Question 1easymultiple choice
Full question →- A
YANG
Why wrong: Distractor.
- B
JSON
Correct choice.
- C
STP
Why wrong: Distractor.
- D
TFTP
Why wrong: Distractor.
Question 1,870 of 1,819
Quick Answer
The answer is JSON, or JavaScript Object Notation, which is the most commonly used data format in REST APIs because it is lightweight and easy for applications to parse. JSON’s structure—key-value pairs and arrays—maps directly to data objects in most programming languages, making it both human-readable and efficient for machines to serialize and deserialize without heavy overhead. On the CCNA 200-301 v2 exam, this concept tests your understanding of controller-based networking and automation workflows, where REST APIs exchange JSON payloads for tasks like configuring devices via Cisco DNA Center or managing SD-WAN policies. A common trap is confusing JSON with XML, which is more verbose and requires more parsing resources, or assuming YAML is the default for REST—YAML is common in configuration files but less frequent in API request/response bodies. For a quick memory tip, remember that JSON is the “just enough” format: it strips unnecessary tags, keeping data compact and fast for RESTful transactions.
CCNA AI and Network Operations Practice Question
This 200-301 practice question tests your understanding of ai and network operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: jSON is a lightweight, text-based data format that represents data as key-value pairs and arrays, making it easy to parse and generate.. 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.
Which data format is most commonly used in REST APIs because it is lightweight and easy for applications to parse?
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
✓
JSON
JSON is widely used with REST because it is compact, human-readable, and easy for software to parse. It is common in controller APIs and automation workflows.
Key principle: JSON is a lightweight, text-based data format that represents data as key-value pairs and arrays, making it easy to parse and generate.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
YANG
Why it's wrong here
Distractor.
When this WOULD be correct
If the exam question asked for a data format used in network configuration protocols or data modeling languages, YANG would be the correct answer, as it is specifically designed for those purposes.
- ✓
JSON
Why this is correct
Correct choice.
Related concept
JSON is a lightweight, text-based data format that represents data as key-value pairs and arrays, making it easy to parse and generate.
- ✗
STP
Why it's wrong here
Distractor.
When this WOULD be correct
If the exam question asked about protocols used in network communications or data link layer technologies, STP could be the correct answer when discussing methods to manage network topology and prevent broadcast storms.
- ✗
TFTP
Why it's wrong here
Distractor.
When this WOULD be correct
If the exam question asked about protocols used for transferring files in a network environment, TFTP could be the correct answer. For example, a question could specify which protocol is best suited for simple file transfers in a low-overhead scenario.
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.
✓JSONCorrect answer▾
Why this is correct
Correct choice.
✗YANGWrong answer — click to see why▾
Why this is wrong here
YANG is a data modeling language used for defining data structures in network configurations, not a data format for REST APIs. It is not lightweight or designed for easy parsing by applications like JSON.
★ When this WOULD be the correct answer
If the exam question asked for a data format used in network configuration protocols or data modeling languages, YANG would be the correct answer, as it is specifically designed for those purposes.
Why candidates choose this
Candidates may confuse YANG with JSON due to their roles in data handling; they might recall YANG's relevance in network contexts and mistakenly associate it with REST API data formats.
✗STPWrong answer — click to see why▾
Why this is wrong here
C: STP (Spanning Tree Protocol) is a network protocol used for preventing loops in Ethernet networks, not a data format. It is unrelated to REST APIs and data interchange formats.
★ When this WOULD be the correct answer
If the exam question asked about protocols used in network communications or data link layer technologies, STP could be the correct answer when discussing methods to manage network topology and prevent broadcast storms.
Why candidates choose this
Candidates may confuse STP with data formats due to its acronym and association with network technologies, leading them to mistakenly believe it could relate to data interchange in APIs.
✗TFTPWrong answer — click to see why▾
Why this is wrong here
TFTP (Trivial File Transfer Protocol) is a protocol used for transferring files over a network, not a data format. It does not serve as a lightweight data interchange format like JSON in REST APIs.
