FAULTLINE

Learn networking
by fixing it.

Faultline gives you a broken topology, an IOS-style CLI, and a real incident to investigate. Your score comes from live network behaviour — not from whether your configuration resembles an answer key.

EXAMPLE INCIDENTR1 · live session

              
Illustrative output · actual labs use live sessionsnetwork state verified
24 labs across multiple vendors
Hands-on labs covering essential CCNA and CCNP topics
Real packet delivery
Connectivity objectives send actual ICMP through the topology.
NOC Mode
Join the Network Operations Centre and get assigned to troubleshoot real-world company networks.
01 · Real infrastructure

Real networks.
Real packet delivery.

See the path, not just the result.

Every lab drops you into a network that’s already running — and already broken. There’s nothing to design and nothing to build: your job starts with a symptom, a live topology, and a CLI. Trace the path, find where it actually stops working, and fix it.

01
The topology is already liveYou’re handed a running network, not a blank canvas — every device is already deployed and cabled.
02
Failures are real, not scriptedA dropped link or a bad neighbor statement changes what the network actually does, right now.
03
Fixes are provableWhen service comes back, the path, the counters, and the reply all agree — not just the config.
A fix isn’t done until the packet actually gets through.
Branch topology / live view
PATH ACTIVE
PC1CLIENT SW1SWITCH R1ROUTER R2ROUTER R3ROUTER SW2SWITCH APP1SERVER
path trace / current observation
PC1 -> SW1 -> R1UP
R1 -> R2 / OSPFFULL
R2 -> SW2 -> APP1UP
Delivery2 / 2 replies
Hops06
Latency2.4 ms
02 · NOC Story Mode

Train like you’re
in a NOC

A realistic ticket arrives first. The lab is the investigation. The reply at the end belongs to a customer, not a score screen.

A symptom arrives before a solution.

FAULTLINE NOCINBOX / NEW MESSAGE
03 · Powerful, flexible grading

Two methods.
One result.

Configure it your way. Get credit for getting the network right. The grader evaluates the outcome, not a single prescribed command sequence.

LIVE OUTCOME CHECK / OSPF-0147two methods / one live check
A
Engineer Ainterface-based method
Method A
R1(config)# interface GigabitEthernet0/1
R1(config-if)# ip ospf 1 area 0
R1(config-if)# no shutdown
R1(config-if)# end

! target: live adjacency and reachability
B
Engineer Bnetwork-statement method
Method B
R2(config)# router ospf 1
R2(config-router)# network 10.0.12.0 0.0.0.3 area 0
R2(config-router)# end

! target: live adjacency and reachability
Ready to checkGrade both to see whether either method actually brings OSPF up.
state pendingroute pendingdelivery pending
Dual terminal workspace

Keep both devices in view.

Work across the topology without losing context. Two live terminals make the link between the devices part of the investigation.

LIVE SESSIONtwo devices / split view active
LAB OSPF-0147
R1
R1# show ip ospf neighbor
Neighbor ID     State      Interface
2.2.2.2         FULL       Gi0/1

R1# show ip route ospf
O 10.0.2.0/24 [110/2]
  via 10.0.12.2, Gi0/1
R2
R2# show ip interface brief
Interface        Status    Protocol
Gi0/1            up        up

R2# ping 10.0.1.10 repeat 2
!!
Success rate is 100 percent (2/2)
Live evidence updates as the network convergesFULL / route installed / 2 of 2 replies
Your next shift starts here

Stop memorising commands.
Start restoring networks.

Take a ticket, open the topology, and prove the fix with the network itself.