350-501 Automation and Quality of Services Practice Question
Which THREE statements are true regarding NSO's NED? (Choose three.)
⚠ Common exam trap
Cisco often tests the misconception that NEDs generate YANG models or perform path computation, when in fact NEDs are purely abstraction layers for southbound communication and device configuration.
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 can support NETCONF, SNMP, or CLI as southbound protocols
NSO's NED (Network Equipment Driver) is the component that abstracts the southbound communication between NSO and network devices. NEDs can use NETCONF, SNMP, or CLI as the southbound protocol to translate NSO's device-independent configuration into device-specific commands, enabling multi-vendor management.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
NED automatically generates YANG models
Why it's wrong here
NEDs are developed manually or using tools, but not automatically generated.
- ✗
NED is used for path computation in SR-TE
Why it's wrong here
Path computation is done by PCE.
- ✓
NED can support NETCONF, SNMP, or CLI as southbound protocols
Why this is correct
NEDs support multiple protocols.
- ✓
NED is installed in NSO as a package
Why this is correct
NEDs are installed as packages.
- ✓
NED provides device abstraction, hiding vendor-specific details
Why this is correct
NED abstracts the device specifics.
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