CCNA is Cisco's entry-level certification that validates skills to install, configure, operate, and troubleshoot medium-sized routed and switched networks. Candidates must pass either exam 640-802 or exams 640-822 and 640-816 to earn CCNA certification. These exams test knowledge of networking fundamentals, security, routing, switching, and WAN technologies through multiple choice, drag and drop, testlets, and simulation questions.