TestKing CCNA 640-801 v108 | 15.8 Mb In pursuing a Cisco certification, the first mile marker one will encounter along the path is the Cisco Certified Network Associate (CCNA) certification. This certification is designed to validate a solid foundation of networking skills, including a basic knowledge of the OSI reference model, networking protocols, Layer 2 switching concepts and protocols, routing concepts and protocols, and wide-area networking (WAN) connectivity. A person who achieves CCNA certification should have the skills necessary to provide basic network installations and level 1 troubleshooting skills.