Network Diagram with Firewall
Visualizing Secure and Structured Network Architecture
What Is a Network Diagram?
A network diagram is a visual map of your IT infrastructure Shows how devices like routers, switches, servers, and endpoints connect Helps in planning, troubleshooting, and securing your network
Why Include a Firewall?
Firewalls protect against unauthorized access and cyber threats
Control inbound and outbound traffic based on security rules
Act as a barrier between trusted networks and external sources
Firewall Placement in Diagrams
At the perimeter (between internal network and internet)
Between internal segments for microsegmentation
In front of critical servers or applications
Integrated into the DMZ for public-facing services
Key Elements in the Diagram
Router
Firewall (with defined rules)
Switch and internal devices (PCs, servers, endpoints)
VPN Gateway
DMZ with web/email servers
Color-coded zones (internal, external, restricted)
Final Tips for Building One
Use tools like Visio, Lucidchart, or Draw.io
Keep it updated as your network evolves
Highlight trust zones and data flow paths
Always include multiple layers of firewall protection where needed