Overview

A 60-minute lesson for Year 9 students to explore Local Area Networks (LAN) and Wide Area Networks (WAN), alongside the devices used in each. This lesson follows the OCR GCSE Computer Science (J277) specification and aligns with the National Curriculum for England’s Computing programmes of study (Years 7–9). Students will build conceptual understanding and practical knowledge through the I DO, WE DO, YOU DO model.

National Curriculum Links and OCR Specification

OCR GCSE Computer Science J277
- Component 1: Computer systems
- Topic: Networks (J277/01)
- Understand types of networks including LAN and WAN
- Network devices: Router, Switch, Hub, Access Point, Modem
- Purpose and characteristics of network devices
- Advantages and disadvantages of different networks
National Curriculum (England) KS3 Computing Programme of Study
- Understand computer networks, including the internet
- Use search technologies effectively
- Understand hardware and software components, including networks
- Design, use and evaluate computational abstractions that model the state and behaviour of real-world problems

Learning Objectives

By the end of this lesson, students will be able to:

Define and explain the difference between Local Area Networks (LAN) and Wide Area Networks (WAN).
Identify and describe the main network devices used in LANs and WANs (router, switch, hub, access point, modem).
Explain the purpose and function of these devices within a network.
Evaluate the advantages and disadvantages of LAN and WAN networks.
Demonstrate practical understanding through diagram creation and mini-assessment tasks.

Resources Needed

Whiteboard and markers
Projector and laptop for slides
Network device images / actual devices (if available)
Printed worksheets for independent practice
Mini whiteboards and pens for quick formative assessment
Example LAN and WAN case studies (printed or projected)

Lesson Breakdown

Time	Phase	Activity Description	Details & Purpose
0-10 min	I DO (Introduction)	Teacher-led presentation and explanation of LAN and WAN concepts	Define LAN and WAN, introduce where each is used, show examples of devices and their roles. Use real-life analogies (e.g. LAN = school network, WAN = internet). Align terminology with OCR spec.
10-20 min	WE DO (Guided Practice)	Interactive whole-class activity: Identify network devices and match their functions	Teacher displays images of network devices; students discuss in pairs and share answers with the class. Clarify misconceptions. Scaffold using Q&A.
20-35 min	WE DO Continued	Collaborative diagram task: Create a simple LAN and WAN network diagram including devices	In groups of 4-5, students draw diagrams showing devices and connections on A3 paper or whiteboards. Teacher circulates facilitating discussion.
35-50 min	YOU DO (Independent Practice)	Worksheet with mixed question types: labeling devices, short answer on network types, pros & cons	Assess understanding through a scaffolded worksheet. Tasks include: 1) Identify devices in a diagram 2) Explain difference between LAN and WAN 3) List two advantages and disadvantages of LAN and WAN
50-60 min	Assessment & Plenary	Mini quiz (using mini whiteboards): Quick-fire quiz with conceptual & practical questions	Formative assessment to consolidate learning. Include questions such as: “Name a device used to connect LANs to WANs,” and “Give one advantage of a WAN.” Reflect on lesson objectives and recap key points.

Detailed Lesson Plan

0-10 mins: I DO – Introduction to LAN & WAN

Start with a quick starter question: “Where do you use networks around you?”
Define LAN: Small network within a limited area (e.g., home, school)
Define WAN: A large network spanning multiple geographical areas (e.g., the internet)
Introduce key devices: Router, Switch, Hub, Access Point, Modem
Use diagrams projected on the board to show simple LAN and WAN examples
Explicitly link vocabulary and concepts to the OCR specification and National Curriculum objectives

Teacher Modelling Tip: Verbalise thought process clearly when explaining device functions, e.g., “A router allows communication between networks—it’s like a traffic manager directing data.”

10-20 mins: WE DO – Exploring Network Devices Together

Show images of devices one by one
Ask students in pairs to discuss what they think the device does
Use targeted questioning to encourage reasoning and justification
Compile class answers on board and confirm accurate functions
Emphasise differences between switch, hub, and router to reduce misconceptions

20-35 mins: WE DO – Collaborative Diagram Task

Divide students into groups
Provide materials to draw either a LAN or WAN diagram including devices and connections
Encourage use of labels and arrows to demonstrate data flow
Teacher circulates, asks probing questions, supports learning as required
Groups share their diagrams and explain reasoning to the class briefly

Extension: Ask groups to predict what might happen if one device fails (introduces fault tolerance concepts).

35-50 mins: YOU DO – Independent Worksheet

Students complete a structured worksheet independently
Include five questions mixing:
- Device identification and role matching
- Short explanations of LAN vs WAN
- Listing advantages and disadvantages of each network type
Teacher monitors progress, offers subtle feedback to individuals needing support

50-60 mins: Assessment & Plenary

Conduct a quick-fire mini quiz using mini whiteboards
Example questions:
- “What device connects multiple LANs to form a WAN?”
- “Name one advantage of a LAN.”
- “What does a switch do?”
Collect screens or boards to judge understanding instantly
Summarise learning objectives and key takeaways
Highlight how this knowledge builds towards GCSE Computer Science understanding

Differentiation & Inclusion

Provide visual aids and simplified vocabulary sheets for EAL or SEN students
Challenge higher attainers with extension questions on network security implications or IP addressing briefly
Use peer support within group tasks to scaffold learning
Allow extra time and oral responses if needed for assessments

Assessment for Learning (AFL)

Use targeted questioning during WE DO phases to gauge understanding
Mini whiteboard answers during plenary provide immediate feedback
Worksheet results to inform intervention or extension in following lessons

Homework / Extension Suggestion

Research the difference between a modem and a router in home broadband setups
Write a paragraph explaining how the internet uses both LANs and WANs to connect people globally

This lesson plan offers a dynamic, scaffolded learning experience closely mapped to the National Curriculum and OCR GCSE specification, promoting both conceptual understanding and practical application of computer networks for Year 9 students.

Networks Explored

Teaching Instructions