- What Nokia 4A0-107 Actually Tests
- Format, Fee, and Scheduling Mechanics
- The Five Curriculum Modules in Depth
- Why MD-CLI Fluency Matters Even in a Written Exam
- Sequencing the Modules Across Your Prep
- Reading Multiple-Choice QoS Questions Like an Engineer
- Where 4A0-107 Fits in the SRC Path
- Resources Worth Using, and What They Cannot Tell You
- Frequently Asked Questions
- 4A0-107 is Nokia's Quality of Service written exam: 40 multiple-choice questions, 90 testing minutes, USD 125 via Pearson VUE.
- Nokia's public curriculum lists five unweighted modules, so prepare all of them rather than guessing at percentages.
- Current Nokia course cases and labs use MD-CLI, so learn QoS configuration in that syntax.
- Passing 4A0-107 earns SRA credit but does not award Service Routing Architect by itself.
What Nokia 4A0-107 Actually Tests
Nokia 4A0-107 is the Nokia (formerly Alcatel-Lucent) Quality of Service written exam, part of the Service Routing Certification (SRC) program. It is not a general networking exam, and it is not any other credential that happens to share a similar code. If you are still orienting yourself, What Is 4A0-107? covers the basics, and this guide assumes you are ready to prepare.
The exam covers how a Nokia service router classifies, queues, polices, schedules, and marks traffic. Nokia directs candidates from the exam page to the objectives and modules of its Nokia Quality of Service course (course code 3FL30639AAAAZZZZA). That course is your most authoritative map of the scope, and everything in this guide hangs off it.
Format, Fee, and Scheduling Mechanics
Knowing the logistics removes surprises on exam day. The verified details are straightforward:
| Item | 4A0-107 Detail |
|---|---|
| Delivery | Pearson VUE, proctored online or at a test center |
| Fee | USD 125 |
| Questions | 40 multiple-choice written questions, in 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 |
Ninety minutes for 40 questions works out to a comfortable pace of a little over two minutes per question, which means time pressure is rarely about speed. It is about whether you can reason through a configuration scenario without second-guessing yourself. The 20-minute survey is not part of your testing time, so do not mentally subtract it from your 90 minutes.
No official passing percentage was verified in the public sources reviewed, so be wary of any site quoting a firm cut score. Our pages on the 4A0-107 passing score and the 4A0-107 pass rate explain what is and is not known. For the money side, see the 4A0-107 certification cost breakdown, and for eligibility questions, 4A0-107 requirements. Scheduling specifics live in 4A0-107 exam dates.
The Five Curriculum Modules in Depth
Here is what you need to be able to do in each module. For a longer treatment, see the complete guide to all 5 content areas.
Domain 1: Introduction to QoS
This is the conceptual foundation. Before configuring anything, you need to understand why QoS exists and the vocabulary every later module assumes.
- The purpose of QoS: managing congestion, latency, jitter, and loss for different traffic types
- How per-hop behavior differs from end-to-end service guarantees
- Where in a router's forwarding path QoS decisions are made (ingress versus egress)
- The terms you will see throughout: forwarding class, queue, policer, scheduler, marking
Domain 2: Traffic Classification
Classification decides which treatment a packet receives. Questions here tend to be scenario-based: given a packet and a policy, which forwarding class and profile does it land in?
- Matching on packet fields such as DSCP, IP precedence, dot1p, and MPLS EXP/TC values
- Matching with filter-style criteria rather than just trusting existing markings
- How forwarding class and in-profile/out-of-profile status are assigned at ingress
- What happens when multiple classification criteria could apply to the same packet
Domain 3: Queues and Policers
This is the module most candidates find heaviest, because it combines rate concepts with the behavior of buffers under load.
- Queue parameters: committed and peak information rates, burst sizes, and queue depth
- The difference between policing (drop or remark excess) and shaping/queuing (buffer excess)
- How in-profile and out-of-profile traffic is treated differently inside a queue
- Queue behavior under congestion, including how buffer thresholds affect drop decisions
Domain 4: Hierarchical Bandwidth Allocation
Real networks aggregate many services onto shared links, so the scheduling hierarchy matters. This module is about how bandwidth is divided among competing queues and levels.
- Scheduler concepts: priority levels, weights, and rate limits at each tier
- How parent-child scheduling shares bandwidth when some queues are idle
- Why strict priority can starve lower classes without a rate cap
- Tracing how a single packet's treatment is determined by its position in the hierarchy
Domain 5: Marking and Remarking
Marking communicates treatment to the next device. Getting it wrong quietly breaks end-to-end behavior, so exam scenarios often test whether you can predict the outgoing marking.
- Writing DSCP, dot1p, and MPLS values on egress based on forwarding class and profile
- Trust boundaries: when to accept inbound markings versus overwrite them
- How marking at ingress, egress, or both changes what downstream devices see
- Remarking excess or out-of-profile traffic to a lower-priority value
Why MD-CLI Fluency Matters Even in a Written Exam
Nokia states that current course cases and labs use MD-CLI. That is a useful signal: the vocabulary, hierarchy, and configuration structure you see in current training are expressed in MD-CLI, and exam questions that show configuration snippets are likely to reflect the same style. The exam is multiple-choice, not a live lab, but reading a configuration quickly is a core skill when a question shows you a block and asks what it does.
Practical ways to build this fluency:
- Read QoS policies in MD-CLI form until you can predict a forwarding class assignment without running anything.
- Practice spotting what a configuration does not do, such as a policer with no explicit action for excess traffic.
