CCNA Routing and Switching: What It Covered and What to Learn Today
CCNA Routing and Switching was a Cisco certification focused on the core skills needed to install, configure, and troubleshoot small and medium-sized networks. Although the certification has been retired, its foundational topics remain important for network technicians, support professionals, and anyone beginning a career in networking.
What Was CCNA Routing and Switching?
The Cisco Certified Network Associate (CCNA) Routing and Switching credential validated practical knowledge of network fundamentals and Cisco networking equipment. Candidates learned how devices communicate across local and wide area networks, how switches forward traffic, and how routers connect different networks.
The certification could be earned through a two-exam path or a single composite exam. Cisco retired the Routing and Switching track in February 2020 as part of a broader certification program update. Its material was consolidated into the current CCNA certification, which covers a wider range of networking concepts.
Core Routing and Switching Concepts
Switching
Switches connect devices within a local area network (LAN). A key switching concept is the MAC address table: a switch learns which devices are reachable through each port and uses that information to forward Ethernet frames. Students also studied VLANs, which divide a physical network into separate logical segments, and trunk links, which carry traffic for multiple VLANs between network devices.
Routing
Routers move packets between different IP networks. Routing knowledge includes IP addressing and subnetting, default gateways, routing tables, and the distinction between static routes and dynamic routing protocols. These concepts help network professionals understand how traffic finds a path from its source to its destination.
Network Services and Security
Routing and switching studies also introduced services and protections commonly used in enterprise networks. Topics included DHCP for assigning IP addresses, NAT for translating addresses, access control lists for filtering traffic, and basic network security practices. Understanding how these features work together is useful when configuring or troubleshooting a network.
Troubleshooting
Certification preparation emphasized a methodical approach to troubleshooting. Network professionals need to identify symptoms, check physical connections and configurations, verify addressing and routing, and use diagnostic commands to narrow down the cause of a problem. Clear documentation and careful testing are just as important as technical knowledge.
Why These Skills Still Matter
Even though the old certification is no longer available, routing and switching remain central to networking. Modern environments may include wireless access, cloud services, automation, and software-defined technologies, but they still rely on fundamental principles such as IP addressing, Ethernet, VLANs, routing, and troubleshooting.
These skills are useful in roles such as network technician, IT support specialist, junior network administrator, and network operations center (NOC) technician. They also provide a foundation for more advanced study in areas such as enterprise networking, cybersecurity, and network automation.
How to Study Routing and Switching Today
- Learn networking fundamentals: Study the OSI and TCP/IP models, Ethernet, IPv4 and IPv6, subnetting, and common network services.
- Practice switching and routing: Work with VLANs, trunks, routing tables, static routes, and dynamic routing concepts.
- Use hands-on labs: Practice configuring and troubleshooting devices in a simulator, lab environment, or supported virtual platform.
- Build a troubleshooting routine: Use show commands and other diagnostic tools to check device status, interfaces, addressing, and routes.
- Review Cisco’s current certification information: For a Cisco credential, check Cisco’s official website for the current CCNA exam topics and requirements.
CCNA Routing and Switching vs. Today’s CCNA
The retired CCNA Routing and Switching track concentrated mainly on traditional routing and switching. The current CCNA is a broader entry-level certification that includes foundational networking alongside areas such as security, automation, and programmability. The exact exam objectives can change, so candidates should consult Cisco’s official materials before choosing study resources.
Conclusion
CCNA Routing and Switching helped many professionals develop practical networking skills, and the concepts behind it remain valuable today. Whether you are exploring networking for the first time or preparing for a current certification, a strong understanding of switching, routing, IP addressing, and troubleshooting is an excellent place to start.
6 Essential CCNA Routing and Switching Tips
- Practice subnetting until it feels automatic.
- Learn how VLANs separate broadcast domains.
- Configure trunk ports and verify allowed VLANs.
- Understand how STP prevents switching loops.
- Practice static routes and OSPF basics.
- Use show commands to verify configurations.
Practice subnetting until it feels automatic.
Practice subnetting until it feels automatic. Being able to quickly determine network addresses, usable host ranges, and broadcast addresses helps you configure networks and troubleshoot connectivity with confidence. Work through problems regularly, check your answers, and focus on understanding how subnet masks divide an address—not just memorizing shortcuts. This skill will save time in CCNA study and in real-world routing and switching tasks.
Learn how VLANs separate broadcast domains.
Learn how VLANs separate broadcast domains by grouping devices into distinct logical networks, even when they share the same physical switch. Broadcast traffic stays within its VLAN, which can reduce unnecessary network traffic and help organize devices by team, function, or security needs. To communicate between VLANs, traffic must pass through a Layer 3 device, such as a router or multilayer switch.
Configure trunk ports and verify allowed VLANs.
When configuring a trunk port, make sure both ends of the link use compatible settings and that the trunk allows only the VLANs needed for that connection. On Cisco switches, you can configure the allowed VLAN list with a command such as switchport trunk allowed vlan 10,20,30. Then verify the trunk status and VLAN list with show interfaces trunk, and confirm that the VLANs exist and are active using show vlan brief. Checking both ends helps catch mismatched settings that can prevent devices in the expected VLANs from communicating.
Understand how STP prevents switching loops.
Understanding how Spanning Tree Protocol (STP) prevents switching loops is essential when studying CCNA routing and switching. Redundant links between switches improve network availability, but they can also create loops that cause broadcast storms and duplicate frames. STP detects redundant paths and places selected ports in a blocking state, leaving a loop-free path for traffic while keeping backup links available if the active path fails. Knowing how STP selects paths and changes port states can help you troubleshoot connectivity issues and design more reliable networks.
Practice static routes and OSPF basics.
Practice configuring static routes and reviewing the basics of OSPF, a dynamic routing protocol commonly used to share network information. Start by adding static routes and checking the routing table to confirm traffic follows the expected path. Then explore how OSPF discovers neighbors, exchanges route information, and selects paths. Use a network simulator or lab to test different topologies and troubleshoot misconfigurations—hands-on practice makes these routing concepts easier to understand and apply.
Use show commands to verify configurations.
Use Cisco IOS show commands to verify that a device is configured and operating as expected. For example, show running-config displays the active configuration, while show ip interface brief summarizes interface status and IP addresses. Commands such as show vlan brief and show ip route can help confirm VLAN assignments and routing information. Compare the output with your intended configuration, and investigate any unexpected values before making further changes.