About NETCAD

Practical network engineering guides, Cisco Packet Tracer labs, and data science education.

Our Mission

NETCAD (accessible at netcad.company) was founded with a single driving mission: to bridge the gap between abstract computer networking theory and hands-on, real-world practical application.

Too many computer science and IT students study protocols like 802.1Q trunking, Spanning Tree, OSPF, and EtherChannel on paper without ever configuring them on real CLI terminals or virtual topologies. NETCAD solves this by pairing in-depth, beginner-to-advanced architectural tutorials with completely free, pre-configured downloadable Cisco Packet Tracer (.pkt) lab files and PDF configuration workbooks.

Meet the Founder & Lead Instructor

Sithija Mudalige

Founder, Network Systems Specialist & Technical Author

Sithija is an IT and networking enthusiast based in Sri Lanka, focusing on enterprise routing, switching architectures, Cisco CCNA curriculum preparation, and modern Python data analytics.

Having built virtual lab environments and studied complex protocol behaviors extensively, Sithija creates and tests every tutorial and Packet Tracer file available on NETCAD to ensure they reflect true enterprise network design standards.

Editorial & Lab Verification Standards

  • 100% Tested Lab Topologies: Every Packet Tracer (.pkt) and Jupyter Notebook (.ipynb) file is physically deployed, simulated, and tested for end-to-end connectivity before it is published.
  • Authentic Technical Depth: We do not publish thin definitions or automated summaries. Our articles include ASCII network topology diagrams, genuine Cisco IOS CLI syntax, command verification outputs (show ip route, show etherchannel summary), and architectural trade-off comparisons.
  • Open & Free Education: All lab downloads, configuration PDF workbooks, and core tutorials are 100% free for students, network administrators, and certification candidates worldwide.

Have a question about a lab, found an issue, or want to suggest a new networking protocol guide?

Get in Touch with Sithija