- The Short Answer: What the Code Refers To
- Reading the Code: Where QoS Sits in the Nokia Program
- What the Exam Actually Tests
- The Five Preparation Modules in Plain Language
- Format, Fee, and Scheduling Mechanics
- What Passing Does and Does Not Give You
- Who Hires for This Skill Set
- Sequencing Your Preparation Around the Modules
- Frequently Asked Questions
- 4A0-107 is Nokia's Quality of Service written exam (formerly Alcatel-Lucent), delivered through Pearson VUE.
- The exam has 40 multiple-choice questions, 90 minutes of testing, and a USD 125 fee.
- Passing 4A0-107 earns Service Routing Architect (SRA) credit, but it does not award SRA by itself.
- Five curriculum modules guide preparation: introduction, classification, queues and policers, hierarchical bandwidth allocation, and marking and remarking.
The Short Answer: What the Code Refers To
If you searched for "4A0-107" and landed here, the code refers to a specific Nokia certification exam: Nokia Quality of Service, exam code 4A0-107. The "4A0" prefix is a legacy of the Alcatel-Lucent era, before Nokia absorbed the company and its Service Routing Certification (SRC) program. The number identifies one written exam in that program, and that exam covers how IP/MPLS networks classify, queue, schedule, police, and mark traffic.
The acronym is not unique across the industry. Other credentials from other bodies use similar-looking codes, and it is easy to confuse them. This article is only about the Nokia exam. If you want a broader orientation first, our related explainers on what 4A0-107 is and the 4A0-107 meaning cover the same ground from different angles, and what 4A0-107 stands for addresses the naming question directly.
Reading the Code: Where QoS Sits in the Nokia Program
Nokia's Service Routing Certification program is a ladder of credentials for engineers who design, deploy, and operate IP/MPLS service provider networks. The program mixes written exams with a hands-on practical lab. Within that structure, 4A0-107 is the written exam dedicated to Quality of Service.
Think of it as one building block rather than a standalone credential. It contributes credit toward higher-level certifications, most notably the Service Routing Architect (SRA). It is also an accepted renewal option for several certifications, which we cover below. For a plain-language summary of what the credential represents as a whole, see our 4A0-107 certification overview and what 4A0-107 certification means.
What the Exam Actually Tests
QoS on a service router is not one feature. It is a chain of decisions that every packet passes through: how it is recognized, which queue it lands in, how that queue is serviced relative to others, whether it is rate-limited, and what markings it carries when it leaves. The exam tests whether you understand that chain well enough to predict behavior, not merely recite definitions.
Expect scenario-style multiple-choice questions where you reason about what happens to traffic given a particular configuration or topology. The current Nokia course cases and labs use MD-CLI (the model-driven command-line interface), so candidates who prepare with hands-on practice should be comfortable reading MD-CLI-style configuration.
The Five Preparation Modules in Plain Language
The exact exam page directs candidates to the objectives and modules of the Nokia Quality of Service course (course code 3FL30639AAAAZZZZA). The five headings below come from that curriculum. For a deeper treatment, our complete guide to the five 4A0-107 content areas goes topic by topic.
Domain 1: Introduction to QoS
The foundation. You need a clear mental model of why QoS exists and what problems it solves on a congested link.
- The core service characteristics QoS manages: bandwidth, delay, jitter, and loss
- Why forwarding classes and per-hop behavior matter in a service provider network
- Where QoS decisions occur along the packet path through a router
Domain 2: Traffic Classification
Before traffic can be treated differently, it must be identified. This module is about how the router decides what a packet is.
- Matching on packet header fields and existing markings
- Mapping traffic into forwarding classes and priority levels
- Trust boundaries: deciding when to honor incoming markings and when to override them
Domain 3: Queues and Policers
This is where most candidates spend the largest share of their study time, because the mechanics are detailed and the questions are often calculation-flavored.
- Queue parameters and how bandwidth is shared among queues
- Scheduling behavior and the distinction between guaranteed and best-effort access
- Policing versus shaping, and how each treats traffic that exceeds its rate
- Buffer behavior and what drives drops during congestion
Domain 4: Hierarchical Bandwidth Allocation
Real networks aggregate many subscribers or services onto shared links, so queues are arranged in tiers rather than in isolation.
- How schedulers are layered so that parent constraints limit child behavior
- Allocating bandwidth across customers, services, and classes at once
- Reasoning about what each tier contributes when several levels are active
Domain 5: Marking and Remarking
QoS only works end to end if downstream devices agree on what the traffic is. Marking is how that agreement is communicated.
