Question 1,730 of 2,015

REST APIs and Data Models →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is an incorrect URI, specifically the unnecessary '/configuration' suffix appended to the module path. A 501 Not Implemented error in RESTCONF indicates the server received the request but cannot process it because the targeted resource does not exist or is unsupported; here, the running configuration is accessed via the base module path like `/restconf/data/Cisco-IOS-XE-native:native`, not by adding a sub-resource like `/configuration`. On the ENCOR 350-401 exam, this tests your understanding that RESTCONF uses YANG modules to define data models, and a common trap is assuming a hierarchical path mirrors CLI or NETCONF structure when it must match the exact YANG schema. Remember that the 501 error is your clue to check the URI syntax first, not the datastore or authentication. A useful memory tip: “No suffix, just the module—501 means your path has a problem.”

350-401 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 developing a script to automate the backup of running configurations from multiple Cisco IOS-XE devices using RESTCONF. The script sends a GET request to 'https://device/restconf/data/Cisco-IOS-XE-native:native/configuration' and receives a 501 Not Implemented error. 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.

Question 1mediummultiple choice

Read the full REST/YANG explanation →

A
The device does not support RESTCONF; the engineer must use NETCONF for configuration backup.
Why wrong: Incorrect because IOS-XE supports RESTCONF; the error is specific to the URI.
B
The URI is incorrect; the running configuration is under 'ietf-netconf-monitoring:netconf-state/capabilities'.
Why wrong: Incorrect because that URI is for capabilities, not the running configuration.
C
The URI is incorrect; the running configuration is accessed via the 'Cisco-IOS-XE-native:native' module without the '/configuration' suffix.
Correct because the native model does not have a 'configuration' container; the correct URI is '/restconf/data/Cisco-IOS-XE-native:native'.
D
The request must use the POST method instead of GET to retrieve the running configuration.
Why wrong: Incorrect because GET is the correct method to retrieve data; POST is for creating resources.

Full breakdown with real-world context →

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; the running configuration is accessed via the 'Cisco-IOS-XE-native:native' module without the '/configuration' suffix.

The 501 error indicates that the server does not support the functionality required to fulfill the request. In this case, the URI is incorrect because the running configuration is typically accessed via the 'ietf-netconf-monitoring' module or a specific Cisco module like 'Cisco-IOS-XE-native:native' but the path should be '/restconf/data/Cisco-IOS-XE-native:native' without '/configuration'. However, the more common issue is that the running configuration is not directly available via RESTCONF; it is available via NETCONF or via the 'operational' datastore. The correct approach is to use the 'ietf-netconf-monitoring' module or the 'cisco-native' module with the correct path.

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 device does not support RESTCONF; the engineer must use NETCONF for configuration backup.
Why it's wrong here
Incorrect because IOS-XE supports RESTCONF; the error is specific to the URI.
✗
The URI is incorrect; the running configuration is under 'ietf-netconf-monitoring:netconf-state/capabilities'.
Why it's wrong here
Incorrect because that URI is for capabilities, not the running configuration.
✓
The URI is incorrect; the running configuration is accessed via the 'Cisco-IOS-XE-native:native' module without the '/configuration' suffix.
Why this is correct
Correct because the native model does not have a 'configuration' container; the correct URI is '/restconf/data/Cisco-IOS-XE-native:native'.
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 request must use the POST method instead of GET to retrieve the running configuration.
Why it's wrong here
Incorrect because GET is the correct method to retrieve data; POST is for creating resources.

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; the running configuration is accessed via the 'Cisco-IOS-XE-native:native' module without the '/configuration' suffix. — The 501 error indicates that the server does not support the functionality required to fulfill the request. In this case, the URI is incorrect because the running configuration is typically accessed via the 'ietf-netconf-monitoring' module or a specific Cisco module like 'Cisco-IOS-XE-native:native' but the path should be '/restconf/data/Cisco-IOS-XE-native:native' without '/configuration'. However, the more common issue is that the running configuration is not directly available via RESTCONF; it is available via NETCONF or via the 'operational' datastore. The correct approach is to use the 'ietf-netconf-monitoring' module or the 'cisco-native' module with the correct path.

What should I do if I get this 350-401 question wrong?

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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