- The Pass-Rate Number Nobody Has Published
- What Nokia's Public Sources Do Establish
- Why a Pass Rate Would Mislead You Anyway
- Where Candidates Realistically Lose Points
- Retake Economics: Low-Risk, Not Free
- A Readiness Plan Built Around the Five Modules
- The 2026/27 Program Update and Your Timing
- Frequently Asked Questions
- No official 4A0-107 pass rate or passing percentage was verified in the reviewed public Nokia sources.
- The exam is 40 multiple-choice questions in 90 minutes, delivered through Pearson VUE for USD 125.
- Written-exam retakes have no mandatory waiting period or attempt limit, which lowers the cost of a failed attempt.
- The five preparation modules are unweighted, so prepare evenly rather than betting on one domain.
The Pass-Rate Number Nobody Has Published
If you searched for the 4A0-107 pass rate hoping for a tidy percentage, here is the honest answer: it has not been published in any public source we could verify. Nokia's exam page, the Quality of Service course page, the Service Routing Architect certification page and the recertification page describe format, fees and program rules. None of them states how many candidates pass, and none states the score required to pass.
That matters because many sites fill this gap with confident-sounding figures. Those numbers have no traceable origin. This article takes a different approach: it lays out what is actually documented about Nokia Quality of Service exam 4A0-107, explains what that evidence implies about difficulty, and shows how to estimate your own readiness without leaning on a statistic that does not exist.
If your real question is "how hard will this be?", our companion piece on how hard the 4A0-107 exam is works through difficulty from the curriculum side. For score mechanics, see the separate note on the 4A0-107 passing score, which covers what is and is not known about the threshold.
What Nokia's Public Sources Do Establish
Even without a pass rate, the documented facts tell you a lot about what you are walking into. Here is the verified picture of exam 4A0-107, Nokia Quality of Service.
| Attribute | Documented detail |
|---|---|
| Issuer | Nokia (formerly Alcatel-Lucent) |
| Delivery | Pearson VUE, proctored online or at a test center |
| Fee | USD 125 |
| Format | 40 multiple-choice written questions, in English |
| Testing time | 90 minutes within a 110-minute appointment |
| Appointment structure | Includes a 20-minute introductory survey |
| Prerequisites | None mandatory for the exam; training is optional |
| Retakes | No mandatory waiting period or attempt limit for the written exam |
| Passing score / pass rate | Not verified in reviewed public sources |
Two details are easy to misread. First, the 110-minute appointment is not your thinking time: 20 minutes go to the introductory survey, leaving 90 minutes for the 40 questions. That works out to roughly two minutes and fifteen seconds per question, which is generous for multiple choice but tight if several questions require you to trace a packet through a classification and queueing policy. Second, "no mandatory prerequisites" describes the exam registration rule. It does not mean the material is introductory. The four-day preparation course carries its own recommended background, which is separate guidance and a different thing from an eligibility gate. For the registration side, see our breakdown of 4A0-107 requirements.
Cost is straightforward at USD 125 per sitting. The 4A0-107 certification cost guide covers how training spend compares to the exam fee itself.
Why a Pass Rate Would Mislead You Anyway
Suppose Nokia did publish a percentage tomorrow. It would still be a weak predictor of your outcome, for reasons specific to how this exam is taken.
The candidate pool is self-selected
People who sit a Service Routing Certification exam are overwhelmingly working network engineers, often with live IP/MPLS experience and an employer paying the fee. A pass rate averaged across that pool tells you about the pool, not about a candidate with your particular gaps. A strong routing engineer who has never configured a hierarchical scheduler faces a different exam than a QoS specialist who has never touched the Nokia platform.
Retakes distort any headline figure
Because the written exam has no mandatory waiting period and no attempt limit, a published rate could count attempts rather than people. A candidate who fails twice and passes on the third try looks like two failures and one pass in attempt-based statistics, even though they ended up certified. The number would be accurate and still unhelpful.
The exam is a module of a larger path
4A0-107 earns Service Routing Architect (SRA) credit, but passing it alone does not award SRA. The separate seven-hour SRA practical lab is a different activity entirely. Candidates often treat the written exam as one step among several, which changes how much preparation they invest in it.
Where Candidates Realistically Lose Points
Nokia publishes five unweighted preparation headings for the Quality of Service course. They are not official exam domains with percentage allocations, and they do not establish exhaustive coverage, but they are the best public map of what to master. Because no weighting exists, the sensible assumption is that any module can appear, so each needs competence. For a deeper walkthrough, see the complete guide to the 4A0-107 content areas.
Introduction to QoS
The vocabulary and reasoning layer. Questions here reward precise understanding of why QoS exists and how traffic behaves under congestion.
- Distinguish bandwidth, delay, jitter and loss, and which applications tolerate which
- Explain why QoS only matters at points of congestion
- Recognize the difference between classifying, queueing, scheduling and policing as separate functions
Traffic Classification
How the router decides which forwarding class and priority a packet receives. Candidates commonly confuse ingress and egress behavior.
