A Beginner's Guide to Routing and Switching
Routing and switching are the core of networking. Switching moves data within a local network (Layer 2, using MAC addresses), while routing moves data between networks (Layer 3, using IP addresses). Together they connect the entire network.
Switching basics
A switch connects devices within a local network. It learns MAC addresses and forwards frames only to the correct port, keeping the LAN efficient. VLANs let one switch host multiple logical networks.
Routing basics
A router connects different networks and decides the best path for each packet using IP addresses and routing protocols like OSPF. Without routers, networks could not talk to each other or reach the internet.
How they work together
Switches build the local network; routers connect those networks together. A packet is switched to reach its gateway, then routed toward its destination network. Learn the key terms in our glossary, or master it hands-on in the CCNA course.
Frequently asked questions
What is the difference between routing and switching?
Switching forwards frames within a LAN using MAC addresses (Layer 2); routing forwards packets between networks using IP addresses (Layer 3).
Do I need both for CCNA?
Yes. Routing and switching are the heart of the CCNA exam and real networking.
Is switching Layer 2 or Layer 3?
Traditional switching is Layer 2, but Layer 3 switches can also route between VLANs.
Related articles
Want hands-on training?
Learn this on real Cisco lab devices with placement support at Attila Technologies, Ahmedabad.