Computing · Year 10

Active learning ideas

TCP/IP Protocol Suite

Active learning helps students grasp how TCP/IP actually works in real networks. Moving packets, role-playing connections, and analyzing real traffic make abstract concepts visible and memorable for Year 10 students.

• National Curriculum Attainment Targets
• GCSE: Computing - Network Protocols and Layers

• 25–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Role Play
• 35 min · Small Groups

Card Simulation: IP Packet Routing

Prepare cards as data packets with source/destination IP addresses and payloads. Students in small groups act as routers, passing cards along paths while noting fragmentation and reassembly. Discuss routing decisions and errors after 20 minutes.

Why is it essential for all devices on the internet to follow the same set of protocols?

Facilitation Tip

During the card simulation, arrange desks in a ring to represent network paths so students physically pass packets between routers.

What to look for

Present students with a simplified diagram of a data packet header. Ask them to identify which fields are likely part of the IP header (e.g., source/destination IP address) and which are part of the TCP header (e.g., sequence number, acknowledgment number). Discuss their reasoning.

• Apply
• Analyze
• Evaluate
• Social Awareness
• Self-Awareness

Activity 02

• Role Play
• 25 min · Pairs

Role-Play: TCP Three-Way Handshake

Pairs assign one as client and one as server; use scripted dialogue to enact SYN, SYN-ACK, ACK exchanges with props like flags. Switch roles, then debrief on connection reliability. Extend to simulate data transfer with packet loss.

Explain the role of TCP in ensuring reliable data transmission.

Facilitation Tip

In the role-play, assign students specific roles (e.g., Client, Server, Routers) and require handshake scripts to follow.

What to look for

Pose the question: 'Imagine you are sending a large file over the internet. Explain how TCP ensures the file arrives complete and in the correct order, even if some parts get lost or arrive out of sequence.' Facilitate a class discussion, encouraging students to use key vocabulary like 'segmentation', 'acknowledgment', and 'retransmission'.

• Apply
• Analyze
• Evaluate
• Social Awareness
• Self-Awareness

Activity 03

• Role Play
• 45 min · Small Groups

Wireshark Capture: Real Traffic Analysis

Install Wireshark; have students generate traffic by pinging sites or browsing. In small groups, filter captures for TCP/IP packets, annotate handshakes and payloads. Compare findings class-wide.

Analyze how IP addresses facilitate routing data packets across networks.

Facilitation Tip

For the Wireshark activity, pre-load captures with labeled packets to guide analysis and reduce overwhelm.

What to look for

Give each student a scenario, e.g., 'A web page is loading very slowly.' Ask them to write two sentences explaining one potential TCP issue (e.g., slow acknowledgments, packet loss) and one potential IP issue (e.g., inefficient routing, high latency) that could cause this problem.

• Apply
• Analyze
• Evaluate
• Social Awareness
• Self-Awareness

Activity 04

• Role Play
• 30 min · Pairs

Layered Model Build: Protocol Stack

Provide cardstock layers for physical, data link, IP, TCP. Individuals or pairs stack and label, adding example headers. Test by 'sending' messages through the model to peers.

Why is it essential for all devices on the internet to follow the same set of protocols?

Facilitation Tip

When building the layered model, use colored strips to represent each protocol layer so students see how headers stack.

What to look for

Present students with a simplified diagram of a data packet header. Ask them to identify which fields are likely part of the IP header (e.g., source/destination IP address) and which are part of the TCP header (e.g., sequence number, acknowledgment number). Discuss their reasoning.

• Apply
• Analyze
• Evaluate
• Social Awareness
• Self-Awareness

A few notes on teaching this unit

Teachers should avoid describing TCP/IP as a single entity. Instead, separate the roles early by naming each layer and protocol explicitly. Research shows hands-on packet handling builds stronger mental models than lectures alone. Use deliberate errors in simulations to highlight reliability gaps, reinforcing why TCP layers on IP.

Students will explain why IP alone cannot guarantee delivery, demonstrate the TCP handshake in role-play, and trace packets through a network simulation to reach the destination. Success looks like clear separation of IP routing from TCP reliability in their discussions and diagrams.

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Watch Out for These Misconceptions

• During Card Simulation: IP Packet Routing, watch for students assuming packets arrive intact and in order simply because they reached the destination.

  Use the simulation to introduce deliberate packet drops or reordering. After routing, have students verify delivery with acknowledgments, making visible IP’s best-effort nature and TCP’s recovery role.

• During Role-Play: TCP Three-Way Handshake, watch for students conflating the handshake with routing or data transfer.

  Structure the role-play to pause after SYN, SYN-ACK, and ACK exchanges. Ask students to label each step and discuss why the handshake establishes reliability before any data moves.

• During Wireshark Capture: Real Traffic Analysis, watch for students believing all online communication relies solely on TCP.

  In Wireshark, filter for ICMP or UDP traffic to show non-TCP protocols. Ask students to explain why these protocols don’t need handshakes or acknowledgments, reinforcing IP’s universal role.

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Methods used in this brief

• Role Play