SS 2 First Term

Lesson objectives

By the end of the week, learners should be able to:

1. Define a network as devices sharing resources through a medium.
2. Name the four basic network topologies and compare them on combined criteria.
3. Explain why star topologies dominate modern networks.
4. Describe collision domains and how switches reduce them.
5. Trace network traffic from a client to a server across topology layers.

Key vocabulary

• Network: two or more devices sharing resources.
• Topology: the shape of the network connecting devices.
• Star topology: one central device connected to all others.
• Bus topology: one cable through which all devices attach.
• Ring topology: devices chained in a closed loop.
• Mesh topology: every device connected to every other device.
• Collision domain: the set of devices sharing one cable segment.
• Switch: a central device forwarding frames only to the destination port.
• Traffic trace: the path of a packet through a network.

Common misconceptions

• "Networks exist only in school labs." Networks exist at home, bank, hospital and transport.
• "Topologies must stay exact shapes." Real networks combine multiple topologies in practice.
• "A switch behaves like a hub." A switch forwards selectively; a hub broadcasts everywhere.

Teacher activities

1. Starter: ask where a packet leaves a desktop before reaching the internet.
2. Define a network and illustrate it as a shared-resource arrangement.
3. Name the four topologies and compare them on cost, reliability and scalability.
4. Explain collision domains and how switches reduce them.
5. Model tracing traffic from a client through the star topology to a server.
6. Close with the topology-choice task and exit question.

Student activities

1. Answer the starter and describe the path from desktop to internet.
2. Name the four topologies and state the defining feature of each.
3. Compare the four topologies on three combined criteria.
4. Describe collision domains in one sentence tied to hubs.
5. Trace traffic through a star topology from client to server.
6. Choose the topology suited to a school laboratory and justify it.

Practical / learning evidence

A four-topology comparison chart, a collision-domain explanation and a star-traffic trace worksheet. Submit all three for marking.

Resources and preparation

Printed comparison chart, blank topology trace template and sample traffic diagrams. Offline route: paper versions, no device needed. Display any router or switch carefully and never dismantle them during demonstration.

Assessment for learning

Inspect the comparison chart for at least two criteria filled correctly per topology. Mark the collision-domain explanation for a sensible hub behaviour. Check the star-traffic trace for correct client-to-server path. Flag any learner who claims a switch behaves like a hub.

Inclusion and homework

Provide the comparison prefilled for learners who need scaffolding and allow oral traffic trace. Extend confident learners with five topologies and a five-criteria ranking. Homework: name two real networks outside school and state the topology each uses.