- What NRS I Actually Is
- Who Issues It and What It Proves
- The 4A0-100 Exam: Format and Mechanics
- The Six Modules Candidates Must Master
- Hands-On Skills: SR OS and MD-CLI
- Who Benefits From This Credential
- Sequencing Your Preparation Around the Modules
- The 2027 Exam Revision: Plan Around It
- Frequently Asked Questions
- NRS I here means Nokia Network Routing Specialist I, an entry-level Nokia IP networking certification.
- It is earned by passing one mandatory exam: 4A0-100 IP Networks and Services Fundamentals.
- The exam has 40 multiple-choice questions and a 90-minute limit; the exam fee is USD 125.
- Six issuer-designated modules outline preparation, from Ethernet and IPv4 to OSPF, BGP, MPLS and VPN services.
What NRS I Actually Is
NRS I stands for Nokia Network Routing Specialist I. It is Nokia's foundational certification in IP networking and services, built around the company's service router portfolio. If you have seen the abbreviation elsewhere, be careful: several unrelated credentials in other industries share the same letters. Everything in this article refers only to the Nokia routing certification.
The credential validates that you understand how modern IP networks work and how Nokia routers fit into them. That means layered protocol models, Ethernet switching concepts, IPv4 addressing and forwarding, basic routing protocols, and an introduction to the VPN services that service providers sell. It also includes practical familiarity with the Nokia service router command line.
If you are looking for a quick definition-style answer to terms like what NRS I stands for or what the NRS I certification involves, this article gives the overview, and the linked pieces go deeper on individual angles.
Who Issues It and What It Proves
The governing body is Nokia, which designs the training, publishes the exam, and issues the certification. Nokia's published materials position NRS I as the entry point of its routing certification path. It signals that you can explain core networking concepts in the vocabulary Nokia uses and that you understand where its router products sit in a network.
It is worth being precise about what the certification does and does not claim. NRS I is a knowledge credential built on a single multiple-choice exam. It is not a lab-based assessment, and you should not assume the hands-on or composite requirements of higher Nokia credentials apply to it. The certification page for NRS I names the 4A0-100 exam as the requirement, and that is the one to prepare for. For a fuller breakdown of eligibility questions, see the guide to NRS I requirements.
The 4A0-100 Exam: Format and Mechanics
NRS I uses a single mandatory exam, 4A0-100 IP Networks and Services Fundamentals. The essentials:
| Item | Detail |
|---|---|
| Exam code and title | 4A0-100 IP Networks and Services Fundamentals |
| Question format | Multiple choice |
| Number of questions | 40 |
| Exam duration | 90 minutes |
| Appointment length | 110 minutes, including a 20-minute introductory survey |
| Published exam fee | USD 125 |
| Mandatory exam prerequisite | None listed |
Two details trip people up. First, the 110-minute appointment is not your testing time. The 20-minute introductory survey is part of the appointment, but the examination itself is 90 minutes. Second, the USD 125 figure is the exam fee only. Training courses are priced separately, and course purchase price should not be confused with what you pay to sit the exam. For a complete cost picture, read the NRS I certification cost breakdown.
With 40 questions in 90 minutes, pacing is comfortable on paper, but multiple-choice networking questions often hinge on a single qualifier such as which layer, which address type, or which behavior of a switch versus a hub. Reading carefully matters more than moving fast.
What is not published
No current pass threshold, scored versus unscored question split, or pass rate has been established in the sources reviewed for this article. You will see confident numbers circulating on forums and third-party sites. Treat them skeptically. If you want to understand how to think about this uncertainty, the discussions of the NRS I passing score and the NRS I pass rate cover what can and cannot be said. The practical response is to aim for command of all six modules rather than to target a minimum.
The Six Modules Candidates Must Master
Nokia's exam page directs candidates to the course objectives and modules. Six modules, containing 28 subtopics, form the issuer-designated preparation outline. They are unweighted: Nokia does not publish percentages for them, and they are not an exhaustive blueprint of everything that could appear. Treat them as the map, not a guarantee of coverage. The complete guide to the six NRS I content areas expands on each one.
Domain 1: Introduction to Networking and Services
This is the conceptual foundation. You need to be fluent in how layered models describe network communication and what happens to traffic as it moves through those layers.
- Protocol-layer models
- Encapsulating and decapsulating traffic
- Separating control from forwarding
Domain 2: Service Router Components and Command Line Interface
The most Nokia-specific module. It introduces the product range and the operating environment you will use throughout the Nokia routing path.
- Service-router product range
- 7750 SR hardware
- Router boot sequence
- Operating and configuring SR OS
Domain 3: Ethernet
Ethernet questions reward precise understanding of how frames move at the link layer and why designs behave the way they do.
- Access to shared media
- Hub versus switch behavior
- Link-layer addressing
- VLAN segmentation
- Redundant Ethernet
- Frame structure
Domain 4: The Internet Layer
This module is typically where calculation skills matter. Addressing and subnetting underpin everything that follows.
- IPv4 addressing
- Subnetting and summarizing routes
- 7750 SR Layer 3 interfaces
- Forwarding decisions
- Packet-header fields
- Residential and small-business connectivity
Domain 5: IP Routing Protocol Basics
Here you move from how a single router forwards a packet to how routers learn where to send it.
- Static route configuration
- OSPF fundamentals
- BGP introduction
- Internet building blocks
Domain 6: Services Overview
The capstone module connects routing fundamentals to the services providers actually deliver over their networks.
