Technologies · Year 7

Active learning ideas

How Data Travels: Packets and Routers

Students understand how data moves across networks when they move through the process themselves. Acting out packet journeys and sorting router decisions turns abstract concepts into concrete experiences. This kinesthetic approach builds durable mental models of how networks actually work.

• ACARA Content Descriptions
• AC9TDI8K02

• 25–40 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Simulation Game
• 30 min · Small Groups

Relay Race: Packet Journey

Divide class into router stations and packet teams. Packet teams carry message cards with IP addresses through routers, who check addresses and direct them. Switch roles after one round, then discuss delays or lost packets. Debrief on real network paths.

Explain how data is broken into packets for transmission.

Facilitation Tip

During the Relay Race, set a visible timer so students see how small packets move faster than one large file would.

What to look for

Provide students with a simple network diagram showing 3-4 devices and 2 routers. Ask them to draw the path a data packet would take from Device A to Device C, labeling each router it passes through and explaining why it chose that path.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 02

• Simulation Game
• 25 min · Pairs

Card Sort: Router Decisions

Give students packet cards with IP addresses and network maps. In pairs, they sort cards into router output queues based on destination IPs. Compare paths and predict delivery times. Extend by adding 'faulty' routers.

Analyze the role of IP addresses and routers in network communication.

Facilitation Tip

For the Card Sort, have students trade cards with another group after sorting to verify that their router logic matches peers' before discussion.

What to look for

Ask students to write down the definition of a data packet and an IP address in their own words. Then, pose a scenario: 'If you send an email, what information does the IP address provide to help it reach the correct computer?'

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 03

• Simulation Game
• 40 min · Small Groups

String Network: Data Flow Model

Use string networks between desks as links, with students as routers passing paper packets. Include multiple paths and measure transmission time. Groups analyze efficiency and redraw optimal routes on paper.

Predict the path a data packet might take across a simple network.

Facilitation Tip

Build the String Network on a wall or board so students can trace paths with their fingers during and after construction.

What to look for

Facilitate a class discussion using the prompt: 'Imagine the internet is a highway system. What would a router be analogous to, and why is breaking data into packets like sending different parts of a large package via multiple trucks?'

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 04

• Simulation Game
• 35 min · Individual

Digital Simulator: Path Prediction

Use free online packet tracer tools. Students individually send packets across virtual networks, trace paths, and note router choices. Share screenshots in whole-class gallery walk.

Explain how data is broken into packets for transmission.

Facilitation Tip

In the simulator, pause the simulation after each step so students can record the router’s decision and the packet’s next hop.

What to look for

Provide students with a simple network diagram showing 3-4 devices and 2 routers. Ask them to draw the path a data packet would take from Device A to Device C, labeling each router it passes through and explaining why it chose that path.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

A few notes on teaching this unit

Teachers ground this topic in physical movement and hands-on models because networks are invisible systems. Avoid lectures about headers and IP addresses until students have felt the process. Research shows that students grasp dynamic routing better when they experience queuing delays and path selection firsthand. Use analogies sparingly; they can oversimplify the technical details.

By the end of the activities, students will explain why data splits into packets, how routers use headers to forward fragments, and why different paths can still deliver the whole message. They will use correct terminology in discussions and diagrams.

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Watch Out for These Misconceptions

• During the Relay Race, watch for students who try to pass the entire file at once rather than breaking it into smaller pieces.

  Reinforce the rule: one line of text or a single card per runner. After the race, ask students to calculate how many runners would be needed for a 100-line message and compare that to sending it all at once.

• During the Card Sort, watch for students who assume routers need to store the whole message before forwarding.

  Have students physically pass the cards one at a time while explaining their reasoning aloud. Emphasize that the router’s decision is based only on the card it holds, not the entire set.

• During the String Network, watch for students who believe IP addresses change as packets move through different routers.

  Ask students to write the source and destination IP on each card and tape it to the yarn at the starting and ending points. Trace the path together and confirm the IP stays the same while the route may differ.

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Methods used in this brief

• Simulation Game