- If you have access to lab equipment or a virtualized router, build one policy per module and break it deliberately to see the behavior change.
Do not confuse this with the separate seven-hour SRA practical lab. That lab is a different activity from the 90-minute written exam. Your 4A0-107 preparation should still be configuration-literate, but the written format rewards reading and reasoning more than typing speed.
Sequencing the Modules Across Your Prep
Generic study advice will not help much here, but the module order matters, because each topic leans on the previous one. A sensible schedule follows the packet's journey. Adjust the length to your starting point; a candidate already working with service routers daily may compress this considerably.
Introduction to QoS and Traffic Classification
- Lock down the vocabulary and the ingress/egress model first
- Work through classification until you can map any packet to a forwarding class by hand
Queues and Policers
- Spend the most time here; it is the densest module
- Practice rate and burst reasoning, and the policing-versus-queuing distinction
Hierarchical Bandwidth Allocation
- Trace bandwidth through multi-level schedulers with idle and busy queues
- Revisit queue concepts whenever the hierarchy exposes a gap
Marking and Remarking, then full review
- Cover egress marking and trust boundaries
- Finish with mixed-topic practice questions to test cross-module reasoning
The reason for putting Queues and Policers early and giving it the most time is that Hierarchical Bandwidth Allocation is essentially queue behavior applied at scale. If queues are shaky, the hierarchy will feel opaque. For more on how demanding each area tends to be, read how hard the 4A0-107 exam is.
Reading Multiple-Choice QoS Questions Like an Engineer
Trace the packet, not the keyword
The most common error on QoS exams is matching a familiar term to an answer without checking the scenario. If a question mentions a policer, do not jump to "drops excess traffic." Read what action the policy specifies, and where in the path it is applied.
Watch for direction and location
Ingress and egress treatments differ, and many wrong answers are right answers applied at the wrong place. When a question describes a marking or a queue, confirm which direction and which interface the configuration is bound to before choosing.
Eliminate on behavior, not on wording
With four options, you can often discard two by asking what each would actually do to the traffic. Two options that look similar usually differ in one parameter, such as whether excess traffic is dropped or remarked. Finding that single difference is usually the whole question.
Key Takeaway
For every scenario question, state three things before looking at the options: where the packet enters, what class and profile it receives, and what the egress treatment should be. Then pick the option that matches your own prediction.
Where 4A0-107 Fits in the SRC Path
This exam earns Service Routing Architect (SRA) credit, but passing it alone does not award SRA. The SRA also involves the separate seven-hour practical lab. The credential-maintenance rules are also worth knowing: SRC certifications are valid for three years, with recertification available before termination six months after expiry, and 4A0-107 is an accepted renewal option for NRS I, NRS II, and SRA. These are credential-maintenance rules, not a separately established exam-credit expiry.
Nokia's program update, Important updates are coming to the Service Routing Certification (SRC) Program in 2026/27, dated September 8, 2026, reduces SRA written requirements from eight to five and retains 4A0-107, with the practical lab unchanged. Because the requirement set is changing, confirm the current SRA written-exam list on Nokia's official SRA page before committing to a multi-exam plan. For the broader picture of what the credential does for a career, see whether the 4A0-107 certification is worth it, the salary guide, and 4A0-107 jobs.
Who tends to value this exam
Because it is a Nokia service routing credential, the employers who recognize it most are service providers and integrators that run Nokia IP/MPLS platforms, along with the engineers who design and operate those networks. QoS knowledge is especially relevant for anyone responsible for delivering differentiated services such as business VPNs, voice, and video across a shared core.
Resources Worth Using, and What They Cannot Tell You
Nokia's four-day preparation course, Nokia Quality of Service, is optional, and there is no mandatory prerequisite for taking the exam. The course's objectives and modules are the best statement of scope available, even if you never enroll; read them as a checklist. More detail on the course side is in 4A0-107 training.
Nokia also links a public practice document, Practice Exam Questions for Nokia Quality of Service (4A0-107), copyright 2024, document code (June) CID202017. Use it to calibrate the style of questions, but remember that no practice material proves what the live exam contains. For additional timed practice that mirrors the 40-question, 90-minute format, use the 4A0-107 practice tests, and keep the 4A0-107 cheat sheet handy for last-day review.
A realistic readiness check
You are ready when you can do three things without notes: take a fresh scenario and trace a packet from ingress classification to egress marking, explain why a given policer or queue setting changes the outcome, and complete a mixed 40-question set comfortably inside 90 minutes. Because there is no mandatory retake delay or attempt limit, a first attempt is not a one-shot event, but each attempt carries the USD 125 fee, so it is worth arriving prepared. If you want more timed repetition first, the main practice test site is the place to build it, and the foundational 4A0-107 study guide pairs well with this one.
Frequently Asked Questions
The exam has 40 multiple-choice written questions in English, with 90 minutes of testing time. The appointment is 110 minutes because it includes a 20-minute introductory survey.
The fee is USD 125. It is delivered through Pearson VUE, proctored either online or at a test center.
No exam prerequisites are mandatory, and training is optional. The Nokia Quality of Service course has its own preparation guidance, but it is separate from exam eligibility.
No official passing percentage or pass-rate statistic was verified in the public sources reviewed, so treat any specific figure you see elsewhere with caution and aim for solid mastery of all five modules.
No. The exam earns SRA credit, but passing it alone does not award SRA. The SRA path also includes the separate seven-hour practical lab, and the written-exam requirements are changing under Nokia's 2026/27 program update, so check Nokia's current SRA page.