Lesson Notes By Weeks and Term v5 - Grade 10

Lesson Video

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Performance objectives

• Define key terms like network, server, client, bandwidth, and protocol.
• Identify common network types: LAN, WAN, and MAN.
• Explain the function of network hardware like routers and switches.
• Describe the basic principles of network communication, including TCP/IP.
• Understand the concept of bandwidth and its impact on performance.

Lesson summary

In today's interconnected world, understanding communication technologies and networks is no longer optional – it's a necessity. From using your phone to WhatsApp your friends, to accessing educational resources online, to businesses connecting with customers across the country, networks are the backbone of modern communication and information access. This week, we'll delve into the fundamental concepts that underpin these technologies. Understanding these concepts will empower you to critically evaluate the technology you use every day, and prepare you for careers in a wide range of IT-related fields, which are increasingly in demand in South Africa.

Lesson notes

2.1 Basic Networking Terms: Network: A collection of two or more computing devices connected together for the purpose of sharing data and resources. Think of it like a highway system for information. In South Africa, networks connect businesses in Johannesburg to suppliers in Durban, allowing for efficient supply chain management.

Node: Any device on a network that can be identified and addressed. This can be a computer, a printer, a server, or even a smartphone. Every device connected to your home Wi-Fi is a node on that network.

Server: A powerful computer that provides services or resources to other computers (clients) on a network. Examples include web servers hosting websites, file servers storing documents, and email servers handling email communication. Imagine a school server storing all student records and assignments, accessible to teachers and students.

Client: A computer that requests and uses services provided by a server. Your computer at home is usually a client when you browse the internet, requesting web pages from web servers.

Bandwidth: The amount of data that can be transmitted over a network connection in a given amount of time, usually measured in bits per second (bps), kilobits per second (kbps), megabits per second (Mbps), or gigabits per second (Gbps). Think of it as the width of the highway – the wider the highway, the more cars can travel on it simultaneously. Low bandwidth can lead to slow internet speeds and buffering when streaming videos. Many rural areas in South Africa still struggle with limited bandwidth, impacting access to online education and business opportunities.

Protocol: A set of rules that govern how data is transmitted over a network. These rules ensure that different devices can communicate effectively, regardless of their manufacturer or operating system. Examples include TCP/IP (the foundation of the internet) and HTTP (used for accessing websites). Imagine protocols as the language spoken on the network so everyone can understand each other. 2.2 Types of Networks: LAN (Local Area Network): A network that connects devices in a limited geographical area, such as a home, office, or school. Typically uses Ethernet cables or Wi-Fi for connectivity. An example is the network in your school's computer lab.

WAN (Wide Area Network): A network that connects devices over a large geographical area, such as a city, country, or even the entire world. The Internet is the largest WAN. Companies with offices in multiple cities across South Africa use WANs to connect their locations.

MAN (Metropolitan Area Network): A network that connects devices within a city or metropolitan area. MANs are larger than LANs but smaller than WANs. An example is a network connecting multiple branches of a bank within a city. 2.3 Network Hardware Components: Router: A device that forwards data packets between different networks. Routers act as traffic directors, sending data to its intended destination. Your home router connects your home network to the internet.

Switch: A device that connects devices within a local area network (LAN). Switches intelligently forward data only to the intended recipient, improving network efficiency. Imagine a switch as the central hub in a school computer lab, directing network traffic between computers.

Network Interface Card (NIC): A hardware component that allows a device to connect to a network. Every computer and smartphone needs a NIC (either wired or wireless) to connect to a network. Your computer's Ethernet port and Wi-Fi adapter are examples of NICs.

Modem: Modulates and demodulates signals to enable data transmission over telephone lines or cable lines. Essential for connecting to the internet through older technologies like ADSL. 2.4 Network Communication and TCP/IP: Network Communication: Data is transmitted over a network in the form of packets. These packets contain the data being sent, as well as addressing information that indicates the source and destination of the data. TCP/IP (Transmission Control Protocol/Internet Protocol): A suite of protocols that forms the foundation of the internet. TCP handles the reliable transmission of data packets, while IP handles the addressing and routing of data packets. Think of TCP/IP as the set of rules that allows computers around the world to communicate with each other. When you access a website, your computer uses TCP/IP to communicate with the web server. 2.5 Bandwidth and Network Performance: Bandwidth directly affects network performance. Higher bandwidth means faster data transfer rates and a better user experience. Factors such as the number of users on a network and the type of applications being used can impact bandwidth requirements. Streaming high-definition video requires significantly more bandwidth than sending an email.

Example: A small office in Cape Town has 10 employees who regularly use email, browse the internet, and access online accounting software.