The importance of certification is to measure and to show your competencies formally through legal document. certification also show you the level of your ability in specific skill or knowledge. It can be used to get higher salary from the employee :). CCNA is first step that should be taken to measure you knowledge and ability in internetworking.
The output of CCNA sertification
Install, configure, and operate LAN, WAN, and wireless access service securely, as well as troubleshoot and configure small to medium network (500 nodes or fewer) for performance :
Knowledge needed :
- serial connections
- Frame Relay
- LAN Switching
- access lists