CCNA Quiz, developed by Our Mobile, is a free Android application that enables you to train for CCNA certification exams. The app is easy to use and offers two modes: Training and Exam. The training mode generates 15 questions randomly, allowing you to see the answer and explanation. The exam mode simulates the real exam, enabling you to pass to the next level if the passing score of 61% is achieved, mark questions for later review, and validate the exam to see the result.

CCNA Quiz is structured into levels, each representing an axis of the certification program. The app offers the possibility to see stats and curve progression for every level. It also provides the option to see questions with exhibits. The app requires internet connectivity, but it offers a lightweight offline mode.

Overall, CCNA Quiz is an excellent application for those preparing for CCNA certification exams. Its user-friendly interface, training and exam modes, level structure, and progress tracking make it an invaluable tool.