Cisco Certified Design Associate (CCDA®) validates knowledge required to design a Cisco converged network. With a CCDA certification, a network professional demonstrates the skills required to design routed and switched network infrastructures and services involving LAN, WAN, and broadband access for businesses and organizations. The CCDA curriculum includes designing basic campus, data center, security, voice, and wireless networks.

CCNA level knowledge and BCMSN level knowledge is needed to prepare for the CCDA certification exam.

To become a CCDA you need to take the exam  640-863