- A
The module name is incorrect; it should be cisco.dnac.network_vlan.
Why wrong: The module cisco.dnac.vlan is valid for managing VLANs in DNA Center.
- B
The playbook does not include a task to obtain an authentication token, which is required by DNA Center API.
Why wrong: The cisco.dnac collection modules handle authentication internally if host, username, and password are provided.
- C
The 'site_id' parameter is mandatory for creating a VLAN in DNA Center; if missing, the task will fail.
Correct. DNA Center requires a site ID to associate the VLAN with a specific site. Without it, the API call will return an error.
- D
The 'state: present' is invalid; it should be 'state: create'.
Why wrong: 'state: present' is the correct parameter to ensure the VLAN exists. 'create' is not a valid state.
Quick Answer
The answer is that the playbook will fail because the `site_id` parameter is mandatory for VLAN creation via the Cisco DNA Center intent API. The `cisco.dnac.vlan` module requires this parameter to associate the VLAN with a specific network site within DNA Center’s hierarchical inventory; without it, the API call cannot determine where the VLAN should be provisioned, resulting in an error. On the ENCOR 350-401 exam, this tests your understanding of DNA Center’s intent-based model, where network resources like VLANs must be tied to a site—a common trap is assuming VLAN creation works like a direct CLI command on a device. Remember the memory tip: “No site, no VLAN—DNA Center needs a home for every VLAN.”
CCNP Cisco DNA Center Practice Question
This 350-401 practice question tests your understanding of cisco dna center. 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 Ansible playbook is written to configure a VLAN on a Cisco IOS-XE device via Cisco DNA Center's intent API:
- name: Configure VLAN via DNA Center hosts: localhost gather_facts: no tasks: - name: Create VLAN 100 cisco.dnac.vlan: host: "{{ dnac_host }}"
username: "{{ dnac_username }}"password: "{{ dnac_password }}" validate_certs: no state: present vlan_name: "Engineering" vlan_id: 100 site_id: "{{ site_id }}" register: result
- debug: var=result
What is a potential issue with this playbook?
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 'site_id' parameter is mandatory for creating a VLAN in DNA Center; if missing, the task will fail.
The cisco.dnac.vlan module requires the 'site_id' parameter to associate the VLAN with a specific site. If the site_id is not provided or is incorrect, the task will fail or create the VLAN in the wrong location. Additionally, the playbook assumes the DNA Center credentials are correctly set.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
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 module name is incorrect; it should be cisco.dnac.network_vlan.
Why it's wrong here
The module cisco.dnac.vlan is valid for managing VLANs in DNA Center.
- ✗
The playbook does not include a task to obtain an authentication token, which is required by DNA Center API.
Why it's wrong here
The cisco.dnac collection modules handle authentication internally if host, username, and password are provided.
- ✓
The 'site_id' parameter is mandatory for creating a VLAN in DNA Center; if missing, the task will fail.
Why this is correct
Correct. DNA Center requires a site ID to associate the VLAN with a specific site. Without it, the API call will return an error.
Related concept
Access ports place end devices into a single VLAN.
- ✗
The 'state: present' is invalid; it should be 'state: create'.
Why it's wrong here
'state: present' is the correct parameter to ensure the VLAN exists. 'create' is not a valid state.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
- Access ports place end devices into a single VLAN.
- Trunk ports carry multiple VLANs between switches.
- Allowed VLAN lists decide which VLANs can cross a trunk.
- Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
- Use show vlan brief to verify access VLANs.
- Use show interfaces trunk to verify trunk state and allowed VLANs.
- Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
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.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-401 questions on switching, trunking, and access-port configuration.
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FAQ
Questions learners often ask
What does this 350-401 question test?
Cisco DNA Center — This question tests Cisco DNA Center — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: The 'site_id' parameter is mandatory for creating a VLAN in DNA Center; if missing, the task will fail. — The cisco.dnac.vlan module requires the 'site_id' parameter to associate the VLAN with a specific site. If the site_id is not provided or is incorrect, the task will fail or create the VLAN in the wrong location. Additionally, the playbook assumes the DNA Center credentials are correctly set.
What should I do if I get this 350-401 question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-401 questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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Last reviewed: Jun 18, 2026
This 350-401 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-401 exam.
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