Cisco Certified Network Associate (CCNA) is a popular certification for computer network engineers provided by the company named Cisco Systems. It is valid for all types of engineers including entry-level network.

• Internetworking
• Introduction To TCP/IP
• Subnetting, Variable Length Subnet Masks (VLSMs), and Troubleshooting TCP/IP
• Cisco’s Internetworking Operating System (IOS)
• Managing a Cisco Internetwork
• IP Routing
• Enhanced IGRP (EIGRP) and Open Shortest Path First (OSPF)
• Layer 2 Switching and Spanning Tree Protocol (STP)
• Virtual Lans (VLANs)
• Security
• Network Address Translation (NAT)
• Internet Protocol Version 6 (IPV6)
• Internet Protocol Version 6 (IPV6)
• Wide Area Networks
• HSRP (Hot Stand By Routing Protocol)