How does the Network work?

Understanding Network Topology

How Does a Modern Network Work?

Whether it's a home, office, farm, hotel or large estate, most networks follow the same basic structure.

Think of your network like a water system:

• The internet is the water supply.

• The router is the main stopcock.

• Switches are the pipework.

• Wireless access points are taps around the building.

• Devices are the people using the water.

Each component has a specific role.

A Typical Network Layout

Internet
    │
    ▼
Modem / ONT
    │
    ▼
Router / Firewall
    │
    ▼
Network Switch
    │
 ┌──┼───────────┬─────────────┐
 ▼  ▼           ▼             ▼
Wi-Fi AP     Camera       Smart TV
                           Printer
                           Computer

1. Internet Connection

The internet connection enters the property through a service provided by:

• Openreach

• CityFibre

• Virgin Media

• Starlink

• Mobile Broadband

This is simply the connection between your property and the outside world.

2. Modem or ONT

The modem or ONT converts the provider's signal into a standard network connection.

Examples:

• Openreach Fibre → ONT

• Virgin Media → Cable Modem

• Starlink → Starlink Router/Adapter

The ONT does not manage your network.

Its job is simply to hand over the internet connection.

Think of it as the water meter outside your house.

3. Router / Firewall

The router is the brains of the network.

Its responsibilities include:

✓ Connecting your network to the internet
✓ Providing security and firewall protection
✓ Managing IP addresses
✓ Controlling traffic between devices
✓ Managing VLANs and network segregation

Without a router, devices cannot communicate with the internet.

Examples:

• UniFi Dream Machine

• DrayTek Router

• Firewalla

• pfSense

• ISP Router

Think of the router as the receptionist controlling who enters and leaves the building.

4. Network Switch

A switch expands the number of available network connections.

For example:

A router may have 4 ports.

A switch may provide:

• 8 ports

• 16 ports

• 24 ports

• 48 ports

Switches allow multiple devices to communicate simultaneously.

Typical devices connected to switches:

• Computers

• Cameras

• Wi-Fi Access Points

• Printers

• Smart TVs

• Door Access Systems

Think of the switch as a distribution hub.

5. Wireless Access Points

Access Points provide wireless coverage.

Many people mistakenly call these "routers".

A Wi-Fi Access Point:

✓ Provides wireless coverage
✓ Connects wireless devices to the network

A Wi-Fi Access Point does not:

✗ Provide internet by itself
✗ Manage security
✗ Perform routing

Examples:

• UniFi U7 Pro

• UniFi U7 Outdoor

• UniFi U6 Mesh

• Aruba Access Points

• Cisco Access Points

Think of access points as Wi-Fi transmitters.

6. End Devices

These are the devices that actually use the network.

Examples:

• Phones

• Tablets

• Laptops

• Smart TVs

• CCTV Cameras

• Printers

• Gate Controllers

• Smart Home Systems

Each device receives an IP address from the router and communicates through the switch and access points.

Example: Viewing a Camera on Your Phone

When viewing a security camera:

Phone
  │
Wi-Fi Access Point
  │
Network Switch
  │
Network Video Recorder

The traffic never needs to leave your property.

The router is not heavily involved because everything is local.

Example: Watching Netflix

Netflix
   │
Internet
   │
ONT
   │
Router
   │
Switch
   │
Wi-Fi Access Point
   │
TV

The router manages the connection between your property and Netflix.

What About Large Properties?

Modern estates often use multiple switches and access points.

Internet
    │
Router
    │
Core Switch
 ┌──┼───────┬─────────┐
 │  │       │         │
 │  │       │         │
AP Switch CCTV Switch Gate Switch
 │          │         │
APs      Cameras    Access Control

This is known as a hierarchical network design.

Benefits:

✓ Better performance
✓ Easier troubleshooting
✓ Greater reliability
✓ Easier expansion

The Automated Integrations Approach

For reliability and future growth, we typically design networks using:

1. ISP Connection / ONT

2. Enterprise Router (UniFi Dream Machine)

3. Core Managed Switch

4. Dedicated PoE Switching

5. Multiple Access Points

6. Structured Cabling

7. CCTV & Access Control Integration

This ensures every device has a clear path through the network while maintaining security, performance and reliability.

In Simple Terms

A modern network usually follows this path:

Internet
    │
Modem / ONT
    │
Router
    │
Switch
    │
Wi-Fi Access Point
    │
Device

Each component performs a different job, and together they create a fast, secure and reliable network for all devices within the property.