To gain the CCNA certification you can either take two exams or combine them into one single exam.
If you decide to take the split route, the two exams will include:
100-101 – Interconnecting Cisco Networking Devices Part 1 (ICND1)
200-101 – Interconnecting Cisco Networking Devices Part 2 (ICND2)
If decide you only want to take one test, the exam will include:
200-120 – Interconnecting Cisco Networking Devices (Composite)
When studying for these exams, it’s best to prepare the way that works for you. For those who have some experience with networking, self-study is a popular option, and you can do so using any number of available resources.