CCNA AI and Network Operations Practice Question
A JSON response from a controller contains a list of interfaces, each with its own name and status fields. Which JSON structure is most likely used to represent that list?
⚠ Common exam trap
A frequent exam trap is mistaking the JSON structure for unrelated networking concepts such as wildcard masks or route metric tables. Candidates might incorrectly select these options because they recognize the terms from routing or ACL topics, but these are not JSON data structures. Another trap is assuming a single scalar string can represent multiple interfaces, which ignores the need for multiple fields per interface. Recognizing that an array of objects is the natural and standard way to represent a list of interfaces with multiple attributes helps avoid these pitfalls.
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 of objects
The most likely structure is an array containing objects. In practical terms, an array is the natural way to represent a list of similar items, and each item can then be an object with named fields such as name and status. This is a very common pattern in API payloads. The question is testing structure recognition, not programming syntax mastery.
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 of objects
Why this is correct
An array of objects is the correct JSON structure for a list of interfaces. In JSON, an array (delimited by square brackets) holds an ordered collection of values, and each interface is best modeled as an object with key-value pairs for attributes like name, IP, and status. This allows the controller to return multiple interfaces in a single response, where each object is independently parseable and extensible.
- ✗
A single scalar string only
Why it's wrong here
A single scalar string holds only one text value, such as "GigabitEthernet0/1", and cannot represent the multiple attributes and multiple interfaces returned by a controller. Even if JSON array syntax were used, a string does not support key-value pairs or nested fields, making it impossible to convey status, MAC address, or MTU per interface. Thus, a scalar string is fundamentally inadequate for structured interface data.
When this WOULD be correct
If the exam question asked for a JSON representation of a single interface's status, where only the name of the interface is needed as a string, then a single scalar string would be the correct answer.
- ✗
A wildcard mask
Why it's wrong here
A wildcard mask is an ACL or routing concept (e.g., 0.0.0.255) used to match address ranges, not a JSON data structure. JSON has no representation for wildcard masks as a type; masks are values within a configuration object, not a wrapper for a list. The question is about serialized data from a controller, so a wildcard mask is irrelevant to how interfaces are encoded in JSON.
When this WOULD be correct
If the question asked about configuring access control lists (ACLs) in a networking context, where a wildcard mask is needed to define which IP addresses are permitted or denied access, then this option would be correct.
- ✗
A route metric table
Why it's wrong here
A route metric table is a conceptual routing-protocol construct, such as hop count or composite cost, not a JSON data type. JSON only defines primitives (string, number, boolean, null), objects, and arrays; there is no native 'table' structure. While you could encode a table as an array of objects, the question specifically asks for the JSON representation of an interface list, not routing metrics.
When this WOULD be correct
If the exam question asked about the representation of routing information in a network configuration context, where a route metric table is used to display metrics for various routes, this option would be correct.
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 of objectsCorrect answer▾
Why this is correct
An array of objects is the correct JSON structure for a list of interfaces. In JSON, an array (delimited by square brackets) holds an ordered collection of values, and each interface is best modeled as an object with key-value pairs for attributes like name, IP, and status. This allows the controller to return multiple interfaces in a single response, where each object is independently parseable and extensible.
✗A single scalar string onlyWrong answer — click to see why▾
Why this is wrong here
A single scalar string can only hold one value, such as a single interface name or status. It cannot represent multiple interfaces or multiple fields per interface, making it unsuitable for a list of interfaces with name and status fields.
★ When this WOULD be the correct answer
If the exam question asked for a JSON representation of a single interface's status, where only the name of the interface is needed as a string, then a single scalar string would be the correct answer.
Why candidates choose this
Students might think a simple string could represent a list if they are unfamiliar with JSON data types, or they might confuse it with a single interface response where only one interface is returned.
✗A wildcard maskWrong answer — click to see why▾
Why this is wrong here
A wildcard mask is a networking concept used in ACLs and routing protocols (e.g., OSPF) to match IP addresses, not a JSON data structure. It has no relevance to representing a list of interfaces in JSON.
★ When this WOULD be the correct answer
If the question asked about configuring access control lists (ACLs) in a networking context, where a wildcard mask is needed to define which IP addresses are permitted or denied access, then this option would be correct.
Why candidates choose this
Students might associate 'wildcard' with flexibility or pattern matching, and incorrectly think it could represent a list of varying interfaces. The term 'mask' might also be confused with data representation.
✗A route metric tableWrong answer — click to see why▾
Why this is wrong here
A route metric table is a routing concept (e.g., administrative distance, cost) and not a JSON structure. JSON structures are limited to objects, arrays, strings, numbers, booleans, and null.
★ When this WOULD be the correct answer
If the exam question asked about the representation of routing information in a network configuration context, where a route metric table is used to display metrics for various routes, this option would be correct.
Why candidates choose this
Students might think 'table' implies a structured list, and 'route metric' sounds technical, leading them to believe it could be a valid JSON representation for interface data.
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?”
Visual reference
Go deeper
Related to this question
Learn chapter
Network Management Approaches: Device, Cloud, Controller, Automation, and IaC
Key term
JSON
JSON is a lightweight, text-based format for storing and exchanging data that is easy for humans to read and write and easy for machines to parse and generate.
Key term
CAN
A CAN (Controller Area Network) is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other without a host computer.
About these practice questions
Courseiva writes every 200-301 question from scratch — 1,389 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
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.