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JNCIA-Junos practice labs

15 guided labs that take you from a factory-default Junos router to a working multi-router network: the CLI and commit model, interfaces, users and login classes, management services, static routing, OSPF, routing instances, routing policy, firewall filters, maintenance and troubleshooting. They run on Juniper vJunos-router.

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Standard for a month, £75.00, runs every lab here, with nothing extra to pay for the guided labs. 6 of the 15 labs also run in the free demo.

Guided labs
15
Follows
Juniper JNCIA-Junos (JN0-106)
Runs every lab
Standard
Devices
vJunos-router

Who these labs are for

For engineers and students preparing for Juniper’s JNCIA-Junos (JN0-106), and Cisco-trained engineers who need to work confidently on Junos. The labs cover every objective of the exam.

Each lab starts from its own saved state, and its solution is written in Junos set commands. vJunos-router nodes are set to 4 vCPU each, so the bigger labs need Standard: the plan card shows which.

The 15 labs

Every lab in the folder, as the workspace lists them, with what each runs and the smallest plan that fits. Read on 2 November 2026.

JNCIA-Junos course 15 labs

Shared folderJNCIA-Junos JN0-106 guided labs

One Junos topic per lab, ending in a troubleshooting lab and a troubleshooting capstone that start broken.

  1. 01First boot - from factory default to a managed router

    Log in to a brand-new Junos router, explore what the factory configuration contains, and give it the minimum configuration every device needs before it goes on a network: a root password of your choosing, a name, an admin account, SSH and its first interface addresses.

    1× vJunos-router

    4 vCPU, 5,120 MBFits LiteRuns in the free demo

  2. 02Working fast in the Junos CLI

    Work fast and accurately in the Junos CLI: find any command with the help system, filter long output with pipes, move around the configuration hierarchy, and use copy, rename, deactivate and annotate to edit like an experienced engineer.

    1× vJunos-router

    4 vCPU, 5,120 MBFits LiteRuns in the free demo

  3. 03The commit model with rollback and rescue

    Master the Junos commit model that makes Junos safe to change: compare before you commit, use commit confirmed as a safety net, roll back a bad change in seconds, save and load configuration files, and keep a rescue configuration for emergencies.

    1× vJunos-router

    4 vCPU, 5,120 MBFits LiteRuns in the free demo

  4. 04Interfaces and logical units

    Connect HQ to the new depot over two links: a plain routed link with IPv4 and IPv6, and a VLAN-tagged link that carries two logical interfaces. Along the way you read interface names, check ARP and IPv6 neighbours, find the real MTU, disable a port and read the error counters.

    2× vJunos-router

    8 vCPU, 10,240 MBFits Standard

  5. 05User accounts and login classes

    Give three teams the access they need and nothing more: a read-only help desk, a NOC that can look and ping, and network operators who can change interfaces but never the loopback. Then add an SSH key, put RADIUS in front of the local accounts and lock down repeated login failures.

    1× vJunos-router

    4 vCPU, 5,120 MBFits LiteRuns in the free demo

  6. 06Configuration groups and management services

    Standardise two routers with a configuration group, point them at the company time and DNS servers, make them manageable by SNMP, and have HQ copy its configuration to DEPOT automatically on every commit. Finish with what J-Web offers and how to switch it on.

    2× vJunos-router

    8 vCPU, 10,240 MBFits Standard

  7. 07Static routing

    Join three sites with static routes. You read the routing table, route a summary and a more specific prefix to different places, add a floating backup route that takes over when the main link is cut, compare discard and reject, route IPv6, and see how the routing table becomes the forwarding table.

    3× vJunos-router

    12 vCPU, 15,360 MBFits Standard

  8. 08Dynamic routing with OSPF and OSPFv3

    Replace the hand-built static routes with OSPF. You bring up adjacencies, read the link-state database, see why the old static routes still win, tune link costs to steer traffic, add IPv6 with OSPFv3, and watch OSPF route around a failure that static routing could not see.

    3× vJunos-router

    12 vCPU, 15,360 MBFits Standard

  9. 09Routing instances

    Split one router into three: the corporate network, a guest Wi-Fi network that may reach HQ through a controlled link, and a CCTV network that must stay completely isolated even though it uses the same addresses as the guests.

    1× vJunos-router

    4 vCPU, 5,120 MBFits LiteRuns in the free demo

  10. 10Routing policy and route filters

    Control exactly which routes OSPF advertises and installs. You see what the default policies do, export the depot's customer routes with a precise route filter, keep the guest network private, chain policies, and stop HQ installing a partner network while it stays in the OSPF database.

