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Nokia SR OS NRS I practice labs

14 guided labs on virtual SR-1s routers running SR OS 21.10, for Nokia’s NRS I exam (4A0-100). Work in the classic CLI and MD-CLI, set up ports and the system address, run static routes with BFD, OSPF, IS-IS and BGP, build MPLS with LDP and RSVP-TE, deliver Epipe, VPLS, VPRN and IES services, then fix planted faults in two troubleshooting labs and build a provider network in a capstone.

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Standard for a month, £75.00, runs every lab here, with nothing extra to pay for the guided labs. 1 of the 14 labs also run in the free demo.

Guided labs
14
Follows
Nokia NRS I (4A0-100)
Runs every lab
Standard
Devices
Integrated router and Alpine Linux

Who these labs are for

For engineers preparing for Nokia’s Network Routing Specialist I exam, and engineers moving to SR OS from another vendor. You should already know basic IP routing.

The routers’ clocks start in 2021, so log dates look old: don’t set the date or use NTP. Forwarding is simulated, not real hardware. Nokia says NRS I changes on 9 March 2027, and that content isn’t published yet, so these labs aren’t written against it.

The 14 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.

Nokia SR OS course 14 labs

Shared folderNokia SR OS NRS I guided labs

From the CLI through routing and MPLS to all four service types, then two troubleshooting labs and a capstone.

  1. 01SR OS CLI classic and MD-CLI

    Get around both SR OS command lines on a bench router: name it, save it, add a user, open the MD-CLI and commit a change with it.

    1× Integrated router

    2 vCPU, 4,800 MBFits LiteRuns in the free demo

  2. 02Ports interfaces and the system address

    Bring two new routers into service: provision the card and MDA, split connectors into ports, bind IP interfaces, set the system address and run VLANs on a dot1q port.

    2× Integrated router

    4 vCPU, 9,600 MBFits Standard

  3. 03Static routes floating backups and BFD

    Join two sites with static routes, add a floating backup, use BFD to notice a failure the port can't see, and finish with a black-hole route and ECMP.

    2× Alpine Linux, 2× Integrated router

    6 vCPU, 10,624 MBFits Standard

  4. 04OSPF areas and export policy

    Build OSPF across three routers: area 0 and area 1, point-to-point links, an external route brought in with an export policy, and a stub area.

    3× Integrated router

    6 vCPU, 14,400 MBFits Standard

  5. 05IS-IS levels and route leaking

    Build a two-level IS-IS network across three routers, follow the attached default route, turn on wide metrics and leak one prefix from level 2 into level 1.

    3× Integrated router

    6 vCPU, 14,400 MBFits Standard

  6. 06BGP - iBGP eBGP and policy

    Connect Rivermark to an upstream: iBGP on system addresses, eBGP on link addresses, routes announced by export policy, next-hop-self, and local preference to choose the exit.

    3× Integrated router

    6 vCPU, 14,400 MBFits Standard

  7. 07MPLS with LDP

    Turn on LDP across a three-router core, read the sessions, bindings and tunnel table, and prove an LSP with lsp-ping and lsp-trace.

    3× Integrated router

    6 vCPU, 14,400 MBFits Standard

  8. 08RSVP-TE paths and protection

    Steer an LSP along an explicit path with RSVP-TE, add a standby secondary and fast reroute, and fail the primary to see protection work.

    3× Integrated router

    6 vCPU, 14,400 MBFits Standard

  9. 09Epipe - VPWS

    Join two customer sites with a point-to-point Layer 2 service: access ports, a customer, an SDP over LDP, an Epipe, and OAM tests of each layer.

    2× Alpine Linux, 2× Integrated router

    6 vCPU, 10,624 MBFits Standard

  10. 10VPLS

    Join three sites into one Ethernet LAN: a full mesh of SDPs, a VPLS with mesh bindings, MAC learning in the FDB, and a table limit.

    3× Alpine Linux, 3× Integrated router

    9 vCPU, 15,936 MBFits Standard

  11. 11VPRN and IES

    Build two Layer 3 VPNs with the same addresses over MP-BGP and LDP, then give a third customer a routed IES in the global table.

    5× Alpine Linux, 2× Integrated router

    9 vCPU, 12,160 MBFits Standard

  12. 12Troubleshooting the core

    Four faults from a bad maintenance night: find and fix them from the bottom up, through OSPF, LDP and RSVP-TE.

    3× Integrated router

    6 vCPU, 14,400 MBFits Standard

  13. 13Troubleshooting services

    Two customers down: find five provisioning faults in an Epipe and a VPRN, using service flags, OAM and BGP output.

    4× Alpine Linux, 2× Integrated router

    8 vCPU, 11,648 MBFits Standard

  14. 14Capstone provider network build

    Build a three-router provider network from the ports up: IS-IS, LDP, MP-BGP, SDPs, and then an Epipe, a VPLS, a VPRN and an IES for three customers.

    3× Alpine Linux, 3× Integrated router

    9 vCPU, 15,936 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 Nokia SR OS NRS I practice labs, as read on 2 November 2026
DeviceImage in Add NodeSet toLabsNodes
Nokia Integrated router (VSR NG template)timos-ng-21.10.R12 vCPU, 4,800 MB1435
Alpine Linuxclbalpinebase-alpine-base-3-20-31 vCPU, 512 MB619

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 Nokia SR OS NRS I 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 Nokia SR OS NRS I labs

Are these Nokia SR OS NRS I 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 1 of these labs.

Which plan do I need for these labs?

Standard, with 12 vCPU and 16 GB, runs every lab here. Lite runs 1 of the 14. 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, “VPLS”, needs 9 vCPU and 15,936 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 Nokia?

No. CloudLabBox wrote them to follow the topics of Nokia’s Network Routing Specialist I exam (4A0-100), on SR OS 21.10. They aren’t training material from Nokia, and CloudLabBox is independent of Nokia.

Which plan do I need?

Lab 01 fits Lite. The other 13 need Standard, because each router takes 2 vCPU and 4,800 MB.

Do the labs teach classic CLI or MD-CLI?

Both. Labs 01 to 11 each include work in the MD-CLI. The troubleshooting labs and the capstone use the classic CLI.

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 1 of these labs. No card and no email.

Try it free for 30 minutesStart this course

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

More practice labs

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