★ When this WOULD be the correct answer
If the exam question asked about protocols used for transferring files in a network environment, TFTP could be the correct answer. For example, a question could specify which protocol is best suited for simple file transfers in a low-overhead scenario.
Why candidates choose this
Candidates might confuse TFTP with data formats due to its association with data transfer, leading them to mistakenly believe it relates to data interchange formats like JSON.
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
Common exam trap: answer the scenario, not the keyword
A common exam trap is selecting YANG as the data format for REST APIs because candidates recognize YANG as related to network automation. However, YANG is a data modeling language that defines the structure of data but does not represent the actual data format used in REST API communication. Confusing YANG with JSON leads to incorrect answers. Similarly, confusing protocols like STP or TFTP with data formats can mislead candidates. The key is to remember that JSON is the actual data format used in REST APIs due to its lightweight and easy-to-parse nature.
Detailed technical explanation
How to think about this question
JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It represents data as key-value pairs and arrays, making it highly flexible for representing complex data structures. In the context of REST APIs, JSON is the preferred format because it is text-based, compact, and language-independent, which facilitates communication between diverse systems and applications. REST APIs use HTTP methods to perform operations on resources, and JSON is commonly used as the payload format for these operations. Cisco network automation and programmability workflows leverage REST APIs with JSON to configure devices, retrieve operational data, and integrate with network controllers. The decision to use JSON over other formats like XML or YANG is based on its simplicity and widespread support in programming languages and network management tools. A common exam trap is confusing JSON with other network-related protocols or data models such as YANG, which is a data modeling language used in NETCONF and RESTCONF but not the actual data format for REST API payloads. JSON’s practical behavior in Cisco automation is to enable efficient parsing and generation of configuration and telemetry data, making it essential for candidates to distinguish JSON as the data format rather than a protocol or model.
KKey Concepts to Remember
- JSON is a lightweight, text-based data format that represents data as key-value pairs and arrays, making it easy to parse and generate.
- REST APIs commonly use JSON as the data format because it is compact, human-readable, and supported by most programming languages and network tools.
- Cisco network automation workflows use JSON-formatted REST API payloads to configure devices and retrieve operational data efficiently.
- YANG is a data modeling language used to define the structure of network configuration and state data but is not the data format used in REST API payloads.
- STP (Spanning Tree Protocol) is a Layer 2 protocol for preventing loops and is unrelated to data formatting in REST APIs.
- TFTP is a simple file transfer protocol used for transferring files like IOS images and is not a data format for REST APIs.
- Understanding the difference between data formats (JSON) and data models (YANG) is critical for correctly answering automation and programmability questions on the CCNA exam.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
JSON is a lightweight, text-based data format that represents data as key-value pairs and arrays, making it easy to parse and generate.
Real-world example
How this comes up in practice
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. JSON is a lightweight, text-based data format that represents data as key-value pairs and arrays, making it easy to parse and generate. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Review jSON is a lightweight, text-based data format that represents data as key-value pairs and arrays, making it easy to parse and generate., then practise related 200-301 questions on the same topic to reinforce the concept.
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AI and Network Operations — study guide chapter
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AI and Network Operations practice questions
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FAQ
Questions learners often ask
What does this 200-301 question test?
AI and Network Operations — This question tests AI and Network Operations — JSON is a lightweight, text-based data format that represents data as key-value pairs and arrays, making it easy to parse and generate..
What is the correct answer to this question?
The correct answer is: JSON — JSON is widely used with REST because it is compact, human-readable, and easy for software to parse. It is common in controller APIs and automation workflows.
What should I do if I get this 200-301 question wrong?
Review jSON is a lightweight, text-based data format that represents data as key-value pairs and arrays, making it easy to parse and generate., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
JSON is a lightweight, text-based data format that represents data as key-value pairs and arrays, making it easy to parse and generate.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on 200-301
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which data format is commonly used with REST APIs to represent objects, arrays, and key-value pairs?
easy- ✓ A.JSON
- B.STP
- C.EIGRP
- D.802.1Q
Why A: JSON is a common data-interchange format used in APIs and automation systems.
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Last reviewed: May 17, 2026
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