A full-length rehearsal: the same number of questions and time as a typical CCNA sitting, spread across the six domains in the proportions Cisco publishes. You see no answers until the end, then a score per domain and an explanation for every question.
The real exam varies in length (roughly 100 to 120 items) and includes simulations, which a web page can't reproduce. Treat a score of 85% or more here as a sign you're ready. To practise one domain at a time, use the practice questions.
100 questions, 120 minutes, no feedback until the end. Questions per domain follow the exam weights: