- A
The interface name must be URL-encoded because it contains a slash.
Why wrong: Incorrect because 'GigabitEthernet1' does not contain a slash; URL encoding is not the issue here.
- B
The URI is incorrect; statistics are under 'interfaces-state' not 'interfaces'.
Correct because operational state data like statistics is in the 'interfaces-state' container, while 'interfaces' contains configuration data.
- C
The device requires authentication; the script must include a valid token.
Why wrong: Incorrect because a 404 error indicates resource not found, not authentication failure (which would be 401).
- D
The REST API is not enabled on the device; the engineer must enable it first.
Why wrong: Incorrect because if the API were not enabled, the response would likely be a connection error or 403, not 404.
Quick Answer
The answer is that the URI is incorrect because interface statistics reside under the `interfaces-state` container, not the `interfaces` container in the ietf-interfaces YANG model. This 404 error occurs because RESTCONF URIs must exactly match the YANG module’s data hierarchy; the `interfaces` container holds configuration data, while operational statistics like counters and errors are stored separately in `interfaces-state`. On the ENCOR 350-401 exam, this question tests your understanding of the distinction between config and operational state in NETCONF/RESTCONF, a common trap where candidates mistakenly assume all interface data lives under one path. The correct URI should be `ietf-interfaces:interfaces-state/interface=GigabitEthernet1/statistics`. Memory tip: think “state” for stats—if it’s live operational data, look for `-state` in the YANG path.
CCNP REST APIs and Data Models Practice Question
This 350-401 practice question tests your understanding of rest apis and data models. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
An engineer is using a Python script to retrieve interface statistics from a Cisco IOS-XE device via the REST API. The script sends a GET request to 'https://device/restconf/data/ietf-interfaces:interfaces/interface=GigabitEthernet1/statistics' and receives a 404 Not Found response. The interface exists and is operational. What is the most likely issue?
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 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
The URI is incorrect; statistics are under 'interfaces-state' not 'interfaces'.
The 404 error indicates the resource was not found. In RESTCONF, the URI must use the correct encoding for interface names, especially if they contain special characters like a slash. The interface name 'GigabitEthernet1' should be URL-encoded as 'GigabitEthernet1' (no encoding needed here), but the issue is that the URI path must match the YANG module structure exactly. The statistics data is often under a separate container like 'interfaces-state' in the ietf-interfaces model, not directly under 'interface'. The correct URI for operational statistics is typically 'ietf-interfaces:interfaces-state/interface=GigabitEthernet1/statistics'.
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 interface name must be URL-encoded because it contains a slash.
Why it's wrong here
Incorrect because 'GigabitEthernet1' does not contain a slash; URL encoding is not the issue here.
- ✓
The URI is incorrect; statistics are under 'interfaces-state' not 'interfaces'.
Why this is correct
Correct because operational state data like statistics is in the 'interfaces-state' container, while 'interfaces' contains configuration data.
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 device requires authentication; the script must include a valid token.
Why it's wrong here
Incorrect because a 404 error indicates resource not found, not authentication failure (which would be 401).
- ✗
The REST API is not enabled on the device; the engineer must enable it first.
Why it's wrong here
Incorrect because if the API were not enabled, the response would likely be a connection error or 403, not 404.
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 350-401 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this 350-401 question test?
REST APIs and Data Models — This question tests REST APIs and Data Models — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The URI is incorrect; statistics are under 'interfaces-state' not 'interfaces'. — The 404 error indicates the resource was not found. In RESTCONF, the URI must use the correct encoding for interface names, especially if they contain special characters like a slash. The interface name 'GigabitEthernet1' should be URL-encoded as 'GigabitEthernet1' (no encoding needed here), but the issue is that the URI path must match the YANG module structure exactly. The statistics data is often under a separate container like 'interfaces-state' in the ietf-interfaces model, not directly under 'interface'. The correct URI for operational statistics is typically 'ietf-interfaces:interfaces-state/interface=GigabitEthernet1/statistics'.
What should I do if I get this 350-401 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 350-401 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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Last reviewed: Jun 18, 2026
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