31 Days Before Your CCNA Routing & Switching Exam offers a friendly, practical way to understand the CCNA Routing & Switching certification process, commit to taking the ICND1 (100-105) and ICND2 (200-105) exams or the CCNA (200-125) exam, and finish your preparation using a variety of Primary and Supplemental study resources.These fully updated CCNA exams test knowledge and skills needed to successfully deploy LAN switching, IPv4 and IPv6 routing, WANs, and infrastructure services; and to secure and manage modern network infrastructure.