Quick Answer
The correct answer is that interfaces is a JSON array containing two objects. This is because the value assigned to interfaces is enclosed in square brackets, which is the defining syntax for a JSON array, and each element within those brackets is a separate JSON object enclosed in curly braces. In contrast, the device element is a JSON object, as it is wrapped in curly braces and holds key-value pairs like hostname and interfaces. On the CCNA 200-301 v2 exam, this question tests your ability to parse JSON data structures used in REST API responses for network automation, a key topic under Automation and Programmability. A common trap is confusing an array of objects with a nested object—remember that arrays use brackets [] and objects use braces {}. Memory tip: think of an array as a list of items, each of which can be an object, just like a shopping list where each item has its own details.
This 200-301 practice question tests your understanding of network services and security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. A key principle to apply: a JSON object uses curly braces to group related key-value pairs representing a single entity or configuration block.. 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.
Based on the JSON snippet below, which statement is correct?
{
"device": {
"hostname": "R1",
"interfaces": [
{"name": "Gig0/0", "status": "up"},
{"name": "Gig0/1", "status": "down"}
]
}
}interfaces is a JSON array containing two objects.
Square brackets indicate an array, and each entry inside is an object.
device is a JSON array.
Why wrong: device is enclosed in braces, so it is an object.
status is a JSON array with two strings.
Why wrong: Each status value is a simple string inside an object.
hostname is a nested array under interfaces.
Why wrong: hostname is a string field inside the device object.
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 is a JSON array containing two objects.
The value associated with interfaces is an array because it is enclosed in square brackets and contains multiple objects. The device element itself is an object, and each interface entry inside the array is also an object.
Key principle: A JSON object uses curly braces to group related key-value pairs representing a single entity or configuration block.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
interfaces is a JSON array containing two objects.
Why this is correct
Square brackets indicate an array, and each entry inside is an object.
Related concept
A JSON object uses curly braces to group related key-value pairs representing a single entity or configuration block.
device is a JSON array.
Why it's wrong here
device is enclosed in braces, so it is an object.
When this WOULD be correct
If the question were to present a JSON structure where 'device' was defined as an array of multiple objects, such as [{...}, {...}], then stating 'device is a JSON array' would be correct. For example, if the JSON snippet contained multiple devices, each represented as an object within an array.
status is a JSON array with two strings.
Why it's wrong here
Each status value is a simple string inside an object.
When this WOULD be correct
This option would be correct if the JSON structure was modified to include 'status' as an array, such as: 'status': ['up', 'down']. A question could ask about the structure of a JSON object where 'status' is explicitly defined as an array.
hostname is a nested array under interfaces.
Why it's wrong here
hostname is a string field inside the device object.
When this WOULD be correct
In a different question setup where the JSON structure was modified to include 'hostname' as an object within each interface, such as: { 'interfaces': [ { 'hostname': 'R1', 'status': 'up' }, { 'hostname': 'R2', 'status': 'down' } ] }, option D would be correct as 'hostname' would then be a nested key under 'interfaces'.
Option-by-option analysis
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.
Why this is correct
Square brackets indicate an array, and each entry inside is an object.
Why this is wrong here
This option is wrong because 'device' is a JSON object, not an array. A JSON array is defined by square brackets, while an object is defined by curly braces.
★ When this WOULD be the correct answer
If the question were to present a JSON structure where 'device' was defined as an array of multiple objects, such as [{...}, {...}], then stating 'device is a JSON array' would be correct. For example, if the JSON snippet contained multiple devices, each represented as an object within an array.
Why candidates choose this
Candidates may confuse the structure of JSON objects and arrays, leading them to mistakenly identify 'device' as an array due to its complex nested structure.
Why this is wrong here
This option is wrong because 'status' is a key in the JSON object that holds a string value for each interface, not an array. The correct interpretation is that each interface object has a single status string.
