1. Cert-Ex Network Simulator : How to load a lab exercise and execute the related instructions in the console network simulator
https://youtu.be/5W8H2YHo6CY
2. Cert-Ex Network Simulator : How to create a simple router network using the network designer
https://youtu.be/wUlhS5RliEU
3. Cert-Ex Exam Simulator : Various question types supported by exam simulators
https://youtu.be/5CudDtAenow