- The Short Answer: What the Code Actually Represents
- Decoding the Number and the Nokia Heritage
- What "Quality of Service" Means on This Exam
- The Five Preparation Modules, Named
- Exam Format and Registration Mechanics
- How 4A0-107 Fits the Service Routing Architect Path
- Who Hires for This Skill Set
- Sequencing Your Preparation Around the Five Modules
- Common Confusions About the Name
- Frequently Asked Questions
- 4A0-107 is the Nokia (formerly Alcatel-Lucent) Quality of Service written exam, delivered through Pearson VUE.
- The exam has 40 multiple-choice questions and 90 minutes of testing inside a 110-minute appointment.
- Nokia's public curriculum lists five modules, from Introduction to QoS through Marking and Remarking.
- Passing 4A0-107 earns Service Routing Architect (SRA) credit but does not award SRA by itself.
The Short Answer: What the Code Actually Represents
Here is the direct answer: 4A0-107 is the exam code for the Nokia Quality of Service written exam, part of Nokia's Service Routing Certification (SRC) program. The "QoS" in the title is the subject: how an IP/MPLS service router classifies, queues, polices, schedules and marks traffic so that different applications receive different treatment under congestion.
Unlike an acronym that spells out words, "4A0-107" is an identifier. It does not abbreviate a phrase. It tells you which Nokia exam you are registering for, much as a course number identifies a class in a university catalog. If you want the broader framing of what this credential is, see our overview What Is 4A0-107? and the companion piece 4A0-107 Meaning.
Decoding the Number and the Nokia Heritage
The "4A0" prefix comes from the Alcatel-Lucent era of the Service Routing Certification program. Alcatel-Lucent built the SRC program around its service router platform, and Nokia continued and expanded it after acquiring Alcatel-Lucent's networking business. That is why you will see both names attached to this exam in older study material, forum threads and job postings. The current issuer title is Nokia Quality of Service, and the exact exam is 4A0-107.
Inside Nokia's catalog, the numeric part distinguishes this exam from sibling written exams in the same program. A neighboring exam, 4A0-104, covers a different subject and is the subject of its own comparison discussion. Nokia's program update dated September 8, 2026 states that 4A0-104's last testing day is February 8, 2027, while 4A0-107 is retained. We do not infer any retirement date for 4A0-107 beyond what Nokia has published.
For a deeper look at how the name is used in conversation and job postings, our articles on What Does 4A0-107 Mean? and What Is 4A0-107 Certification? cover the same ground from other angles.
What "Quality of Service" Means on This Exam
On a service router, Quality of Service is not an abstract concept. It is a set of concrete mechanisms configured on ingress and egress, and the exam expects you to reason about how they interact. Nokia's current course cases and labs use MD-CLI, so candidates should be comfortable reading and thinking in that configuration model, even though the written exam itself is multiple choice.
At a high level, a packet entering a router passes through a pipeline:
- Classification decides which forwarding class and priority the packet belongs to.
- Queueing and policing decide how much bandwidth it may use and what happens when it exceeds a rate.
- Hierarchical scheduling decides how bandwidth is shared among queues, subscribers or services.
- Marking and remarking decide what QoS values the packet carries as it leaves the router.
Every one of those stages maps to a module in Nokia's public curriculum, which is why the exam title and the course structure line up so closely.
The Five Preparation Modules, Named
Nokia's public Quality of Service course (3FL30639AAAAZZZZA) lists five headings, and Nokia's exact exam page points candidates to that course's objectives and modules. These five are unweighted preparation modules. They do not establish exhaustive exam coverage, official percentage allocations or an official domain count, so treat them as a map of the territory rather than a scoring blueprint. For a module-by-module walkthrough, see 4A0-107 Exam Domains 2026: Complete Guide to All 5 Content Areas.
1. Introduction to QoS
The foundation: why QoS exists and how it is structured on a service router.
- The purpose of differentiated treatment under congestion
- Where QoS is applied in the forwarding path (ingress versus egress)
- Vocabulary you will need for every later module
2. Traffic Classification
How the router decides what a packet is and what treatment it earns.
- Mapping incoming traffic to forwarding classes and priorities
- Match criteria and how classification policies are applied
- How classification decisions drive everything downstream
3. Queues and Policers
The core buffering and rate-control tools.
- Queue parameters and how they shape delay and loss
- Policing versus queueing: what each does to excess traffic
- Rate and burst concepts you must reason about, not just recite
4. Hierarchical Bandwidth Allocation
How bandwidth is shared across levels when many queues compete.
- Scheduler hierarchies and how tiers divide capacity
- Priority and weighted sharing among competing queues
- Predicting which traffic gets served when a link is oversubscribed
5. Marking and Remarking
What the packet carries when it leaves, and who trusts it.
- Setting and rewriting QoS markings at the network edge and core
- Preserving or translating treatment between domains
- Consistency between classification on one hop and marking on the previous one
Exam Format and Registration Mechanics
The written exam is delivered by Pearson VUE, either proctored online or at a test center. The facts below come from Nokia's published program details.
| Item | 4A0-107 Detail |
|---|---|
| Delivery | Pearson VUE, proctored online or at test centers |
| Fee | USD 125 |
| Questions | 40 multiple-choice written questions |
| Language | English |
| Testing time | 90 minutes |
| Appointment length | 110 minutes, including a 20-minute introductory survey |
| Prerequisites | None mandatory; training is optional |
| Retakes | No mandatory waiting period or attempt limit for the written exam |
Two details trip people up. First, the 110-minute appointment is not 110 minutes of testing: 20 minutes go to the introductory survey, leaving 90 for the questions. Second, "no mandatory prerequisites" does not mean no preparation guidance. The course has its own recommended background, but that is separate from exam eligibility. Our 4A0-107 Requirements 2026 article separates those two ideas in detail, and 4A0-107 Certification Cost 2026 breaks down the fee alongside optional training spend.
