200-901 Infrastructure and Automation Practice Question
Network Topology
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?
⚠ Common exam trap
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.
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
✓
/interfaces/GigabitEthernet[name='0/1']/shutdown
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.
Answer analysis
Option-by-option breakdown
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.
- ✗
/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.
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