350-501 Automation and Quality of Services Practice Question
When automating service provisioning with NSO, which three components are part of the NSO architecture? (Choose three.)
⚠ Common exam trap
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.
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
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.
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.
- ✗
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.
- ✓
NED
Why this is correct
Network Element Driver abstracts device specifics.
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