Network fundamentals, subnetting, and networking practice platforms.
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- Learning About Electronics - Networking Quizzes Free
- Free networking quizzes covering TCP/IP, subnetting, and network fundamentals.
- NetSandbox Free
- Browser-based network design tool with drag-and-drop topology builder, protocol validation, and STP/OSPF/BGP simulation.
- Open Networking Lab Free
- Free browser-based network simulator from the Open University for designing, configuring, and testing virtual networks.
- OSI Model Simulator Free
- Interactive OSI layer simulator showing step-by-step data encapsulation through all seven layers with real protocols.
- PacketTrainer Free
- Free interactive Cisco IOS command exercises with simulated terminal and instant validation.
- ProProfs Networking Quizs Free
- Free networking quizzes covering various networking topics.
- Subnetting Practice Free
- Free subnetting questions and practice tests for CCNA exam preparation.
- Subnetting.net Free
- Free subnetting practice questions and tutorials with multiple difficulty levels.
- Connected Dots Online Freemium
- Interactive browser-based network device simulators for subnetting, VLANs, routing, OSPF, and DHCP with hands-on labs.
- NetworkAcademy.io Freemium
- CCNA practice tests and quizzes covering OSI model, IP addressing, routing, and switching fundamentals.