- VPN concepts
- MPLS tunnel transport
- Distributing labels with LDP
- Elements of a VPN service
- VPWS, VPLS and VPRN configuration
What the learning objectives add
Beyond the module list, Nokia's learning objectives describe what you should be able to do: explain layered TCP/IP, Ethernet, IP forwarding and addressing, the difference between static and dynamic routing, OSPF and BGP, VPN types and MPLS transport; place Nokia router products in networks; and use the 7750 SR CLI to configure service components. Those verbs matter. "Explain" and "place" point toward conceptual questions, while "configure" signals that you should know what service configuration looks like even though the exam is multiple choice.
Hands-On Skills: SR OS and MD-CLI
The current course uses the model-driven CLI, known as MD-CLI, in SR OS. That is a useful detail when choosing study material. Older tutorials and community posts may show the classic CLI, and the syntax and navigation differ between the two. If you pair outdated command examples with the current course, you can end up memorizing structures that no longer match what you are taught.
You do not need a physical router to learn the concepts, but familiarity with how SR OS is organized, how configuration is entered, and how a service router starts up will make Domain 2 questions far more intuitive. The course length and purchase price are training facts, not exam facts, so check Nokia's course page for current specifics. For options on structured preparation, see the overview of NRS I training.
Who Benefits From This Credential
NRS I fits people who need a structured, vendor-aligned grounding in IP networking and services. Typical profiles include:
- Early-career network engineers and technicians who work with, or expect to work with, Nokia service routers.
- Telecom and service-provider staff in operations, provisioning or support roles who need to understand VPN and MPLS-based services.
- Career changers and students building a foundation before pursuing higher Nokia routing credentials.
- Sales engineers and technical account staff who must discuss Nokia IP products credibly with customers.
The employers most likely to value it are those in Nokia's ecosystem: service providers and carriers running Nokia IP/MPLS infrastructure, system integrators and managed-service firms supporting them, and Nokia partners. I cannot give you reliable salary figures for NRS I specifically, and you should be wary of anyone who does without citing a source. The NRS I salary guide, the NRS I jobs overview, and the analysis of whether the certification is worth it discuss earning potential and career value in qualitative terms.
Key Takeaway
NRS I carries the most weight where Nokia IP infrastructure is actually deployed. If your target employers run other vendors' equipment, weigh the vendor-neutral value of the concepts against the vendor-specific value of the credential before paying for the exam.
Sequencing Your Preparation Around the Modules
You do not need an elaborate method. The module order Nokia uses is already a sensible learning sequence because each module depends on the one before it. A schedule that respects those dependencies looks like this:
Concepts and the router itself
- Work through layered models and encapsulation until you can narrate a packet's journey.
- Learn the 7750 SR product range, boot sequence and basic SR OS navigation.
Ethernet and IPv4
- Cover hub versus switch behavior, link-layer addressing, VLANs and frame structure.
- Drill subnetting and route summarization until it is automatic; this skill compounds in later weeks.
Routing and services
- Study static routes, OSPF and BGP introductions, then connect them to VPN concepts.
- Learn how MPLS transport, LDP label distribution and VPWS, VPLS and VPRN relate to one another.
The reason Ethernet and addressing come before routing is practical: questions about forwarding decisions assume you already understand frames, addresses and subnets. Domain 6 comes last because VPN service questions assume you understand how routers forward traffic and exchange routing information. The detailed approach is laid out in the NRS I study guide, and a compact recap lives in the NRS I cheat sheet.
When you want to test yourself, use the NRS I practice tests as supplemental study material. They are original practice content, not actual exam questions, and they do not guarantee any result. They are most useful for finding which of the six modules is weakest, so you can return to the course material with a specific target. If you are weighing how demanding the exam is before committing, this difficulty breakdown helps calibrate expectations.
The 2027 Exam Revision: Plan Around It
Nokia has announced a revised version of this exam. The announced dates are:
- The exam becomes unavailable from 2027-02-09 through 2027-03-08.
- The revised exam is announced for 2027-03-09.
This article reflects the scope as reviewed in October 2026. If your plan puts your exam date anywhere near that window, recheck Nokia's exam page before you invest in study materials or book a slot, because module content and emphasis can change in a revision. The practical advice is simple: if you are ready to test well before February 2027, schedule with the current scope in mind. If your timeline runs later, wait for the revised exam details instead of studying against an outline that is about to be retired. More on timing and scheduling is in the NRS I exam dates guide.
Frequently Asked Questions
In this context it stands for Nokia Network Routing Specialist I, the entry-level certification in Nokia's routing path. Other, unrelated credentials use the same abbreviation, so confirm you are looking at Nokia's program.
One. NRS I requires the single mandatory 4A0-100 IP Networks and Services Fundamentals exam. It is a multiple-choice test with 40 questions and a 90-minute limit.
The published exam fee is USD 125. Training courses are priced separately, so your total spend depends on whether you purchase Nokia's course or prepare with other materials.
No mandatory exam prerequisite is listed. That said, comfort with basic networking terms will make the six modules, especially subnetting and routing protocols, much easier to absorb.
No. They are unweighted, issuer-designated preparation modules containing 28 subtopics. Nokia directs candidates to the course objectives, and the list is not an exhaustive blueprint, so prepare broadly across all six.
NRS I is a focused, single-exam credential with a clearly defined preparation outline, which makes it approachable if you work through the six modules in order and confirm the current exam details with Nokia before you book.