Original network engineering labs

Learn networks.By fixing them.

Take the ticket. Investigate the evidence. Fix the network. Start with a hands-on Juniper troubleshooting simulation.

Launch simulator →Open network tools

Juniper foundationsDesktop workspaceReset and practise

OSPF3 routersTroubleshooting15–20 min

The toolkit

Every address.
Accounted for.

Find subnet boundaries, usable ranges and masks in a moment. IPv4 Subnet Studio runs entirely in your browser.

Open Subnet Studio

Featured lab

OSPF Neighbour Repair.

Three routers. One broken adjacency. Inspect the fault, restore the routes and prove the fix.

LAB-001 / ROUTING

Restore the routing domain

Three routers, two user LANs and one intentionally broken OSPF relationship. The lab is designed to reward methodical verification rather than configuration guessing.

OSPFAdjacencyRouting tableTroubleshooting

View lab blueprint →

LAB-001 / R2 CONSOLE

r2> show ospf neighbor
Neighbor        State
10.0.0.1        Full
10.0.0.3        Init

r2> show interfaces terse
ge-0/0/1.0      up    up

# Objective
Restore FULL adjacency to R3

Lab philosophy

Observe. Change. Prove.

The labs are built around a repeatable troubleshooting loop: inspect the current state, form a hypothesis, make a controlled change and validate the outcome.

Browse technical notes →

ObserveInterfaces, neighbours, tables and logs

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ReasonIdentify the smallest likely failure domain

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ChangeApply one controlled configuration fix

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ValidateProve control-plane and data-plane recovery

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Learn networks.By fixing them.

Every address.Accounted for.

OSPF Neighbour Repair.

Restore the routing domain

Observe. Change. Prove.

Every address.
Accounted for.