Module 09 · Section 1.3.2
Wired vs Wireless
Ethernet uses physical cables. Physical connection. Highly reliable and immune to airborne interference.
- ✓High bandwidth — supports Gigabit speeds.
- ✓Secure — data cannot be easily intercepted.
- ✓Low latency — consistent response times.
- ✗Restricted mobility — devices must remain connected.
Wi-Fi uses Radio waves. Wireless connection. Signals propagate through the air and can be obstructed.
- ✓High mobility — connect from anywhere within range.
- ✗Subject to interference from walls and obstacles.
- ✗Lower security — signals can be intercepted.
- ✗Lower bandwidth than wired.
Interference level: 0
⚠ Examiner Warning: Interference Detail
Saying wireless is "slow" is too vague. State it is weakened by interference from physical obstacles or has lower bandwidth.
Bluetooth is a short-range wireless technology. Primarily used for Personal Area Networks (PAN).
- ✓Low power — ideal for battery-powered peripherals.
- ✓Ad-hoc — connects devices directly without a WAP or switch.
- ✗Short range — typically limited to 10 metres.
- ✗Low bandwidth — unsuitable for large file transfers.
| Feature | Eth | Wi-Fi | BT |
|---|---|---|---|
| Range | ~100m | ~50m+ | ~10m |
| Power | High | Med | Low |
| Usage | LAN | LAN | PAN |
Mode: Ethernet
Ethernet: Physical connection, high reliability