★ When this WOULD be the correct answer
This option would be correct if the JSON structure was modified to include 'status' as an array, such as: 'status': ['up', 'down']. A question could ask about the structure of a JSON object where 'status' is explicitly defined as an array.
Why candidates choose this
Candidates may be tempted by this option due to a misunderstanding of JSON structures, confusing the representation of multiple values with arrays instead of recognizing the key-value pair format.
Why this is wrong here
This option is incorrect because 'hostname' is a key at the top level of the JSON object, not nested under 'interfaces'. The 'interfaces' key contains an array of objects, but 'hostname' is not part of that structure.
★ When this WOULD be the correct answer
In a different question setup where the JSON structure was modified to include 'hostname' as an object within each interface, such as: { 'interfaces': [ { 'hostname': 'R1', 'status': 'up' }, { 'hostname': 'R2', 'status': 'down' } ] }, option D would be correct as 'hostname' would then be a nested key under 'interfaces'.
Why candidates choose this
Candidates might be tempted by this option due to a misunderstanding of JSON structure, confusing the hierarchical relationships between keys and arrays, leading them to incorrectly assume 'hostname' could be nested within 'interfaces'.
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?”
Common exam traps
A frequent exam trap is misidentifying the JSON structure by assuming that "interfaces" is an object rather than an array. Since "interfaces" contains multiple entries, it must be an array, indicated by square brackets. Another pitfall is thinking "device" is an array because it contains multiple keys, but it is actually an object enclosed in curly braces. Misreading "status" as an array of strings instead of a string value inside each interface object can also cause confusion. These mistakes stem from not carefully noting the JSON syntax, which is critical for understanding device data representation in Cisco automation and APIs.
Detailed technical explanation
JSON (JavaScript Object Notation) is a lightweight data-interchange format widely used in network device configurations and APIs, including Cisco devices. It represents data as key-value pairs within objects (curly braces) and arrays (square brackets). In this snippet, the "device" is a JSON object containing a "hostname" string and an "interfaces" array. Each element in the "interfaces" array is itself an object describing an interface's name and status, reflecting how network devices often represent interface states programmatically. Understanding the structure of JSON is crucial for interpreting device configurations and automation scripts in Cisco networking. The "interfaces" key holds an array because it lists multiple interface objects, each with properties like "name" and "status." This array format allows Cisco automation tools and APIs to process multiple interfaces efficiently. The "device" key is an object because it groups related properties, such as hostname and interfaces, under a single entity, mirroring how Cisco IOS groups device-level settings. A common exam trap is confusing arrays with objects or misinterpreting nested structures. For example, mistaking "interfaces" as an object instead of an array leads to misunderstanding how multiple interfaces are represented. Practically, Cisco network engineers use JSON arrays to handle multiple interfaces or ACL entries, making it essential to recognize arrays by square brackets and objects by curly braces. This distinction impacts how configurations are parsed and applied in automation and scripting contexts.
Key takeaway
A JSON object uses curly braces to group related key-value pairs representing a single entity or configuration block.
Real-world example
A practitioner preparing for the 200-301 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. A JSON object uses curly braces to group related key-value pairs representing a single entity or configuration block. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Review a JSON object uses curly braces to group related key-value pairs representing a single entity or configuration block., then practise related 200-301 questions on the same topic to reinforce the concept.
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FAQ
Network Services and Security — This question tests Network Services and Security — A JSON object uses curly braces to group related key-value pairs representing a single entity or configuration block..
The correct answer is: interfaces is a JSON array containing two objects. — The value associated with interfaces is an array because it is enclosed in square brackets and contains multiple objects. The device element itself is an object, and each interface entry inside the array is also an object.
Review a JSON object uses curly braces to group related key-value pairs representing a single entity or configuration block., then practise related 200-301 questions on the same topic to reinforce the concept.
A JSON object uses curly braces to group related key-value pairs representing a single entity or configuration block.
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Last reviewed: May 17, 2026
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