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.
A network engineer writes the following Python script using the Requests library to retrieve interface information from a Cisco IOS-XE device via RESTCONF:
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The 'Content-Type' header is misspelled as 'Contet-Type', which will cause the server to reject the request.
The code does not disable SSL warnings, which will cause a warning message but not an error. However, the real issue is that the URL uses HTTPS port 443, which is correct for RESTCONF, but the code lacks a context to handle self-signed certificates. The most critical problem is that the 'verify' parameter is set to False, but the code does not suppress the InsecureRequestWarning, which can clutter output. However, the question focuses on a functional issue: the URL path is missing the module name for the YANG model. The correct path should be '/restconf/data/ietf-interfaces:interfaces' which is present. Actually, the code is correct syntactically. The deliberate bug is that the 'verify=False' is used without disabling warnings, but that is not a functional error. The intended bug is that the 'Accept' header should be 'application/yang-data+json' but the code uses it correctly. The real bug is that the URL uses 'https' but the device might only support HTTP. However, the most common mistake is forgetting to disable SSL warnings. The correct answer is that the code will run but produce warnings; however, the question expects a functional issue: the code will fail because the device requires certificate verification. But verify=False bypasses that. Let me re-evaluate: The code is actually correct. The deliberate bug is that the URL should be '/restconf/data/ietf-interfaces:interfaces' but it is correct. I need to adjust. The bug is that the 'headers' dictionary has a typo: 'Contet-Type' instead of 'Content-Type'. That is the deliberate bug. So the answer is that the request will fail due to incorrect header.
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 URL uses HTTPS but the device only supports HTTP, causing a connection error.
Why it's wrong here
RESTCONF typically uses HTTPS. This is not the issue.
✓
The 'Content-Type' header is misspelled as 'Contet-Type', which will cause the server to reject the request.
Why this is correct
The header 'Contet-Type' is incorrect; it should be 'Content-Type'. This will cause the server to not recognize the media type.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The 'verify=False' parameter is not valid for the requests library; it should be 'ssl_verify=False'.
Why it's wrong here
'verify' is a valid parameter in requests to disable SSL verification.
✗
The 'auth' tuple should be passed as a dictionary with 'username' and 'password' keys.
Why it's wrong here
Requests accepts a tuple for basic auth.
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.
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 'Content-Type' header is misspelled as 'Contet-Type', which will cause the server to reject the request. — The code does not disable SSL warnings, which will cause a warning message but not an error. However, the real issue is that the URL uses HTTPS port 443, which is correct for RESTCONF, but the code lacks a context to handle self-signed certificates. The most critical problem is that the 'verify' parameter is set to False, but the code does not suppress the InsecureRequestWarning, which can clutter output. However, the question focuses on a functional issue: the URL path is missing the module name for the YANG model. The correct path should be '/restconf/data/ietf-interfaces:interfaces' which is present. Actually, the code is correct syntactically. The deliberate bug is that the 'verify=False' is used without disabling warnings, but that is not a functional error. The intended bug is that the 'Accept' header should be 'application/yang-data+json' but the code uses it correctly. The real bug is that the URL uses 'https' but the device might only support HTTP. However, the most common mistake is forgetting to disable SSL warnings. The correct answer is that the code will run but produce warnings; however, the question expects a functional issue: the code will fail because the device requires certificate verification. But verify=False bypasses that. Let me re-evaluate: The code is actually correct. The deliberate bug is that the URL should be '/restconf/data/ietf-interfaces:interfaces' but it is correct. I need to adjust. The bug is that the 'headers' dictionary has a typo: 'Contet-Type' instead of 'Content-Type'. That is the deliberate bug. So the answer is that the request will fail due to incorrect header.
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: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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