Start with Juniper foundations: investigate a ticket, inspect the CLI, commit a controlled fix and verify the user’s connection. Your practice session is isolated and can be reset at any time.
A workstation lost application access after a maintenance change. Inspect the Juniper router and the affected client, restore service and prove the fix.
Desktop required · Bounded CLI simulation · Private browser session
Scenario: R2 can form an adjacency with R1 but not R3. LAN-A and LAN-B cannot communicate. Inspect the neighbour state, identify the mismatch, restore FULL adjacency and prove route propagation.
Scenario: A branch has two upstream paths and is exiting through the wrong provider. Diagnose the selected path and use routing policy to prefer the intended exit while keeping the backup valid.
Scenario: A client receives no service after a switch change. The access port looks correct, but the VLAN disappears somewhere upstream. Trace the L2 path and repair the trunk configuration.
Scenario: A user segment needs one specific service in a server zone while all other east-west traffic remains blocked. Inspect the policy intent, implement the minimum rule set and validate both allowed and denied flows.
The foundations simulator models configuration and reachability on the server. Browser sessions are isolated, changes persist on refresh, and reset restores the original ticket. The advanced scenarios above remain blueprints.