The answer is that the request path includes a specific interface key, which filters the result to a single interface. When a RESTCONF request to retrieve operational data for all interfaces returns only one interface, the most likely cause is that the path contains a key like '/interface=GigabitEthernet0/0/0' instead of the broader '/interfaces' container. This is a common trap on the Cisco SPCOR 350-501 exam, where candidates must understand that RESTCONF path filtering is exact—including a key narrows the response to that specific instance, even if the HTTP method and YANG model are correct. The exam tests your ability to distinguish between retrieving a list versus a single resource, often hiding the key in a long URI. To avoid this mistake, remember the memory tip: "No key, no filter—keep the path wide to see the whole side."
350-501 Automation and Assurance Practice Question
This 350-501 practice question tests your understanding of automation and assurance. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Exhibit
Refer to the exhibit.
! RESTCONF GET request
! GET /restconf/data/Cisco-IOS-XE-interfaces-oper:interfaces/interface=GigabitEthernet0/0/0
! Response:
HTTP/1.1 200 OK
{
"Cisco-IOS-XE-interfaces-oper:interface": [
{
"name": "GigabitEthernet0/0/0",
"admin-status": "up",
"oper-status": "up",
"statistics": {
"input-bps": 1500000,
"output-bps": 2000000
}
}
]
}
Refer to the exhibit. An engineer makes a RESTCONF request to retrieve operational data for all interfaces, but the response shows only one interface. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The request path includes a specific interface key, filtering the result
The request path includes '/interface=GigabitEthernet0/0/0', which filters the list to that specific interface. To retrieve all interfaces, the path should be '/interfaces' without the key. The YANG model is supported (200 OK), the HTTP method is correct, telemetry and VRFs are irrelevant.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The interfaces are in different VRFs
Why it's wrong here
RESTCONF retrieves interface data from the global VRF by default; VRFs do not affect the interface list.
✗
The device does not support the YANG model
Why it's wrong here
The 200 OK response confirms the model is supported.
✓
The request path includes a specific interface key, filtering the result
Why this is correct
The path '/interface=GigabitEthernet0/0/0' selects only that interface; to get all, use '/interfaces'.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The engineer used the wrong HTTP method
Why it's wrong here
GET is the correct method to retrieve data; a wrong method would return an error.
✗
The collector is not subscribed to telemetry
Why it's wrong here
RESTCONF is a synchronous API, unrelated to telemetry subscriptions.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-501 NAT questions on configuration and troubleshooting.
Automation and Assurance — This question tests Automation and Assurance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The request path includes a specific interface key, filtering the result — The request path includes '/interface=GigabitEthernet0/0/0', which filters the list to that specific interface. To retrieve all interfaces, the path should be '/interfaces' without the key. The YANG model is supported (200 OK), the HTTP method is correct, telemetry and VRFs are irrelevant.
What should I do if I get this 350-501 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-501 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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