- A
Java API
Why wrong: Java API is for development, not a core component.
- B
YANG service model
Service models in YANG define the service logic.
- C
SNMP
Why wrong: NSO primarily uses NETCONF/RESTCONF/CLI, not SNMP.
- D
CDB
Configuration database stores device and service configs.
- E
NED
Network Element Driver abstracts device specifics.
Question 681 of 1,000
350-501 Automation and Quality of Services Practice Question
This 350-501 practice question tests your understanding of automation and quality of services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
When automating service provisioning with NSO, which three components are part of the NSO architecture? (Choose three.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
YANG service model
Option B is correct because the YANG service model is a core component of NSO architecture. It defines the service logic and data model that translates high-level service requests into device-specific configurations. NSO uses YANG to model both services and devices, enabling automation of service provisioning.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Java API
Why it's wrong here
Java API is for development, not a core component.
- ✓
YANG service model
Why this is correct
Service models in YANG define the service logic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
SNMP
Why it's wrong here
NSO primarily uses NETCONF/RESTCONF/CLI, not SNMP.
- ✓
CDB
Why this is correct
Configuration database stores device and service configs.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
NED
Why this is correct
Network Element Driver abstracts device specifics.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between NSO's core architectural components (YANG service models, CDB, NEDs) and external interfaces or protocols (like Java API or SNMP), which are not part of the internal architecture but rather integration points.
Detailed technical explanation
How to think about this question
NSO's architecture consists of three main layers: the service layer (YANG service models), the database layer (CDB, which stores configuration and state data), and the device manager layer (NEDs, which translate between NSO's internal models and device-native interfaces). CDB uses a transactional, in-memory database that ensures consistency across multi-device changes, while NEDs abstract device-specific syntax into a common YANG model.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 350-501 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Automation and Quality of Services — study guide chapter
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FAQ
Questions learners often ask
What does this 350-501 question test?
Automation and Quality of Services — This question tests Automation and Quality of Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: YANG service model — Option B is correct because the YANG service model is a core component of NSO architecture. It defines the service logic and data model that translates high-level service requests into device-specific configurations. NSO uses YANG to model both services and devices, enabling automation of service provisioning.
What should I do if I get this 350-501 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.
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