Lesson Notes By Weeks and Term v4 - JHS 1

Lesson Video

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Performance objectives

• Identify key hardware for networks.
• Explain different network layouts, called topologies.
• Draw diagrams of network topologies.
• Discuss the advantages and disadvantages of each topology.

Lesson summary

In our daily lives in Ghana, we are constantly connected. We use our parents' phones to share data (hotspot), watch videos on YouTube, send messages on WhatsApp, and see Mobile Money agents transfer funds electronically. All of these activities are possible because of computer networks. A computer network is simply a group of computers and other devices connected together to share resources and information. This lesson will introduce us to the basic building blocks of these networks and the different ways they can be arranged, which we call "topologies." Understanding this helps us see how the digital world we use every day is built.

Lesson notes

Part 1: The Building Blocks of a Network (Hardware)

Before we can arrange our computers, we need some special equipment to connect them. Think of it like building a house; you need cement, blocks, and wood before you can decide on the design.

| Hardware Component | Description | Simple Analogy in Ghana | | :--- | :--- | :--- | | Server | A powerful computer that provides services or resources to other computers on the network. It "serves" data, files, or applications. | The librarian in the school library. They have all the main books (information), and you (the client) go to them to borrow one. | | Client | A regular computer (like a desktop or laptop) that requests services or resources from a server. | A student going to the library to ask the librarian for a specific book. | | Network Cable | The physical wire that connects devices on a network. The most common type is the Ethernet cable. | The road that connects your house to the market. Data travels along this road. | | Hub | A simple device that connects multiple computers. When it receives data, it broadcasts it to ALL connected computers, whether they need it or not. | A town crier shouting a message in the middle of the village. Everyone hears it, even if the message is only for one person. Hubs are not very efficient and are now considered old technology. | | Switch | A smarter device that connects multiple computers. When it receives data, it sends it ONLY to the specific computer that is supposed to receive it. | The postman or delivery person. They take a letter with a specific address and deliver it directly to that house, not to every house on the street. Switches are much more efficient than hubs. | | Router | A device that connects your small local network (like in your school or an internet cafe) to a larger network, like the Internet. | The main gate of your school. It connects all the students and teachers inside the school to the outside world (the main road and the town). Your home Wi-Fi device is usually a router. | Part 2: Network Layouts (Topologies)

A network topology is the arrangement or layout of the computers and devices in a network. It's like the architectural plan for the network. We will learn about three main types. a) Bus Topology

Evaluation guide

• Explore key hardware for setting up network systems (such as server, client, hub,
• switch, cable, etc.).
• Explain network topologies.
• Discuss the features of each network topology.