Most Useful JNCIA Exam Prep Books
The Juniper Networks Certified Associate - Junos (JNCIA-Junos) is a entry level certificate from Juniper Networks. It is a great certificate to have if you are looking to advance your networking career.
The JNCIA is sometimes overshadowed by Cisco's CCNA. Because the JNCIA is less common, having this certificate will make you stand out from the crowd of CCNA holders and will instantly make you more valuable by employers that use Juniper gear.
The problem with the JNCIA is that finding a good, up to date book can be difficult.
The most important thing when studying for an industry certificate is a good book. A good book will help you find what topics to study, how in depth you need to go, and will prepare you for the types of questions on the exam. Everything else you do while preparing for the exam is secondary to a good book. Even experienced network engineers need a good book. There are parts of the JNCIA exam that are less common in day-to-day networking life. Because of this, those with real-life experience should use a book to review.
The Best JNCIA prep book
Junos Enterprise Routing: A Practical Guide to Junos Routing and Certification
This is the book I used when I was studying for the JNCIA and I was able to pass the exam on my first try.
This is a 2011 JUNOS book by three senior network engineers. It's a 768 page book filled with explanations and details on the JUNOS operating system. The JUNOS operating system is what runs juniper networking gear. The JNCIA is really an exam about the JUNOS operating system, so this book is about as good as you will find for passing the exam.
Though this book is not specifically targeted at the exam, it is the best book for passing the JNCIA. The best way to study for the JNCIA is to look at the exam objectives and study those topics in this book.
This book is a little bit older than I would have liked, but the commands in JUNOS remain largely the same.
The best part about this book is that it is a very thorough guide to Juniper gear. I have used it as a reference many times since I passed the JNCIA exam. It's been great for my day to day networking career along with being a good study resource.
JNCIA-Junos Certification Exam Review Questions and Answers
This is an up to date book featuring practice questions and answers. This is currently the most up to date JNCIA book that is specifically targeting the exam. This book is good if you need additional practice questions.
JUNOS Fundamentals: The Official Study Guide for JNCIA Certification and Junos Administration
This is an out of date and our of print book that is pretty hard to find. The exam has changed since this book was printed, and I would not bother with it. If you are absolutely desperate for more resources, this book might help by explaining how the exam is structured. Some of the topics in this book are still relevant.