The Cisco Certified Network Associate (CCNA®) certification is an "associate" level certification in Cisco's certification pyramid. It confirms the ability to install, configure, operate, and troubleshoot small and medium-sized routers and switches.
The Cisco CCNA certification must first be obtained before the CCNA Voice, CCNA Wireless, CCNA Security, or CCNA Service Provider Operations certifications can be achieved (unless you already possess a CCIE certification).