two devices or programs to establish the parameters of a communication channel before data transfer begins. Its function is to ensure that both ends are ready and agree on communication settings.
Example: When a computer connects to a Wi-Fi network, it performs handshaking with the router to agree on security protocols and data transfer rates.