Question 1mediummulti select
Full question →mediummulti selectObjective-mapped
Exhibit
Snippet:
{
"hostname": "R1",
"enabled": true,
"vlans": [10,20,30]
}An engineer is comparing data serialization formats used by controllers and automation tools. Which two statements correctly describe JSON?
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
It represents data as key-value pairs and arrays
Objects and arrays are core JSON structures.
B
Best answer
It is commonly used in REST API payloads
JSON is the default payload format for many modern APIs.
C
Distractor review
It requires closing tags like XML
JSON does not use paired tags.
D
Distractor review
It can only represent numeric values
JSON supports strings, numbers, booleans, arrays, objects, and null.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is assuming JSON requires closing tags similar to XML, which is incorrect. JSON uses braces and brackets to define objects and arrays without paired tags, so confusing these formats can lead to wrong answers. Another common mistake is believing JSON only supports numeric values, ignoring that it also supports strings, booleans, null, arrays, and nested objects. Misunderstanding these details can cause candidates to incorrectly reject JSON as a serialization format in automation scenarios, especially when comparing it to XML or other data formats.
Technical deep dive
How to think about this question
JSON (JavaScript Object Notation) is a lightweight data-interchange format that represents data using key-value pairs and ordered arrays. It is text-based, easy to read and write, and language-independent, making it ideal for data serialization in network automation and programmability contexts. JSON structures include objects (enclosed in curly braces) and arrays (enclosed in square brackets), allowing flexible representation of complex data hierarchies commonly used in controller APIs and automation tools. In Cisco network automation, JSON is widely adopted as the default payload format for RESTful APIs, enabling seamless communication between network controllers and devices. Unlike XML, JSON does not use closing tags but relies on syntactic elements like braces and brackets to define data boundaries. This simplicity reduces parsing overhead and improves performance in automation workflows, making JSON preferable for exchanging configuration and telemetry data. A common exam trap is confusing JSON with XML due to their shared role in data serialization. JSON does not require closing tags or extensive markup, which often leads to the mistaken belief that it is limited to numeric data or that it uses paired tags like XML. Understanding JSON’s flexible data types and structure is critical for correctly interpreting automation tool outputs and API payloads in Cisco environments.
KKey Concepts to Remember
- JSON represents data using key-value pairs and ordered arrays, enabling flexible and hierarchical data structures.
- JSON is the default payload format for many REST APIs used in Cisco network automation and programmability workflows.
- JSON does not use closing tags like XML; it relies on braces and brackets to define objects and arrays.
- JSON supports multiple data types including strings, numbers, booleans, arrays, objects, and null values.
- Network automation tools and controllers commonly use JSON for efficient data serialization and parsing.
- Understanding JSON’s structure is critical for interpreting API responses and configuring automation scripts in Cisco environments.
- Confusing JSON with XML’s markup style can lead to incorrect assumptions about data format requirements.
- JSON’s lightweight and easy-to-parse nature improves performance in network programmability and automation tasks.
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 represents data using key-value pairs and ordered arrays, enabling flexible and hierarchical data structures.
What is the correct answer to this question?
The correct answer is: It represents data as key-value pairs and arrays — JSON is lightweight, easy to parse, and widely used in network automation workflows and controller APIs.
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.