CCNA Configuration Foundations
Build a complete client path across an access VLAN, trunk, router gateway, default route, and access policy in the shared guided simulator.
Symptom
Build an end-to-end client path across a VLAN, trunk, router gateway, route, and access policy.
Your mission
Prove the cause, then fix it
Format
Guided CLI investigation
Investigate before you configure.
Use the CLI evidence to isolate the fault, make the smallest safe correction, then verify the network state changed.
Observe the symptom and link state.
Diagnose by comparing the protocol evidence.
Verify the expected device state and confirm the original symptom is resolved.
Console access: SW1 · R1 · PC1
This workspace stacks for portrait phones. Rotate to landscape for the full split-screen console.
Need a hint?
Reveal the root cause when you're ready.
Try the investigation first, then use this as your escape hatch, not a dead end.
Lab debrief
Turn the session into a repeatable troubleshooting pattern.
Use this reference after your attempt: first explain the symptom, then verify the evidence, then confirm the repair.
The problem
A new client network needs a VLAN, tagged uplink, router gateway, upstream route, and a policy that denies Telnet without blocking permitted traffic.
What you'll practice
- Configure a VLAN and static access port
- Build an 802.1Q uplink and router subinterface
- Add upstream routing and an ordered ACL
- Verify permitted and denied traffic end to end
The topology
PC1 connects to SW1 Gi0/1 in VLAN 10. SW1 Gi0/2 trunks VLAN 10 to R1, whose subinterface provides the gateway and forwards toward a server through 192.0.2.2.
Frequently asked
What runs in the browser, and how does it differ from a live lab?
This page uses a focused browser simulation with modeled commands and device state. It is not a full device operating system. Dedicated virtual lab sessions are a separate product; check the available topology and booking details before purchasing live time.
Ready to run this lab yourself?
No setup, no image sourcing. Book a session or ask for a live demo.