The CCNA certification could be considered as an entry certification into the inter networking career. It's an important base for your internetworking career ahead and also a pre-requisite for Cisco professional level certifications.
The Cisco CCNA network associate certification validates the ability to install, configure, operate, and troubleshoot medium-size routed and switched networks, including implementation and verification of connections to remote sites in a WAN. This new curriculum includes basic mitigation of security threats, introduction to wireless networking concepts and terminology, and performance-based skills. This new curriculum also includes (but is not limited to) the use of these protocols: IP, Enhanced Interior Gateway Routing Protocol (EIGRP), Serial Line Interface Protocol Frame Relay, Routing Information Protocol Version 2 (RIPv2),VLANs, Ethernet, access control lists (ACLs).

• Describe how a network works
• Configure, verify and troubleshoot a switch with VLANs and interswitch communications.
• Implement an IP addressing scheme and IP Services to meet network requirements in a
  Enterprise branch office network.
• Configure, verify, and troubleshoot basic router operation and routing on Cisco devices
• Explain and select the appropriate administrative tasks required for a WLAN
• Identify security threats to a network and describe general methods to mitigate those threats
• Implement, verify, and troubleshoot NAT and ACLs in a medium-size branch office network.
• Implement and verify WAN links

OR
Required Exam(s) Recommended Training
640-822 ICND1
Interconnecting Cisco Networking Devices Part 1 (ICND1) v1.0
640-816 ICND2
Interconnecting Cisco Networking Devices Part 2 (ICND2) v1.0