Hi@Mahesh,
Working with routed and switched networks is a fundamental skill that is very necessary when starting a career in networking. The Cisco CCNA (Cisco Certified Network Associate) certification has a strong focus on these topics and will teach you how to install, configure, and manage a medium-sized network.
The topics covered during the Cisco CCNA course include the topics covered in the CCENT curriculum as well as the configuration of Ethernet LAN, WAN, Ipv4 services, Ipv4 routing and troubleshooting, Ipv6 routing and working with cloud-based networks.