- Writing priority values into packets and frames as they leave the router
- Remarking at network boundaries to enforce policy
- Keeping classification and marking consistent between ingress and egress
Format, Fee, and Scheduling Mechanics
The logistics are straightforward, and knowing them in advance removes avoidable stress on exam day.
| Item | 4A0-107 Detail |
|---|---|
| Delivery | Pearson VUE, proctored online or at a test center |
| Fee | USD 125 |
| Question count and type | 40 multiple-choice written questions |
| Language | English |
| Testing time | 90 minutes |
| Total appointment | 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 deserve emphasis. First, the 110-minute appointment is longer than the 90 minutes of actual testing because of the introductory survey, so plan your day around the full block. Second, "no mandatory prerequisites" means you can register without holding any earlier Nokia credential. Course prerequisites exist, but they are preparation guidance rather than eligibility gates. Our requirements guide explains the distinction in more detail, and the certification cost breakdown covers the budget side, including optional training that sits outside the exam fee.
On scoring: Nokia has not published an official passing percentage in the public sources reviewed, and no verified pass-rate statistic is available either. Be wary of any site quoting a precise cut score or pass rate as fact. We discuss what is and is not known on our passing score page and in what the pass-rate data shows.
What Passing Does and Does Not Give You
This is the point candidates most often get wrong. Passing 4A0-107 earns Service Routing Architect (SRA) credit. It does not, on its own, award the SRA certification.
Three separate activities are easy to blur together:
- The 90-minute written exam (4A0-107 itself), which is what this site's practice material targets.
- The four-day preparation course, which is optional training and a different activity from the exam.
- The separate seven-hour SRA practical lab, a hands-on assessment that is also distinct from the written exam.
Earning SRA involves the written exam credits plus the practical lab. Nokia has also announced a program update (published September 8, 2026) that reduces the SRA written requirement from eight exams to five and retains 4A0-107, with the practical lab unchanged. Since program rules can change, confirm current requirements on Nokia's official SRA page before planning.
Who Hires for This Skill Set
QoS knowledge is valued wherever IP/MPLS services carry mixed traffic with differing performance needs. In practice that means roles at service providers, network integrators, and large enterprises running carrier-grade infrastructure, including network engineers, service-delivery and operations staff, and architects who design multi-service networks on Nokia service routing platforms.
Employers rarely list "4A0-107" as a line item. They look for the underlying capability: can you reason about congestion, protect latency-sensitive traffic, and keep markings consistent across a provider network? The certification is evidence of that capability. Our jobs overview looks at the kinds of roles that value it, while the salary guide and the ROI analysis help you weigh the investment. Since we do not have verified compensation figures for this exam specifically, we avoid quoting numbers here.
Sequencing Your Preparation Around the Modules
You do not need an elaborate method. The most useful principle is to follow the packet's path through the router, because the five modules build on each other in that order. A sensible allocation gives the heaviest hands-on time to the queue and policer material, since it is the densest.
Introduction and Classification
- Build the service-characteristics vocabulary and the packet-path model
- Practice how traffic is matched and assigned to forwarding classes
Queues and Policers
- Work through scheduling, queue parameters, and policing versus shaping
- Do worked examples, since these questions reward reasoning over memorization
Hierarchical Allocation and Marking
- Trace how parent and child schedulers interact
- Review ingress classification against egress marking for consistency
Timed Practice
- Take full 40-question sets against a 90-minute clock
- Revisit whichever module your misses cluster in
This is a template, not a rule; adjust it to your background. Engineers who already configure QoS daily may compress the early weeks. For a fuller plan, read our 4A0-107 study guide, and keep the one-page cheat sheet nearby for final review. If you are wondering how demanding the material is, see how hard the exam is. Nokia also links a public practice document, "Practice Exam Questions for Nokia Quality of Service (4A0-107)" (document code CID202017), which is worth working through to get a feel for question style. For timed practice beyond that, you can try our practice tests.
Key Takeaway
Do not study the five modules as isolated lists. Trace a single packet from classification, through its queue and any policer, up through hierarchical schedulers, to the marking it carries on egress. If you can narrate that journey for any scenario, you are prepared for most of what the exam asks.
Frequently Asked Questions
It is the exam code for Nokia's Quality of Service written exam, a legacy of the Alcatel-Lucent naming scheme. It covers how IP/MPLS service routers classify, queue, police, schedule, and mark traffic. See also our page on what 4A0-107 means.
The exam has 40 multiple-choice questions in English with 90 minutes of testing time. The full appointment is 110 minutes because it includes a 20-minute introductory survey.
No. It earns SRA credit, but SRA also involves other written credits and the separate seven-hour practical lab. Check Nokia's SRA page for current requirements, since the program is being updated.
No. There are no mandatory exam prerequisites, and the four-day course is optional preparation. You can register for the exam without completing it.
Yes. Written-exam retakes have no mandatory waiting period or attempt limit, though each attempt carries the exam fee. Consider reviewing your weakest module before sitting again, and check the scheduling guide for booking details.