The CCNA certification is the first step to becoming a network engineer. It is one of the most popular certifications in the IT industry and it is also one of the most important ones. The CCNA certification exam tests your knowledge of networking concepts and protocols, configuration, troubleshooting, and security. It includes topics on LAN switching technologies, IPv4 and IPv6 routing technologies, WAN technologies, infrastructure services (DHCP server configuration), infrastructure maintenance (router configuration) as well as network security (firewalls). You can prepare for this exam by taking an online course or by reading books on networking. You can also take a boot camp to help you learn about all these topics.