What is the best way to prepare for Cisco 100-105 ICND1 exam? 1. Buy the official Cisco study guide and learn at least 2 to 3 hours a day. 2. Buy practical exams from a well-known Pass4itsure supplier. (https://www.pass4itsure.com/100-105.html 100-105 dumps Q&As: 773) 3.Have hands-on practice for answering simulation type questions.4.Preparation usually takes 2 to 3 months. Once you feel confident, take the actual exam.