- What NRS I Training Actually Covers
- The Exam Behind the Training: 4A0-100 Facts
- Walking Through the Six Modules
- Why Hands-On CLI Time Matters
- A Module-Ordered Study Sequence
- Choosing Training Resources Wisely
- Who Gets the Most From This Training
- Checking the Exam Schedule Before You Commit
- Frequently Asked Questions
- NRS I training prepares you for one mandatory exam: 4A0-100 IP Networks and Services Fundamentals.
- The exam is 40 multiple-choice questions in 90 minutes; the appointment runs 110 minutes including a survey.
- Six unweighted modules form the preparation outline, from networking basics through VPWS, VPLS and VPRN services.
- The current course uses MD-CLI, so practice commands in that style on the 7750SR.
What NRS I Training Actually Covers
Nokia Network Routing Specialist I is the entry point of Nokia's routing certification path, and the training built around it teaches the fundamentals of IP networks and services on Nokia service routers. It is not a vendor-neutral networking survey. It starts with layered models and Ethernet, builds up through IPv4 and basic routing protocols, and finishes with an overview of VPN services carried over MPLS, all taught with the Nokia 7750 Service Router (SR) as the reference platform.
That focus shapes how you should prepare. A candidate who has only studied generic CCNA-style material will recognize much of the theory but will still need to learn Nokia's product range, SR OS conventions and the way services are configured on the router. If you are still orienting yourself, the overview in What Is NRS I Certification? explains where the credential sits, and NRS I Requirements 2026 covers eligibility in detail.
The Exam Behind the Training: 4A0-100 Facts
NRS I requires a single mandatory exam, 4A0-100 IP Networks and Services Fundamentals. There is no lab component and no second composite exam to pass for this credential. Do not confuse it with the requirements of NRS II or the Service Routing Architect track, which have their own structures and should not be assumed to apply here.
| Item | NRS I Detail |
|---|---|
| Exam code and title | 4A0-100 IP Networks and Services Fundamentals |
| 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 (training is priced separately) |
| Mandatory exam prerequisite | None listed |
| Pass threshold and pass rate | Not established in the sources reviewed |
The 110-minute appointment catches some candidates off guard. Only 90 of those minutes are the examination itself; the introductory survey fills the rest. For a fuller cost picture see NRS I Certification Cost 2026, and for what is and is not known about scoring, read NRS I Passing Score 2026 and NRS I Pass Rate 2026. Neither a current pass threshold nor a pass rate is established here, so treat any figure you see quoted elsewhere with suspicion.
Walking Through the Six Modules
The issuer organizes preparation into six modules containing 28 subtopics in total. These are issuer-designated candidate exam topics and the exam page directs candidates to the course objectives. They are not weighted domains and they are not a promise of exhaustive coverage, so do not allocate study hours by assuming equal or proportional question counts.
Introduction to Networking and Services
Domain 1: Introduction to Networking and Services
This module sets the vocabulary for everything that follows. Expect to explain how layered models organize communication and what happens to traffic as it moves through those layers.
- Protocol-layer models, including layered TCP/IP
- Encapsulating and decapsulating traffic at each layer
- Separating control from forwarding, a concept that returns in routing and services
Service Router Components and Command Line Interface
Domain 2: Service Router Components and Command Line Interface
This is where the training becomes distinctly Nokia. You place the product family in a network and learn how an SR is brought up and operated.
- The service-router product range and where each platform fits
- 7750SR hardware components
- The router boot sequence
- Operating and configuring SR OS from the command line
Ethernet
Domain 3: Ethernet
Ethernet is the link-layer foundation under almost every service you will later configure. Questions here reward precise understanding of how frames and switches behave.
- Access to shared media
- Hub versus switch behavior
- Link-layer addressing
- VLAN segmentation
- Redundant Ethernet
- Frame structure
The Internet Layer
Domain 4: The Internet Layer
This module combines pure IP theory with its Nokia implementation. Subnetting and forwarding logic are the skills most worth drilling by hand.
- IPv4 addressing
- Subnetting and summarizing routes
- 7750SR layer 3 interfaces
- Forwarding decisions and packet-header fields
- Residential and small-business connectivity
IP Routing Protocol Basics
Domain 5: IP Routing Protocol Basics
The course introduces routing as a progression, from manually configured routes to dynamic protocols, and places them in the context of the wider internet.
- Static route configuration
- OSPF fundamentals
- BGP introduction
- Internet building blocks
Services Overview
Domain 6: Services Overview
The final module explains why a service provider runs MPLS at all and how customer services ride on top of it. Tie each service type to the problem it solves.
- VPN concepts
- MPLS tunnel transport
- Distributing labels with LDP
- Elements of a VPN service
- VPWS, VPLS and VPRN configuration
For a deeper treatment of how these areas map to what you will be asked, see NRS I Exam Domains 2026: Complete Guide to All 6 Content Areas.
Why Hands-On CLI Time Matters
The learning objectives go beyond explaining concepts: candidates are expected to use the 7750SR CLI and configure service components. Even though the exam itself is multiple-choice, questions can describe a configuration or a command and ask you to identify what it does or what is wrong with it. Candidates who have typed the commands recognize these scenarios quickly; candidates who have only read about them tend to second-guess.
