Lesson Notes By Weeks and Term v5 - Grade 10

Lesson Video

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Performance objectives

• Define key networking terms.
• Distinguish between network types (LAN, WAN, MAN, PAN).
• Explain the function of network devices.
• Compare wired and wireless technologies.
• Identify basic network components.

Lesson summary

Welcome, Grade 10 IT learners! This week, we dive into the fascinating world of communication technologies and networks. Understanding how data travels from one place to another is crucial in today’s interconnected world. From using your phone to connect with family across the country to accessing online learning resources, communication networks are the backbone of modern communication. In South Africa, with our diverse communities and growing reliance on technology, understanding networks is especially important for bridging the digital divide and participating fully in the digital economy.

Lesson notes

2.1 What is a Network? At its simplest, a network is a collection of two or more devices connected together to share resources. These resources can include files, printers, internet access, or even applications. A node is any device connected to a network (e.g., a computer, a smartphone, a printer).

Example: Imagine a classroom. The teacher's computer, the learners' tablets, and the school printer are all connected. This forms a small network allowing learners to print their assignments and the teacher to share learning materials digitally. 2.2 Servers and Clients In many networks, we have servers and clients. A server is a powerful computer that provides services to other devices on the network. These services might include file storage, web hosting, or email. A client is a device that accesses these services provided by the server.

Example: Think about using a website like News

2

4. Their servers store all the news articles and videos. Your computer (or phone) is the client that requests information from their server. When you browse the website, your device is communicating with News24's servers. 2.3 Protocols Protocols are sets of rules that govern how devices communicate on a network. They ensure that data is sent and received correctly and in a standard format. Think of them as the languages that computers use to talk to each other. Without protocols, devices wouldn't be able to understand each other.

Examples: TCP/IP (Transmission Control Protocol/Internet Protocol): The fundamental protocol suite used on the internet.

HTTP (Hypertext Transfer Protocol): Used for transferring web pages.

SMTP (Simple Mail Transfer Protocol): Used for sending email. HTTPS (Hypertext Transfer Protocol Secure): An encrypted version of HTTP for secure web browsing. 2.4 Bandwidth and Latency Bandwidth refers to the amount of data that can be transmitted over a network connection in a given period, usually measured in bits per second (bps). Higher bandwidth means faster data transfer. Think of it as the width of a pipe – a wider pipe can carry more water at once. Latency is the delay between sending a request and receiving a response. High latency means a longer delay. Think of it as how long it takes for a signal to travel from one point to another.

Example: When streaming a video from YouTube in South Africa, bandwidth determines how quickly the video downloads, and latency affects how quickly the video starts playing after you press the play button. If you experience buffering, it could be due to low bandwidth or high latency. 2.5 Types of Networks Based on Geographical Scope LAN (Local Area Network): A network that covers a small geographical area, such as a home, office, or school. Typically connected using Ethernet cables or Wi-Fi.

Example: The network in your school's computer lab.

WAN (Wide Area Network): A network that covers a large geographical area, such as a city, country, or even the entire world. The internet is the largest WA

N. Example: Connecting to a website in Europe from South Africa uses a WA

N. MAN (Metropolitan Area Network): A network that covers a city or metropolitan area. Larger than a LAN but smaller than a WA

N. Example: A network connecting all the branches of a bank within Johannesburg.

PAN (Personal Area Network): A network that connects devices within a person's immediate vicinity, typically using Bluetooth.

Example: Connecting your wireless headphones to your smartphone. 2.6 Network Devices Routers: Connect different networks together and route data between them. They determine the best path for data to travel. Essential for connecting a home network to the internet.

Example: Your home router connects your devices to your ISP (Internet Service Provider).

Switches: Connect devices within the same network (LAN). They forward data only to the intended recipient, improving network efficiency.

Example: In a school computer lab, a switch connects all the computers together.

Modems: Convert digital signals from your computer into analog signals that can be transmitted over telephone lines or cable lines, and vice versa. They are essential for connecting to the internet via older technologies.

Example: An ADSL modem used to connect to the internet via a telephone line. 2.7 Wired vs.

Wireless Networks Wired Networks: Use cables (e.g., Ethernet cables) to connect devices. They are generally faster and more reliable than wireless networks, but less flexible in terms of device placement.

Advantages: Higher speed, greater stability, more secure.

Disadvantages: Less mobility, requires physical cabling.

Wireless Networks: Use radio waves (e.g., Wi-Fi) to connect devices. They offer greater flexibility and mobility, but can be slower and less reliable than wired networks.

Advantages: High mobility, easy setup.

Disadvantages: Lower speed, less stable, less secure (without proper configuration).