200-901 Infrastructure and Automation Practice Question
This 200-901 practice question tests your understanding of infrastructure and automation. 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.
Which TWO of the following are characteristics of the YANG data modeling language that make it suitable for network automation? (Select two)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
YANG defines data types and constraints
Option A is correct because YANG is a data modeling language that defines the structure, syntax, and semantics of configuration and state data, including explicit data types (e.g., string, uint32) and constraints (e.g., range, pattern, mandatory). This strict typing and validation ensure that network devices receive well-formed data, reducing errors in automation workflows.
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.
✓
YANG defines data types and constraints
Why this is correct
YANG provides a type system and constraints to ensure data validity.
Related concept
Read the scenario before looking for a memorised answer.
✗
YANG is human-readable only
Why it's wrong here
YANG is both human-readable and machine-readable.
✗
YANG is a markup language like XML
Why it's wrong here
YANG is a modeling language, not a markup language.
✗
YANG supports both configuration and operational state data
Why it's wrong here
This is true but not a unique characteristic; the key is its use with protocols.
✓
YANG can be used with NETCONF and RESTCONF
Why this is correct
YANG models are transported via NETCONF and RESTCONF.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between a data modeling language (YANG) and a serialization format (XML/JSON), so candidates mistakenly select 'YANG is a markup language like XML' because they associate YANG with XML-based NETCONF messages.
Detailed technical explanation
How to think about this question
YANG models are defined in RFC 6020 and RFC 7950, and they use a tree-like structure with 'leaf', 'list', and 'container' nodes. The 'type' statement enforces data constraints at the model level, which NETCONF and RESTCONF servers validate before applying changes, preventing misconfigurations. In real-world automation, a YANG model can define an interface MTU as 'type uint32 { range 68..9216; }', ensuring that any automation script sending an out-of-range value is rejected immediately.
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Infrastructure and Automation — This question tests Infrastructure and Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: YANG defines data types and constraints — Option A is correct because YANG is a data modeling language that defines the structure, syntax, and semantics of configuration and state data, including explicit data types (e.g., string, uint32) and constraints (e.g., range, pattern, mandatory). This strict typing and validation ensure that network devices receive well-formed data, reducing errors in automation workflows.
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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