The current course uses the model-driven CLI (MD-CLI). That matters for two reasons. First, you should practice in the same style the training teaches rather than relying on older syntax you may find in forum posts or legacy documents. Second, MD-CLI's structured, hierarchical approach to configuration is itself part of what you are learning when you "operate and configure SR OS."
A Module-Ordered Study Sequence
Because the six modules build on each other, the most sensible schedule follows their order rather than jumping to the topics that feel most exciting. Services Overview is the module people want to start with, but VPLS and VPRN make little sense without solid Ethernet, IP and routing foundations underneath them. The timeline below is a sketch, not a mandate; compress or stretch it to match your background.
Models and the Service Router
- Draw the layered model and trace encapsulation and decapsulation by hand
- Learn the SR product range, 7750SR hardware and the boot sequence
- Begin basic MD-CLI navigation
Ethernet and the Internet Layer
- Work through hub versus switch behavior, VLANs and frame structure
- Practice IPv4 subnetting and route summarization until it is automatic
- Configure layer 3 interfaces on the 7750SR
Routing Protocol Basics
- Configure and verify static routes
- Explain OSPF fundamentals in your own words
- Describe where BGP fits among internet building blocks
Services Overview and Review
- Connect MPLS transport and LDP label distribution to VPN service elements
- Compare VPWS, VPLS and VPRN and what each delivers
- Return to weaker modules and retest
This is the only schedule-style section in this article on purpose; the module order above is what makes it NRS I-specific rather than a generic plan. For a fuller preparation roadmap, see NRS I Study Guide 2026: How to Pass on Your First Attempt, and for a compact recap of facts to revisit in your final days, NRS I Cheat Sheet 2026.
Choosing Training Resources Wisely
The issuer's own course is the authoritative source for what the exam is built around, and the exam page explicitly points candidates to the course objectives and modules. Everything else you use should be treated as supplemental. That includes the practice material on our practice test site, which is original study material written to help you rehearse concepts. It is not issuer-endorsed, it does not reproduce actual exam questions and it cannot guarantee a result.
What a good supplement does
- Reinforces a specific subtopic, such as subnet math or VLAN behavior, with immediate feedback
- Forces you to explain why a wrong option is wrong, which exposes shaky understanding
- Maps clearly to the six module names so you can see which area is dragging you down
What to be wary of
- Any resource claiming to contain "real" 4A0-100 questions
- Notes that mix in material from other credentials that share the NRS I abbreviation
- Pass-rate or score claims with no cited source
If a resource gives you a pass percentage or a cut score for this exam, remember that no current threshold, scored/unscored split or pass rate is established in the issuer sources reviewed for this article. Confidence should come from your own module-by-module readiness, not from someone else's number. To judge how demanding the exam is likely to feel, How Hard Is the NRS I Exam? offers a qualitative breakdown.
Who Gets the Most From This Training
NRS I is built for people early in a service-provider or carrier-style networking path, and for anyone who will encounter Nokia service routers in their work. Typical beneficiaries include:
- Network operations staff supporting environments that run Nokia routing platforms
- Newer engineers who want a structured grounding in IP, Ethernet and MPLS-based services
- Pre-sales and technical support roles that need to speak credibly about SR products and VPN services
- Career-changers moving from enterprise networking toward carrier and service-provider environments
Employers who run or support Nokia-based networks are the natural audience for the credential, though how much weight any employer gives it varies. If you are weighing it against your goals, Is the NRS I Certification Worth It?, NRS I Salary Guide 2026 and NRS I Jobs take up the career side. Keep in mind that this article does not quote salary figures, because no verified numbers are available to cite here.
Key Takeaway
Train in the order the modules are taught, practice every configuration topic in MD-CLI, and treat all third-party material as supplemental to the issuer's course objectives. Your readiness is best measured module by module, not by a single overall impression.
Checking the Exam Schedule Before You Commit
The issuer has announced a revised exam on 2027-03-09, with the current exam unavailable from 2027-02-09 through 2027-03-08. The scope described in this article reflects the October 2026 version of the exam and was checked against issuer pages on October 11, 2026. If your preparation will run anywhere near the transition, confirm the current exam code, modules and course content on the official pages before you spend money on a seat or build your plan around the topics above.
Working backward from the unavailability window is a practical way to set your deadline. Leave enough buffer for a reschedule in case work or illness intervenes, and read NRS I Exam Dates 2026 for scheduling mechanics. When you are ready to start rehearsing, our NRS I practice test gives you a way to check each module against original questions.
Frequently Asked Questions
One. NRS I requires the single mandatory 4A0-100 IP Networks and Services Fundamentals exam. Do not assume the lab or composite requirements of NRS II or the Service Routing Architect track apply to it.
The exam has 40 multiple-choice questions and a 90-minute duration. The scheduled appointment is 110 minutes because it includes a 20-minute introductory survey, which is not part of the examination time.
No. The six modules and their 28 subtopics are an issuer-designated preparation outline, not a weighted blueprint and not an assertion of exhaustive content. Study all six rather than guessing which carry more questions.
No. The published exam fee is USD 125, and training prices are separate. Course length and purchase price are training facts, distinct from exam time and fees. See the cost breakdown article for a combined view.
No mandatory exam prerequisite is listed. Practical familiarity with basic networking helps, but the training itself starts from foundational concepts such as protocol layers and encapsulation.