Networks & Remote Access Grade 12
Essential network components, internet connection methods, file sharing, and remote access technologies.
A small-scale network connecting the devices within a single home — routers, computers, smart TVs, smart-home devices, etc. It's essentially a LAN (Local Area Network), just applied specifically to a residence rather than an office or school.
Essential Network Hardware
| Component | Function |
|---|---|
| NIC | Network Interface Card — hardware that connects a device to a network (wired or wireless) |
| Switch | Connects devices on a LAN and forwards data only to the intended device (not broadcast like a hub) |
| Router | Connects different networks; routes packets; assigns IP addresses; acts as gateway to ISP |
| Modem | Converts digital signals to analogue for telephone lines (and back); connects to ISP |
| Wireless access point | Enables wireless devices to connect to a wired network via Wi-Fi |
| All-in-one home router | Combines modem + router + switch + Wi-Fi access point in one device |
A switch only ever operates within one network — it forwards data to the correct device on the same LAN. A router operates between different networks and finds the best path from one to another. The box on your wall at home combines both — but in the exam, describe each function separately.
IP Address vs MAC Address
Every device on a network needs an address, but there are two different kinds working at the same time.
| IP Address | MAC Address | |
|---|---|---|
| Assigned by | The network, often automatically via DHCP | The manufacturer — burnt into the NIC |
| Changes? | Yes — a new one is assigned when the device joins a different network | No — permanent and globally unique |
| Purpose | Logical address used to route data between networks | Physical address used to identify a device on its own local network |
A MAC address never changes, no matter which network the device connects to. An IP address usually does change — it identifies where a device currently is, not which physical device it is.
Wired Communication Media
| Medium | Speed | Range | Notes |
|---|---|---|---|
| UTP cable (Ethernet) | Up to 10 Gbps | 100m per segment | Common in offices and schools; easy to install |
| Fibre optic | Up to Tbps | Kilometres | Uses light; most secure; expensive to install |
| Coaxial | Moderate | Hundreds of meters | Older standard; still used in some broadband |
Connecting to the Internet
| Technology | Description | Speed |
|---|---|---|
| ADSL | Uses telephone copper lines; download faster than upload | Up to ~20 Mbps |
| Fibre | Light through fibre optic cables; fastest and most reliable | 100 Mbps–1 Gbps+ |
| WiMAX | Long-range wireless; used in rural/remote areas | Moderate |
| 4G/LTE | Mobile broadband; widely available | 5–100 Mbps |
| 5G | New generation mobile; very low latency; supports IoT | 50 Mbps–10 Gbps |
| Satellite | Signal sent to/from an orbiting satellite; works almost anywhere, even where no cables or towers exist | Slower and higher latency than fibre or mobile data; often more expensive |
Bandwidth, Data Caps & Throttling
| Term | Measured in | Meaning |
|---|---|---|
| Bandwidth | Mbps (megabits per second) | How fast data can be transferred — the maximum capacity of the connection |
| Data cap | GB (gigabytes) | How much total data may be used in a billing period |
| Throttling / shaping | — | The ISP deliberately reducing speed — often once a data cap is exceeded, or for specific traffic types (e.g. streaming) at any time |
Being capped doesn't slow you down at all — until you exceed the limit. Being shaped/throttled can slow specific traffic types at any time, cap or no cap. Don't confuse "how fast" (bandwidth), "how much" (data cap) and "deliberately slowed" (throttling).
File and Folder Sharing
On a network, users can share resources. Access can be restricted by permission level:
| Permission Level | What the user can do |
|---|---|
| No access | Cannot see the shared resource |
| Read-only | Can view/copy files but not modify or delete |
| Read/Write | Can view, copy, modify files |
| Full control (Admin) | Can do everything including change permissions |
Remote Access
Accessing a device or network from a physically different location.
Sending private data across the open internet is like carrying cash through a busy public street — anyone could grab it. A VPN is like an armoured van driving through that same street: it builds a sealed, encrypted "tunnel" so that, even though your data travels over the public internet, no one on the outside can see or reach what is inside. That is how an employee at home can safely reach the private company network.
| Type | Description | Example |
|---|---|---|
| LAN remote access | Access another computer in the same building | Shared folder on school server |
| Internet remote access | Access home/work resources from anywhere | Google Drive, OneDrive, Remote Desktop |
| VPN | Encrypted tunnel over internet; secure remote access to private network | Employee working from home via company VPN |
Cloud Storage and Sharing
- Store and access files from any device, anywhere
- Automatic backup and version history
- Collaboration: multiple users edit the same file simultaneously
- Examples: Google Drive, OneDrive, Dropbox
BitTorrent (Peer-to-Peer Sharing)
Files are split into small pieces and downloaded simultaneously from many peers.
- Legal uses: distributing Linux distros, large software updates
- Risks: often used for piracy; your IP is visible to all peers