I think questions 1 may vary to a degree. I think disclosing the exact number as well as how many questions is an NDA violation. I think it is sufficient to say that there is enough time and you will reach a passing score if you know the materials very well. If you fail, you must pay again for the second attempt. I would look at the CCNA Blueprint (available at https://learningnetwork.cisco.com/docs/DOC-4975) is all you you need to know. Also worth mentioning, always consider the advantages and disadvantages of taking the two exam path.
When you go in for the exam, you first agree to the NDA, then it tells you the required score to pass, the time you have and how many questions to expect.
This link will answer some questions, but the passing score is not available until you take your test. https://learningnetwork.cisco.com/community/certifications/ccna/ccna_exam?tab=1
Excellent point, wording is key and misunderstanding what a question is asking will surely introduce you to a failed exam. People feel rushed because of the time limit of the exams and get click happy. I know it can be difficult, but taking the time to not only carefully read the question, but all of the answers is vital.
Please note that Cisco does not publish exam passing scores because exam questions and passing scores are subject to change without notice. As some users have mentioned above, the exam passing score and the exact number of questions will be displayed on the screen at the beginning your exam. You can visit the CCNA exam page for general information.
If you would like to retake a failed exam, you will be required to pay for the exam once again.
For additional information pertaining to certification exams, visit the About Certification Exams page.
Cisco Learning Network Moderator