200-901 Understanding and Using APIs Practice Question
This 200-901 practice question tests your understanding of understanding and using apis. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Exhibit
Router# show running-config | section router ospf
router ospf 1
network 10.1.1.0 0.0.0.255 area 0
network 192.168.1.0 0.0.0.255 area 1
Refer to the exhibit. A DevOps engineer is using NETCONF to retrieve the OSPF configuration. The <get> response is missing the network statements. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The filter used in the NETCONF request did not include the correct path for network commands.
The most likely cause is that the NETCONF <get> request used an incorrect or incomplete XML filter that did not specify the correct XPath for the OSPF network statements. NETCONF relies on YANG-defined data paths; if the filter omits the subtree for network commands, the device will not return those configuration elements, even though they exist in the running configuration.
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.
✓
The filter used in the NETCONF request did not include the correct path for network commands.
Why this is correct
If the filter subtree does not include the network list, the response will not contain those statements.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The YANG model for OSPF does not include the network statement.
Why it's wrong here
The YANG model for OSPF does include network statements.
The NETCONF username does not have sufficient privileges.
Why it's wrong here
Insufficient privileges would typically cause an access-denied error, not missing data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the nuance that NETCONF filters are not automatically recursive; candidates mistakenly assume that requesting a parent container returns all child elements, but the filter must explicitly include the desired subtree path.
Detailed technical explanation
How to think about this question
NETCONF uses YANG-defined data models to structure configuration and operational data. When a filter is applied in a <get> operation, the device returns only the nodes that match the filter's XPath expression. If the filter specifies only the top-level OSPF container (e.g., /ospf) without including the network subtree (e.g., /ospf/areas/area/network), the device will omit those child nodes. This is a common pitfall when engineers assume the filter will return all descendants by default—NETCONF filters are explicit, not recursive unless the filter uses wildcards or the 'select' attribute with 'descendant-or-self'.
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 network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
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.
Understanding and Using APIs — This question tests Understanding and Using APIs — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The filter used in the NETCONF request did not include the correct path for network commands. — The most likely cause is that the NETCONF <get> request used an incorrect or incomplete XML filter that did not specify the correct XPath for the OSPF network statements. NETCONF relies on YANG-defined data paths; if the filter omits the subtree for network commands, the device will not return those configuration elements, even though they exist in the running configuration.
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.
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?
Read the scenario before looking for a memorised answer.
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Question Discussion
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