The subject is definitely the crux of the issue with Boson's software. In ONE practice test, I was given 3 incorrect answers(checked with CCIE assoiate of mine).

When you combine the lack of accuracy with a UI design that prohibits being able to see the question AND the network diagram, or that has you spending more time moving windows around so you can see the exhibit and the question or network makes the experience more than useless.

Bottom Line: The FREE version isn't worh the price.

It's very useful for me to understand the concepts inside CCNA through your questions and helpful for the exam preparation also.

Boson's router simulator helped me to becom a CCNA professional. Before I even think about hooking up the real network, I can test it with this router simulator. It saved me time and money. It's a really great product.