    3× vJunos-router

    12 vCPU, 15,360 MBFits Standard

  11. 11Firewall filters and unicast RPF

    Protect HQ's routing engine with a loopback filter, rate-limit ICMP with a policer, block selected transit traffic between the depot and the warehouse, and switch on unicast reverse-path forwarding, first strict, then loose when asymmetric routing makes strict mode drop good traffic.

    3× vJunos-router

    12 vCPU, 15,360 MBFits Standard

  12. 12System logging and monitoring tools

    Give two routers a proper logging set-up, cause a real OSPF failure and read it in the logs, trace OSPF hellos as they happen, watch interfaces and packets live, and use ping, traceroute, SSH and telnet from the Junos CLI like a support engineer.

    2× vJunos-router

    8 vCPU, 10,240 MBFits Standard

  13. 13Maintenance and root password recovery

    Look inside a Junos router (Routing Engine, Packet Forwarding Engine and the daemons that run them), check storage before an upgrade, walk through the upgrade procedure, schedule and cancel a reboot, and recover a forgotten root password from the boot menu.

    1× vJunos-router

    4 vCPU, 5,120 MBFits LiteRuns in the free demo

  14. 14Troubleshooting interfaces and static routes

    A contractor rebuilt the three-site static network overnight and left it broken in six places. Work from five user complaints to the faults, layer by layer, using only show commands and ping, and fix each one without breaking anything else.

    3× vJunos-router

    12 vCPU, 15,360 MBFits Standard

  15. 15Capstone troubleshooting

    The final exam for the course: a three-router OSPF network with routing policy and a loopback filter, broken in six places that hide behind each other. Restore the design from four trouble tickets using everything you have learned.

    3× vJunos-router

    12 vCPU, 15,360 MBFits Standard

Devices and images

The exact Add Node images the labs use, and the vCPU and RAM their nodes are set to. Your plan counts what each running node is set to.

Devices and images in the JNCIA-Junos practice labs, as read on 2 November 2026
DeviceImage in Add NodeSet toLabsNodes
Juniper vJunos-routervjunosrouter-24.2R1-S2.54 vCPU, 5,120 MB1530

Browse every image in the Add Node list

How to open the labs

  1. Sign in to your workspace at lab.cloudlabbox.com.

  2. In File Manager, open Shared, then the folder JNCIA-Junos JN0-106 guided labs.

  3. Open a lab and start its nodes, then open Lab Tasks for the steps.

The labs are read-only. You can start the nodes and configure the devices, but changes to the topology can’t be saved. To change a lab, rebuild it in your own folder.

The Shared folder in the EVE-NG File Manager, recorded on 2 November 2026 with a test account.
The EVE-NG File Manager open on the read-only Shared folder: one folder per guided course, including Arista EOS, BGP in depth, CCIE Enterprise Infrastructure, CCNA, CCNP ENARSI and ENCOR, Check Point, Cisco ASA, Cisco Nexus NX-OS, CompTIA Network Plus and FortiGate
A guided CCNA lab with its Lab Tasks pane, recorded on 1 November 2026 with a test account.
A guided CCNA lab open in EVE-NG with its nodes running: four routers and two PCs on the canvas, and the Lab Tasks pane beside them with the scenario, the addressing plan and the first task

Questions about the JNCIA-Junos labs

Are these JNCIA-Junos labs free?

They’re included with every lab plan, with nothing extra to pay, rather than free. Plans start at £3 a day or £0.50 an hour. To try one first, the free demo gives you 30 minutes with 6 vCPU and 8 GB, enough to run 6 of these labs.

Which plan do I need for these labs?

Standard, with 12 vCPU and 16 GB, runs every lab here. Lite runs 6 of the 15. EVE-NG admits a node by the vCPU and RAM configured on it, so a lab needs the total its running nodes are set to. The biggest here, “Static routing”, needs 12 vCPU and 15,360 MB. Each lab’s Lab Tasks pane names the plan it needs.

Can I change these labs?

You can start the nodes and configure the devices, but the labs are read-only: changes to the topology can’t be saved. To change one, rebuild it in your own folder.

Are these labs from Juniper Networks?

No. CloudLabBox wrote them to follow the topics of Juniper’s JNCIA-Junos exam (JN0-106). They aren’t training material from Juniper Networks, and CloudLabBox is independent of Juniper Networks.

Try a lab before you choose

The free demo is a real workspace for 30 minutes, with 6 vCPU and 8 GB: enough to run 6 of these labs. No card and no email.

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Plans from £3 a day or £0.50 an hour, each with every guided lab.

More practice labs

CloudLabBox is independent of Juniper Networks. The labs follow exam topics and aren’t vendor training material; vendor names identify the exams and the images in the workspace.