Network Hardware
How to Think About Network Hardware
Network hardware is easier to remember when you ask what problem the device solves: connecting one device, connecting many local devices, connecting different networks, or protecting traffic.
School scenario
A student opens OneDrive on an iPad. The request travels from the iPad to a wireless access point, through a switch, through the firewall and router, then out through the modem/ISP connection to Microsoft. Each device has a different role; they are not interchangeable names for the same thing.
Essential Devices
| Device | Main role | Exam clue | Common mistake |
|---|---|---|---|
| NIC | Allows an individual device to connect to a network. Can be wired or wireless. | The question asks how a laptop or desktop physically joins a network. | Do not call the whole network connection a NIC; it is the device interface. |
| Switch | Connects devices within one LAN and forwards frames to the correct local device. | Many classroom computers or printers need to connect in the same building. | A switch does not normally connect the LAN to the internet by itself. |
| Router | Connects different networks and directs packets between them using network addresses. | The question mentions internet access or traffic moving between networks. | Do not define it as just "Wi-Fi". Some routers include Wi-Fi, but routing is the core role. |
| Wireless access point | Allows wireless devices to join a wired network using Wi-Fi. | The scenario includes tablets, phones or laptops connecting without Ethernet cables. | A WAP is not the same as the internet; it provides wireless access to the LAN. |
| Modem | Converts signals so the local network can communicate over an ISP connection. | The question mentions the service provider, NBN/cable/fibre connection or external line. | In many home devices the modem and router are combined, but the roles are still different. |
| Firewall | Filters incoming and outgoing traffic according to security rules. | The question asks how to block unauthorised access or restrict network traffic. | A firewall does not remove malware already installed on a device. |
| Hub | Broadcasts incoming data to every connected device. | Usually appears as an older or inefficient LAN device. | Do not choose a hub when the scenario needs efficient modern traffic management. |
| Bridge | Connects two LAN segments so they can operate as part of a larger network. | The question mentions joining two similar network segments. | Do not use bridge as a generic answer for internet access. |
Traffic Path Example
Student iPad
|
Wireless access point
|
Switch ---- Classroom printer
|
Firewall
|
Router
|
Modem / ISP connection
|
Cloud service
The important exam skill is to explain the device in relation to the scenario. A switch is suitable for connecting local classroom devices. A router is suitable when the traffic must leave the LAN and reach another network.
Do and Don't
Do
- Use "within one network" for switches.
- Use "between different networks" for routers.
- Connect wireless devices to the LAN with a WAP.
- Explain the security role when naming a firewall.
Don't
- Say a router is only used for Wi-Fi.
- Use modem, router and switch as if they mean the same thing.
- Choose a hub for a modern efficient school network.
- Say a firewall protects against every possible security problem.
Possible Theory Questions and Model Answers
Question 1
A new computer room has 24 desktops and one printer. Identify a suitable device to connect them on the same LAN and justify your choice.
Model answer: A switch is suitable because it connects multiple devices within the same local area network and forwards data to the correct device instead of broadcasting to every device like a hub.
Question 2
Explain the difference between a router and a switch.
Model answer: A switch connects devices within one LAN, such as classroom computers and printers. A router connects different networks and directs packets between them, such as sending traffic from the school LAN to the internet.
Question 3
A school wants students to connect iPads to the existing wired network. Which device is needed?
Model answer: A wireless access point is needed because it lets wireless devices connect to the wired network using Wi-Fi.