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 Cisco DevNet engineer is configuring model-driven telemetry on a Cisco IOS-XE device. The telemetry subscription includes the following path: 'Cisco-IOS-XE-native:native/interface/GigabitEthernet[Name='1/0/1']/ip/address'. Which part of this path identifies a specific list instance?
Cisco-IOS-XE-native
Why wrong: This is the module namespace, not a list instance.
[Name='1/0/1']
This specifies the key value to identify the particular interface instance.
GigabitEthernet
Why wrong: This is the list node name, not the instance.
ip/address
Why wrong: This is a leaf path under the instance, not the instance identifier.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
[Name='1/0/1']
Option B is correct because the XPath expression `[Name='1/0/1']` is a predicate filter that selects a specific list instance from the `GigabitEthernet` YANG list. In YANG model-driven telemetry, list keys are used to identify individual entries, and the predicate syntax `[key='value']` pinpoints exactly one instance within the list.
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.
Cisco-IOS-XE-native
Why it's wrong here
This is the module namespace, not a list instance.
[Name='1/0/1']
Why this is correct
This specifies the key value to identify the particular interface instance.
Related concept
Read the scenario before looking for a memorised answer.
GigabitEthernet
Why it's wrong here
This is the list node name, not the instance.
ip/address
Why it's wrong here
This is a leaf path under the instance, not the instance identifier.
Common exam traps
Cisco often tests whether candidates confuse the YANG module name or the list node name with the list instance identifier, leading them to pick the module or the list name instead of the key predicate.
Detailed technical explanation
In YANG, a list is defined with one or more `key` leafs; for `Cisco-IOS-XE-native:native/interface/GigabitEthernet`, the key is typically `name`. The predicate `[Name='1/0/1']` is an XPath filter that matches only the list entry where the `name` leaf equals `'1/0/1'`. Under the hood, the telemetry encoder (e.g., gRPC or NETCONF) uses this predicate to subscribe to state changes for that single interface, reducing bandwidth and processing overhead compared to subscribing to the entire list.
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.
What to study next
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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: [Name='1/0/1'] — Option B is correct because the XPath expression `[Name='1/0/1']` is a predicate filter that selects a specific list instance from the `GigabitEthernet` YANG list. In YANG model-driven telemetry, list keys are used to identify individual entries, and the predicate syntax `[key='value']` pinpoints exactly one instance within the list.
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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