200-901 Cisco Platforms and Development Practice Question
This 200-901 practice question tests your understanding of cisco platforms and development. 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.
A network engineer needs to automate the deployment of a new VLAN on multiple Cisco switches using RESTCONF. Which URL structure should be used to create a VLAN with ID 100?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
PUT /restconf/data/Cisco-IOS-XE-vlan:vlans/vlan=100
Option A is correct because RESTCONF uses the HTTP PUT method to create or replace a specific data resource, and the URL path follows the YANG module structure. Here, 'Cisco-IOS-XE-vlan:vlans/vlan=100' targets the VLAN list entry with ID 100, creating it if it does not exist. This aligns with RESTCONF's resource-oriented design, where PUT on a specific data node performs a create or replace operation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
PUT /restconf/data/Cisco-IOS-XE-vlan:vlans/vlan=100
Why this is correct
PUT creates or replaces the VLAN resource at the specified URI.
Related concept
Read the scenario before looking for a memorised answer.
✗
POST /restconf/operations/Cisco-IOS-XE-vlan:create-vlan
Why it's wrong here
This is an RPC operation, not a data resource creation.
✗
POST /restconf/data/Cisco-IOS-XE-vlan:vlans/vlan=100
Why it's wrong here
POST is not used to create a specific resource; PUT is appropriate.
✗
PUT /restconf/config/vlan/100
Why it's wrong here
This path is not compliant with the YANG module namespace.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between PUT and POST in RESTCONF, where candidates mistakenly use POST to create a specific resource instance (like a VLAN by ID) instead of PUT, or confuse the '/operations' RPC path with data resource manipulation.
Detailed technical explanation
How to think about this question
RESTCONF (RFC 8040) maps YANG data trees to URL paths under '/restconf/data', and the 'PUT' operation on a specific list instance (e.g., 'vlans/vlan=100') performs a 'create or replace' action. The YANG module 'Cisco-IOS-XE-vlan' defines the 'vlans' container with a 'vlan' list keyed by 'id', so the URL must include the key value in the path. In real-world automation, using PUT ensures idempotency—re-running the same request does not cause duplicate VLANs or errors, which is critical for CI/CD pipelines.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Cisco Platforms and Development — This question tests Cisco Platforms and Development — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: PUT /restconf/data/Cisco-IOS-XE-vlan:vlans/vlan=100 — Option A is correct because RESTCONF uses the HTTP PUT method to create or replace a specific data resource, and the URL path follows the YANG module structure. Here, 'Cisco-IOS-XE-vlan:vlans/vlan=100' targets the VLAN list entry with ID 100, creating it if it does not exist. This aligns with RESTCONF's resource-oriented design, where PUT on a specific data node performs a create or replace operation.
What should I do if I get this 200-901 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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