Instruct: Classify a given review as either positive or negative.
Query: Isn't work paper its written on

Took the exam, I have taken many exams, including with cisco, and trust me. this book is very unreilable, and there were very many questions that the book simply didn't even mention. From usefulness stand point of view, its unworthy because its pure wishywashy theory, with very little usefulness. All in all, a terrible source for exam preparation, and a worthless source for implementing in practice.