Lesson Notes By Weeks and Term v4 - JHS 2
COMPUTER NETWORKS
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COMPUTER NETWORKS
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Subject: Computing
Class: JHS 2
Term: 2nd Term
Week: 9
Grade code: B8.3.1.1.1
Strand code: 3
Sub-strand code: 1
Content standard code: B8.3.1.1
Indicator code: B8.3.1.1.1
Theme: COMMUNICATION NETWORKS
Subtheme: COMPUTER NETWORKS
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In our daily lives in Ghana, we are constantly connected. We use WhatsApp to chat with family, watch funny videos on TikTok, use mobile money (MoMo) to send and receive cash, and browse websites for our homework. But have you ever wondered *how* a message from your Tecno phone in Kumasi can appear on your friend's Samsung phone in Accra almost instantly? It's not magic! It happens because all these different devices have agreed to follow a common set of rules, or a "model," for communication. Today, we will learn about the most famous set of these rules, called the OSI Model.
What is a Data Communication Model?
Imagine you and your friend want to build a house together. If you just start building without a plan, you will have a lot of problems. Maybe you build a wall where your friend wanted a door! A plan, or a blueprint, gives you a set of rules and steps to follow so you can work together successfully.
In the same way, a data communication model is a set of rules and standards that computer systems follow to communicate with each other over a network. It breaks down the very complex process of sending data into smaller, more manageable steps. The most famous model is the OSI Model. The OSI (Open Systems Interconnection) Model
The OSI Model is a conceptual framework developed by the International Organization for Standardization (ISO). It divides the process of network communication into seven distinct layers. Each layer has a specific job to do, and it provides services to the layer above it.