BeginnerPublished 2026-06-24
CCNA Inter-VLAN Routing: Two Clients Across a Router
Free sample lab
Deploy, verify, and troubleshoot inter-VLAN routing with two user VLANs split across two access switches, connected via a central router. This realistic topology illustrates trunk misconfiguration, VLAN assignment, and end-to-end reachability for troubleshooting.
Learning objectives
- Configure access and trunk ports on Layer 2 switches.
- Create and assign VLANs for different user segments.
- Configure routed interfaces on a router for VLAN gateways.
- Verify and troubleshoot trunk allow-list and VLAN transport issues.
- Restore inter-VLAN connectivity between endpoints.
Troubleshooting focus
- Trunk allow-list drift resulting in missing VLAN transport.
- Native VLAN mismatches between switches.
- Host assigned to wrong access VLAN.
- Troubleshooting end-to-end connectivity between user segments.
Topology
Grade your work
How this lab is graded
- Build it your way. Where a lab lets you choose a value — a VLAN name, an interface description — grading checks that you configured it, not which name you picked. Names that another line has to reference, like an ACL applied with
access-class, are stated in the guide and do have to match. - Addresses, modes and protocol keywords are exact. An IP address, a subnet mask,
switchport mode trunk, an encapsulation — these carry the meaning of the lab, so they are graded as written in the guide. - Grading reads your saved configuration. Export the lab from CML after you have configured it, and make sure anything you set is in the running-config — a change that only exists in a terminal session never reaches the grader.
- You can submit as many times as you like. Your best score stands, and each attempt tells you which checks passed so you can work the gaps.
- Scored something you believe is correct? Use Report an issue on this page — that is exactly how the grading fixes in the changelog got found.
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