200-901 Software Development and Design Practice Question
This 200-901 practice question tests your understanding of software development and design. 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 is automating the deployment of new branch offices using Cisco DNA Center REST API. The script creates a new site under a parent site using the POST /dna/intent/api/v1/site API endpoint. The script runs successfully but when checking the DNA Center UI, the new site appears under the incorrect parent site. The script uses the following JSON payload:
The parentId is obtained from a GET request to /dna/intent/api/v1/site that returns a list of all sites. The engineer verified that the parentId matches the UUID of a site named 'HQ', which the engineer believes is an area. However, 'HQ' is actually a building site. The engineer is not aware that the site type is different because the GET response does not display the type field prominently. What is the most likely cause of the new site being placed under the wrong parent?
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.
The type field is set to 'area' but the parent site is of type 'building'
The site hierarchy does not allow an area directly under a building. The API may fall back to a different parent, causing the site to appear under the incorrect parent.
B
The script is using the wrong API endpoint for creating sites
Why wrong: POST /dna/intent/api/v1/site is the correct endpoint for creating sites.
C
The API is ignoring the parentId because the request is missing the 'siteId' header
Why wrong: There is no 'siteId' header required for the site creation API.
D
The script is not including the 'address' field which is required for site creation
Why wrong: The 'address' field is not required for creating an area site.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The type field is set to 'area' but the parent site is of type 'building'
Option B is correct because the parent site 'HQ' is of type 'building', but the request is trying to create an 'area' under it. In Cisco DNA Center, the site hierarchy requires that an area cannot be directly under a building; areas can only be under Global or another area. The API may silently place the new area under the root or another compatible parent, resulting in the wrong parent. Option A is incorrect because the endpoint is correct. Option C is incorrect because there is no 'siteId' header requirement for site creation. Option D is incorrect because the 'address' field is not required for creating an area.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 type field is set to 'area' but the parent site is of type 'building'
Why this is correct
The site hierarchy does not allow an area directly under a building. The API may fall back to a different parent, causing the site to appear under the incorrect parent.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
The script is using the wrong API endpoint for creating sites
Why it's wrong here
POST /dna/intent/api/v1/site is the correct endpoint for creating sites.
✗
The API is ignoring the parentId because the request is missing the 'siteId' header
Why it's wrong here
There is no 'siteId' header required for the site creation API.
✗
The script is not including the 'address' field which is required for site creation
Why it's wrong here
The 'address' field is not required for creating an area site.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 200-901 OSPF questions on adjacency and route selection.
Software Development and Design — This question tests Software Development and Design — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The type field is set to 'area' but the parent site is of type 'building' — Option B is correct because the parent site 'HQ' is of type 'building', but the request is trying to create an 'area' under it. In Cisco DNA Center, the site hierarchy requires that an area cannot be directly under a building; areas can only be under Global or another area. The API may silently place the new area under the root or another compatible parent, resulting in the wrong parent. Option A is incorrect because the endpoint is correct. Option C is incorrect because there is no 'siteId' header requirement for site creation. Option D is incorrect because the 'address' field is not required for creating an area.
What should I do if I get this 200-901 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 200-901 OSPF questions on adjacency and route selection.
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?
OSPF neighbours must agree on key parameters.
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