- Match criteria and how they map traffic into forwarding classes
- Where classification happens relative to the direction of traffic
- How trusted versus untrusted markings change outcomes
Queues and Policers
Probably the densest module for scenario questions. Expect to reason about what happens to a packet when a queue fills or a rate is exceeded.
- Queue parameters and how they shape drop and scheduling behavior
- The conceptual difference between a queue that buffers and a policer that discards or marks
- How rates and burst allowances interact
Hierarchical Bandwidth Allocation
Where individual queues roll up into scheduling tiers. Candidates who memorize definitions but never traced a multi-tier example tend to stall here.
- How bandwidth is shared across levels of a scheduling hierarchy
- What happens when higher tiers are oversubscribed or underused
- Priority treatment versus fair sharing within a tier
Marking and Remarking
Setting and changing the QoS values carried in packets so downstream devices treat traffic consistently.
- Which header fields carry QoS markings at different layers
- When and why a router rewrites a marking
- How remarking interacts with classification at the next hop
One practical observation: the current course cases and labs use MD-CLI. If your hands-on experience is with the older classic CLI, spend time reading MD-CLI syntax so configuration-based questions do not feel foreign. The written exam is multiple choice, but scenario questions often present configuration fragments and ask what behavior results.
Retake Economics: Low-Risk, Not Free
The absence of a waiting period or attempt cap changes the risk calculation. You cannot be locked out of the credential by a bad day. That is real and useful. But each attempt still costs USD 125 plus a 110-minute block of your time, and an unplanned failure delays any recertification or SRA timeline you are working against.
Key Takeaway
Do not treat unlimited retakes as a substitute for preparation. Use a failed attempt diagnostically: note which module felt weakest while the questions are fresh, then rebuild that module before booking again. Sitting the exam repeatedly without changing your study approach mostly converts fees into frustration.
A related point: 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. Those are credential-maintenance rules, not a separately established expiry on the exam credit itself, so do not read them as "the exam result expires in three years." See the 4A0-107 certification overview for how the pieces fit together.
A Readiness Plan Built Around the Five Modules
This is the one place for scheduling advice, and it is organized by what each module demands rather than by generic technique. Because the modules build on one another, order matters: classification feeds queueing, queueing feeds hierarchy, and marking ties the chain together. For a longer plan, the 4A0-107 study guide expands this into a first-attempt strategy.
Foundations and classification
- Cover Introduction to QoS and Traffic Classification together
- Draw the path a packet takes from ingress classification to egress, and label each decision point
- Take a short diagnostic practice set to find baseline gaps
Queues and policers
- Work through queue and policer parameters with worked examples
- Practice predicting outcomes: what is dropped, what is delayed, what is remarked
- Read MD-CLI configuration snippets until the syntax is automatic
Hierarchy and marking
- Trace bandwidth through a multi-tier scheduler under both congested and idle conditions
- Map marking fields across layers and rehearse remarking scenarios
- Revisit Week 2 weak spots, since hierarchy builds directly on queues
Timed integration
- Sit full 40-question sets against a 90-minute clock
- Review every miss by module, not just by question
- Book the exam only after results are consistent across all five modules
Nokia also links a public document titled Practice Exam Questions for Nokia Quality of Service (4A0-107), dated 2024 with document code CID202017. It is useful for getting a feel for question style. Pair it with broader scenario practice from the main practice test site, since a short sample cannot cover all five modules in depth. For a compressed final review, the 4A0-107 cheat sheet is designed for the last day or two.
The 2026/27 Program Update and Your Timing
Nokia's program update, "Important updates are coming to the Service Routing Certification (SRC) Program in 2026/27," dated September 8, 2026, reduces the number of written exams required for SRA from eight to five and retains 4A0-107. The practical lab requirement is unchanged. For a candidate pursuing SRA, this is encouraging: the exam stays relevant even as the overall written burden shrinks.
Because the update changes the SRA structure, check the current SRA certification page before committing to a multi-exam plan, and confirm scheduling details on the official site. Our page on 4A0-107 exam dates covers how to book through Pearson VUE.
On the career side, the credential is aimed at engineers who design, deploy and troubleshoot service provider and enterprise IP/MPLS networks on Nokia platforms. Whether it moves the needle for you depends on your employer and role; see 4A0-107 jobs for the roles that tend to value it, and whether the certification is worth it for the broader return-on-investment picture.
Frequently Asked Questions
No official pass rate was verified in the reviewed public Nokia sources. Any specific percentage you see quoted without a named, dated source should be treated as unverified. Your own timed practice results are a more reliable guide.
An official passing percentage was not verified in the public sources reviewed. The documented facts are the format: 40 multiple-choice questions and 90 minutes of testing time. Aim for consistent strength in all five preparation modules rather than a target number.
Yes. The written exam has no mandatory waiting period and no attempt limit. Each attempt still requires the USD 125 fee and a new appointment, so a short, targeted review between attempts is the efficient approach.
No. The exam earns Service Routing Architect credit, but passing it alone does not award SRA. The certification also involves other written requirements and a separate seven-hour practical lab.
No. There are no mandatory exam prerequisites and training is optional. The course, Nokia Quality of Service (3FL30639AAAAZZZZA), is useful preparation, and Nokia's exam page directs candidates to its objectives and modules.