Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
Which statement best describes why JSON is common in controller APIs?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Because JSON is a lightweight structured format that is easy for software to exchange and parse
This is correct because JSON is popular in APIs for exactly that reason.
B
Distractor review
Because JSON automatically encrypts every API response
This is wrong because JSON is a data format, not encryption.
C
Distractor review
Because JSON replaces the need for HTTP methods
This is wrong because JSON often travels inside HTTP-based APIs.
D
Distractor review
Because JSON is required only for spanning-tree calculations
This is wrong because JSON is unrelated to STP calculations.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is assuming JSON provides encryption or security for API communications. Some candidates mistakenly believe JSON automatically secures data, but JSON is simply a data format without any encryption capabilities. Another common mistake is thinking JSON replaces HTTP methods like GET or POST; in reality, JSON is the payload format carried within HTTP requests and responses. Misunderstanding these roles can lead to incorrect answers about API behavior in Cisco network automation contexts.
Technical deep dive
How to think about this question
JSON, or 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 structured yet compact. In the context of network automation and programmability, JSON is widely used to encode data exchanged between network controllers, APIs, and automation tools because it simplifies data serialization and deserialization. Controller APIs use JSON because it provides a standardized, language-independent format that can be easily parsed by various programming languages and platforms. Unlike XML, JSON is less verbose, which reduces bandwidth usage and processing overhead. Cisco network devices and controllers often expose RESTful APIs that use HTTP methods to send and receive JSON-formatted data, enabling efficient communication for configuration, monitoring, and automation tasks. A common exam trap is confusing JSON with security features or network protocols. JSON itself does not provide encryption or replace HTTP methods; it is purely a data format. Understanding that JSON is a transport-neutral format used within APIs helps avoid this confusion. Practically, network engineers use JSON to interact with Cisco DNA Center, SDN controllers, and other automation platforms, where JSON payloads carry configuration commands or telemetry data.
KKey Concepts to Remember
- JSON provides a lightweight and structured format that simplifies data exchange between network controllers and automation tools.
- Controller APIs use JSON because it is easy for software systems to parse and generate, reducing processing overhead.
- JSON is a data serialization format and does not provide encryption or security features for API communications.
- HTTP methods like GET, POST, PUT, and DELETE carry JSON payloads in RESTful APIs used in Cisco network automation.
- Network automation platforms such as Cisco DNA Center commonly use JSON to represent configuration and telemetry data.
- JSON’s compact syntax reduces bandwidth usage compared to more verbose formats like XML in network programmability.
- Understanding JSON’s role as a data format helps avoid confusing it with transport protocols or security mechanisms.
- JSON enables interoperability across diverse programming languages and platforms in network automation environments.
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.
Related practice questions
Related 200-301 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
CCNA subnetting practice questions
Practise IPv4 subnetting, CIDR, masks, host ranges and subnet selection.
CCNA OSPF practice questions
Practise OSPF neighbours, router IDs, metrics, areas and routing-table interpretation.
CCNA VLAN practice questions
Practise VLANs, access ports, trunks, allowed VLANs and switching scenarios.
CCNA STP practice questions
Practise spanning tree, root bridge election, port roles and STP troubleshooting.
CCNA EtherChannel practice questions
Practise LACP, PAgP, port-channel behaviour and bundle requirements.
CCNA ACL practice questions
Practise standard and extended ACLs, permit/deny logic and traffic filtering.
CCNA NAT practice questions
Practise static NAT, dynamic NAT, PAT and inside/outside address translation.
CCNA DHCP practice questions
Practise DHCP scopes, relay, leases and troubleshooting.
CCNA show ip route practice questions
Practise routing-table output, longest-prefix match, AD and route selection.
CCNA show interfaces trunk practice questions
Practise trunk verification and VLAN forwarding across switches.
CCNA wireless security practice questions
Practise WLAN security, authentication and wireless architecture concepts.
CCNA IPv6 practice questions
Practise IPv6 addressing, routes, neighbour discovery and common IPv6 exam traps.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?
Question 2
A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?
Question 3
What is the OSPF metric called?
Question 4
A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?
Question 5
A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?
Question 6
A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?
FAQ
Questions learners often ask
What does this 200-301 question test?
JSON provides a lightweight and structured format that simplifies data exchange between network controllers and automation tools.
What is the correct answer to this question?
The correct answer is: Because JSON is a lightweight structured format that is easy for software to exchange and parse — JSON is common because it is lightweight, structured, and relatively easy for software systems to parse and generate. In plain language, it gives applications a compact way to exchange organized data. That makes it practical for controllers, dashboards, automation tools, and APIs that need to send structured information frequently. It is a data format, not an encryption mechanism or routing protocol.
What should I do if I get this 200-301 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
Discussion
Loading comments…
Sign in to join the discussion.