About the passing score: no official passing percentage or pass-rate statistic was verified in the public sources we reviewed. We will not quote one. Our pages on the 4A0-107 passing score and 4A0-107 pass rate explain what is and is not publicly known.
Scheduling questions, including how testing windows interact with Nokia's program changes, are covered in 4A0-107 Exam Dates 2026.
How 4A0-107 Fits the Service Routing Architect Path
This exam earns Service Routing Architect (SRA) credit, but passing it alone does not award SRA. SRA is a composite credential: it combines a set of written exams with a separate hands-on practical lab. The seven-hour SRA practical lab and the four-day preparation course are different activities from the 90-minute written exam, and candidates sometimes blur the three together.
Nokia's September 8, 2026 program update reduces the SRA written requirements from eight exams to five, and it retains 4A0-107 within that structure. The practical lab is unchanged. In practical terms, that makes 4A0-107 one of the surviving building blocks of the architect track.
On credential maintenance: SRC certifications are valid for three years, with recertification available before termination six months after expiry. 4A0-107 is an accepted renewal option for NRS I, NRS II and SRA. These are credential-maintenance rules for the certifications, not a separately established expiry date for the exam credit itself, so avoid describing the exam as "expiring in three years."
Key Takeaway
Think of 4A0-107 as one required piece of a larger credential, not a standalone certificate. If your goal is SRA, plan the written exams and the practical lab as separate projects with separate preparation.
Who Hires for This Skill Set
The skills tested here are service provider skills. Employers that value Nokia QoS knowledge are the ones that operate or support IP/MPLS service routing networks:
- Telecom and service providers running Nokia service routers in their backbone and edge, where voice, video and enterprise VPN traffic must coexist.
- Managed network and systems integration firms that design and deploy networks for carrier and large enterprise customers.
- Nokia partners and support organizations that need engineers who can troubleshoot congestion, queue drops and misclassification.
- Large enterprises and cloud or data center operators with carrier-grade WAN and transport requirements.
Typical roles include network engineer, IP/MPLS engineer, network designer, pre-sales or solutions architect, and operations or escalation engineer. The exam signals that you understand traffic treatment, a skill that matters most when networks are loaded or something has gone wrong. We keep a separate look at 4A0-107 jobs and a financial view in the 4A0-107 salary guide; for the cost-benefit question, read Is the 4A0-107 Certification Worth It?. We deliberately avoid quoting salary figures here because none were verified for this specific exam.
Sequencing Your Preparation Around the Five Modules
Study method is the least interesting part of this exam, but order is not. Because the modules build on one another, a sensible plan follows the packet pipeline rather than jumping to the hardest topic first. One possible five-week layout:
Introduction to QoS and Traffic Classification
- Learn the vocabulary and where QoS applies in the forwarding path
- Work through how classification assigns forwarding class and priority
Queues and Policers
- Compare queueing and policing behavior on excess traffic
- Practice predicting outcomes from rate and burst settings
Hierarchical Bandwidth Allocation
- Trace how capacity is divided across scheduler tiers
- Reason through oversubscription scenarios
Marking and Remarking
- Connect marking decisions back to classification at the next hop
- Review end-to-end treatment across domains
Integration and practice questions
- Take timed sets of 40 questions in 90 minutes
- Revisit the module where your reasoning breaks down most often
Nokia links a public practice document, Practice Exam Questions for Nokia Quality of Service (4A0-107), copyright 2024, document code (June) CID202017. It is worth reading to see question style, though it is not a substitute for understanding the modules. For a fuller plan, see the 4A0-107 Study Guide 2026, and for a condensed refresher the 4A0-107 Cheat Sheet. If you want structured drill, our 4A0-107 practice tests are built around the same five areas, and you can judge your readiness against the format described in How Hard Is the 4A0-107 Exam?.
If you also want instructor-led material, see our notes on 4A0-107 training. Remember that training is optional for the exam.
Common Confusions About the Name
"4A0-107" is not a version number
The suffix is not a release or revision. It does not mean the 107th version of anything, and it does not indicate difficulty level.
The exam is not the course, and not the lab
The four-day course teaches the material. The 90-minute exam tests it with multiple-choice questions. The seven-hour SRA practical lab is a hands-on assessment for a different credential step. Three activities, three purposes.
The exam is not a stand-alone architect credential
Because it earns SRA credit rather than awarding SRA, a passing result is best described as "credit toward SRA," not "I am an SRA."
Similar codes belong to other programs
If you encounter a source describing a different vendor, a different fee structure or a different subject under a nearly identical code, that is a different credential. For a quick comparison of how people phrase this question, see What Is A 4A0-107? and our general 4A0-107 Certification page. This article is also the canonical home for the question in its title, alongside the near-duplicate What Does 4A0-107 Stand For? listing.
Frequently Asked Questions
It does not spell out words. 4A0-107 is the identifier for the Nokia (formerly Alcatel-Lucent) Quality of Service written exam in the Service Routing Certification program.
Both names appear because Alcatel-Lucent created the program and Nokia continued it. The current issuer title is Nokia Quality of Service, exact exam 4A0-107.
There are 40 multiple-choice questions in English and 90 minutes of testing. The appointment runs 110 minutes because it includes a 20-minute introductory survey.
No. The exam earns SRA credit, but SRA also involves other written requirements and a separate seven-hour practical lab. Passing 4A0-107 alone does not award SRA.
Nokia lists no mandatory waiting period or attempt limit for the written exam retake. Each attempt still requires registering through Pearson VUE and paying the USD 125 fee again.