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This lesson compares wired and wireless network connections, covering Ethernet, WiFi, and Bluetooth. This is part of OCR J277 Section 1.3.1.
A wired connection uses physical cables to connect devices to a network. The most common type is Ethernet.
| Feature | Detail |
|---|---|
| Cable type | Typically Cat5e or Cat6 twisted pair copper cables; fibre optic for high-speed/long-distance |
| Connector | RJ-45 connector |
| Speed | 100 Mbps (Fast Ethernet), 1 Gbps (Gigabit Ethernet), 10 Gbps (10 Gigabit Ethernet) |
| Range | Up to 100 metres for copper cables; much further for fibre optic |
| Reliability | Very high — not affected by interference from other devices or walls |
| Security | High — physical access to the cable is required to intercept data |
| Feature | Detail |
|---|---|
| How it works | Transmits data as pulses of light through thin glass or plastic fibres |
| Speed | Very high — up to 100 Gbps or more |
| Range | Very long — suitable for undersea cables and backbone networks |
| Interference | Not affected by electromagnetic interference |
| Cost | More expensive than copper cables |
| Use | Internet backbone, ISP connections, data centres |
A wireless connection uses radio waves or infrared signals to transmit data without physical cables.
| Feature | Detail |
|---|---|
| How it works | Devices communicate with a WAP (Wireless Access Point) using radio waves |
| Standards | 802.11n (WiFi 4), 802.11ac (WiFi 5), 802.11ax (WiFi 6) |
| Speed | Varies by standard — WiFi 6 can reach ~9.6 Gbps (theoretical maximum) |
| Range | Typically 30-50 metres indoors; affected by walls and obstacles |
| Security | Must use encryption (WPA2 or WPA3) to prevent interception |
| Use | Laptops, smartphones, tablets, IoT devices |
| Feature | Detail |
|---|---|
| How it works | Short-range wireless communication using radio waves |
| Speed | Lower than WiFi — up to 3 Mbps (Bluetooth 4.0) or 50 Mbps (Bluetooth 5.0) |
| Range | Short — typically 10-100 metres |
| Power | Very low power consumption |
| Use | Wireless headphones, keyboards, mice, smartwatches, file transfer between nearby devices |
| Feature | Wired (Ethernet) | Wireless (WiFi) |
|---|---|---|
| Speed | Generally faster and more consistent | Can be fast but varies with distance and interference |
| Reliability | Very reliable — not affected by interference | Can be affected by walls, other devices, and distance |
| Security | More secure — requires physical access to the cable | Less secure — signals can be intercepted; must use encryption |
| Mobility | Limited — device must be near a cable/port | High — devices can move freely within range |
| Cost | Higher installation cost (cabling throughout building) | Lower installation cost (no cables needed) |
| Setup | More complex (laying cables, sockets) | Simpler (just need a WAP) |
| Interference | Minimal (copper can be affected by EM interference; fibre is immune) | Can be affected by other wireless devices, microwaves, walls |
| Bandwidth sharing | Each device has its own cable (no sharing) | All devices share the wireless bandwidth |
flowchart LR
Choice{Wired or Wireless?}
Choice -->|Fixed location, max speed| Wired[Wired Ethernet / Fibre]
Choice -->|Needs mobility| Wireless[Wireless WiFi / Bluetooth]
Wired --> W1[Higher speed]
Wired --> W2[More reliable]
Wired --> W3[More secure]
Wired --> W4[Limited mobility]
Wired --> W5[Higher install cost]
Wireless --> R1[Mobile and flexible]
Wireless --> R2[Easier setup]
Wireless --> R3[Variable speed]
Wireless --> R4[Interference risk]
Wireless --> R5[Needs WPA2/WPA3]
| Scenario | Best Choice | Reason |
|---|---|---|
| Desktop computers in an office | Wired (Ethernet) | Speed, reliability, and security |
| Laptops and tablets in a school | Wireless (WiFi) | Mobility — students move between rooms |
| Gaming (competitive, low latency) | Wired (Ethernet) | Consistent speed with minimal latency |
| Connecting a smartwatch to a phone | Wireless (Bluetooth) | Short range, low power, no cables |
| Server connections in a data centre | Wired (Fibre optic) | Maximum speed and reliability |
| Smart home devices (IoT) | Wireless (WiFi/Bluetooth) | Convenience, no cables throughout the home |
Because wireless signals travel through the air, they can be intercepted. Security measures include:
| Measure | Description |
|---|---|
| WPA2/WPA3 encryption | Encrypts data transmitted over WiFi so it cannot be read if intercepted |
| Strong password | The WiFi network should use a strong, unique password |
| SSID hiding | The network name can be hidden so it does not appear in public WiFi lists |
| MAC address filtering | Only devices with approved MAC addresses can connect |
OCR Exam Tip: If asked about the advantages and disadvantages of wireless over wired, always consider: speed, reliability, security, mobility, and cost. These are the five key comparison points.
| Feature | WiFi | Bluetooth |
|---|---|---|
| Range | 30-50 m indoors | 10-100 m |
| Speed | Much faster | Slower |
| Power | Higher | Very low |
| Devices | Many can connect to one WAP | Typically pairs (1-to-1 or small groups) |
| Use | Internet access, networking | Peripherals, wearables, audio |
Key Vocabulary: Ethernet, fibre optic, WiFi, Bluetooth, WAP, WPA2, WPA3, bandwidth, latency, RJ-45, Cat5e, Cat6, 802.11.
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