This 200-901 practice question tests your understanding of infrastructure and automation. 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 wants to programmatically enable an interface using the YANG model shown. Which XPath expression correctly targets the 'shutdown' leaf for GigabitEthernet0/1?
//shut
Why wrong: Leaf name is shutdown, not shut.
/interfaces/GigabitEthernet[name='0/1']/shutdown
Correctly uses list instance selection.
/Cisco-IOS-XE-interface:interfaces/GigabitEthernet[0/1]/shutdown
Why wrong: Incorrect predicate syntax; should use key.
/native/interface/GigabitEthernet0/1/shutdown
Why wrong: Not matching the module structure.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
/interfaces/GigabitEthernet[name='0/1']/shutdown
Option B is correct because it uses the correct XPath syntax to target the 'shutdown' leaf under a specific GigabitEthernet interface instance. The path starts from the root, navigates to the 'interfaces' container, selects the 'GigabitEthernet' list entry where the 'name' key equals '0/1', and then accesses the 'shutdown' leaf. This matches the YANG model structure where list entries are filtered using a predicate with the key leaf.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
//shut
Why it's wrong here
Leaf name is shutdown, not shut.
/interfaces/GigabitEthernet[name='0/1']/shutdown
Why this is correct
Correctly uses list instance selection.
Related concept
Read the scenario before looking for a memorised answer.
/Cisco-IOS-XE-interface:interfaces/GigabitEthernet[0/1]/shutdown
Why it's wrong here
Incorrect predicate syntax; should use key.
/native/interface/GigabitEthernet0/1/shutdown
Why it's wrong here
Not matching the module structure.
Common exam traps
Cisco often tests the distinction between using a key-based predicate (e.g., [name='0/1']) versus a positional index (e.g., [0/1]) or a concatenated name (e.g., GigabitEthernet0/1), which are invalid in YANG XPath expressions.
Detailed technical explanation
In YANG, list entries are uniquely identified by their key leaves, and XPath predicates must reference these keys using the syntax [key='value']. The 'shutdown' leaf is a boolean that, when set to 'true', administratively disables the interface. In NETCONF, an XPath expression like /interfaces/GigabitEthernet[name='0/1']/shutdown is used in <get-config> or <edit-config> operations to target the specific leaf node. A common real-world scenario is automating interface configuration changes across many devices, where precise XPath targeting prevents unintended modifications to other interfaces.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
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FAQ
Infrastructure and Automation — This question tests Infrastructure and Automation — Read the scenario before looking for a memorised answer..
The correct answer is: /interfaces/GigabitEthernet[name='0/1']/shutdown — Option B is correct because it uses the correct XPath syntax to target the 'shutdown' leaf under a specific GigabitEthernet interface instance. The path starts from the root, navigates to the 'interfaces' container, selects the 'GigabitEthernet' list entry where the 'name' key equals '0/1', and then accesses the 'shutdown' leaf. This matches the YANG model structure where list entries are filtered using a predicate with the key leaf.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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