350-501 Automation and Quality of Services Practice Question
Which three components are part of NSO (Network Services Orchestrator) architecture? (Choose three.)
⚠ Common exam trap
Cisco often tests the distinction between protocols that NSO can orchestrate (like PCEP for path computation) versus components that are part of NSO's internal architecture (like NEDs, CDB, and YANG models), leading candidates to mistakenly select external protocols as architectural components.
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 models for service definitions
YANG models are the foundation for service definitions in NSO because they define the data structures and constraints for network services using a standardized modeling language (RFC 6020/7950). NSO uses YANG to model both the service layer (customer-facing services) and the device layer (native device configurations), enabling service abstraction and multi-vendor orchestration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RADIUS server
Why it's wrong here
RADIUS is for AAA, not NSO architecture.
- ✓
YANG models for service definitions
Why this is correct
YANG models define service structures in NSO.
- ✗
PCEP (Path Computation Element Protocol)
Why it's wrong here
PCEP is used for SR-TE, not part of NSO core.
- ✓
CDB (Configuration Database)
Why this is correct
CDB stores the actual device configurations.
- ✓
NED (Network Element Driver)
Why this is correct
NEDs abstract device-specific CLI/Netconf.
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