350-501 Automation and Quality of Services Practice Question
In an SP network using NSO for service orchestration, which component abstracts device-specific CLI or SNMP interactions into a common model for NETCONF/RESTCONF southbound communication?
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
✓
NED (Network Element Driver)
The Network Element Driver (NED) provides the abstraction layer between NSO and network devices, translating YANG models to device-specific configurations (e.g., CLI, SNMP).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
YANG model
Why it's wrong here
YANG models define data structures, not device communication.
- ✗
CDB (Configuration Database)
Why it's wrong here
CDB stores configuration and operational data, not device abstraction.
- ✗
RESTCONF northbound API
Why it's wrong here
Northbound API connects to OSS/BSS, not device abstraction.
- ✓
NED (Network Element Driver)
Why this is correct
NED abstracts device-specific operations to a common YANG model.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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