CCNA AI and Network Operations Practice Question
An API response returns a list of interface objects in JSON. Which structure most likely represents that list?
⚠ Common exam trap
Remember that arrays in JSON are denoted by square brackets, and each item should be a complete object if details are needed.
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
✓
An array containing multiple interface objects
In JSON, a list is most naturally represented as an array. In plain language, when an API needs to return several interfaces, routes, VLANs, or similar repeated items, it usually places them inside square brackets as an ordered collection. Each item inside that array might itself be an object containing keys such as name, status, or IP address. CCNA automation questions usually test whether you recognize that square brackets signal a list. If the response contains many similar interface records, the best structure is the one that looks like a JSON array of interface objects rather than a single scalar value.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
An array containing multiple interface objects
Why this is correct
An array containing multiple interface objects is the correct representation because JSON arrays are explicitly designed to hold an ordered collection of repeated items, with each element separated by a comma and enclosed in square brackets. In a REST API response, a list of interfaces is naturally modeled as an array where each element is a JSON object containing key-value pairs such as interface name, status, and IP address. This directly matches the request for a list of interface objects, making it the appropriate structure for the response.
- ✗
A single integer with the value 1
Why it's wrong here
A single integer with the value 1 is incorrect because it is a JSON primitive, which can only represent a numeric scalar value and cannot hold multiple structured interface objects. Unlike an array, a primitive has no capacity to include nested key-value pairs or multiple entries. While an interface object might have a numeric property like "portNumber": 1, the overall response containing a list of interfaces must be an array, not a lone integer.
When this WOULD be correct
If the exam question asked for the response of an API that simply returns a status code or a numeric value indicating success or failure, then a single integer could be the correct answer. For example, 'What does the API return when a request is successful?' could lead to this option being correct.
- ✗
A native VLAN field
Why it's wrong here
A native VLAN field is incorrect because it represents a Layer 2 switching concept, specifically the VLAN assigned to untagged traffic on an 802.1Q trunk port. In a JSON response, a native VLAN would appear as a single scalar property like "nativeVlan": 10 within an interface object, not as the top-level container for a collection of interface objects. A list structure requires an array or an object, not a single switching attribute, so this does not satisfy the requirement of returning multiple interface objects.
When this WOULD be correct
In a question asking for the representation of VLAN configurations in a network device's JSON output, where the native VLAN is being queried, this option could be correct if the question specifically asks for a single VLAN identifier.
- ✗
An STP root bridge ID
Why it's wrong here
An STP root bridge ID is incorrect because it is a spanning tree protocol parameter, comprising a bridge priority and a MAC address, used to elect the root switch in a Layer 2 network. This value is unrelated to the JSON representation of a list of interface objects and would itself be a small, structured field within a larger object, not a collection. A list of interfaces returned by an API would not be encapsulated as a root bridge ID, as that protocol identifier has no relation to the data being transferred.
When this WOULD be correct
In a different question that asks for the identification of a specific attribute within a JSON object related to network topology, such as 'What identifies the root bridge in a spanning tree configuration?', option D would be the correct answer.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓An array containing multiple interface objectsCorrect answer▾
Why this is correct
An array containing multiple interface objects is the correct representation because JSON arrays are explicitly designed to hold an ordered collection of repeated items, with each element separated by a comma and enclosed in square brackets. In a REST API response, a list of interfaces is naturally modeled as an array where each element is a JSON object containing key-value pairs such as interface name, status, and IP address. This directly matches the request for a list of interface objects, making it the appropriate structure for the response.
✗A single integer with the value 1Wrong answer — click to see why▾
Why this is wrong here
Option B is incorrect because an API response that returns a list of interface objects should be structured as an array, not as a single integer. A single integer does not represent a collection of objects.
★ When this WOULD be the correct answer
If the exam question asked for the response of an API that simply returns a status code or a numeric value indicating success or failure, then a single integer could be the correct answer. For example, 'What does the API return when a request is successful?' could lead to this option being correct.
Why candidates choose this
Candidates may find this option tempting because they might confuse the concept of an API response with a simple status code or numeric indicator, which can sometimes be part of API interactions, leading to misinterpretation of the question's requirements.
✗A native VLAN fieldWrong answer — click to see why▾
Why this is wrong here
A native VLAN field is not a valid representation of a list of interface objects in JSON; it typically refers to a specific VLAN configuration in networking, not an array structure.
★ When this WOULD be the correct answer
In a question asking for the representation of VLAN configurations in a network device's JSON output, where the native VLAN is being queried, this option could be correct if the question specifically asks for a single VLAN identifier.
Why candidates choose this
Candidates may confuse the concept of VLANs with API responses, mistakenly thinking that VLAN-related fields could represent a list of interfaces, especially if they have encountered similar terms in networking contexts.
✗An STP root bridge IDWrong answer — click to see why▾
Why this is wrong here
Option D is incorrect because an STP root bridge ID is a specific identifier related to Spanning Tree Protocol, not a representation of a list of interface objects in JSON format.
★ When this WOULD be the correct answer
In a different question that asks for the identification of a specific attribute within a JSON object related to network topology, such as 'What identifies the root bridge in a spanning tree configuration?', option D would be the correct answer.
Why candidates choose this
Candidates may choose this option due to familiarity with networking concepts, mistakenly believing that any network-related term could be relevant to JSON structures, leading to confusion between different data types.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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Key term
Interface
An interface is a point of connection or interaction between two systems, devices, or software components that allows them to exchange information or signals.
Key term
Cisco Discovery Protocol
A proprietary Layer 2 network protocol used by Cisco devices to discover information about directly connected neighbor devices.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-301 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-301 exam.