Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
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?
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
An array of objects
This is correct because a list of interfaces is commonly represented as objects inside an array.
B
Distractor review
A single scalar string only
This is wrong because one string is not a good structure for many interfaces with multiple fields.
C
Distractor review
A wildcard mask
This is wrong because wildcard masks are ACL-related, not JSON structures.
D
Distractor review
A route metric table
This is wrong because that is not a JSON structure type.
Common exam trap
Common exam trap: answer the scenario, not the keyword
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.
Technical deep dive
How to think about this question
JSON (JavaScript Object Notation) is a lightweight data-interchange format widely used in network automation and programmability to represent structured data. When a controller returns a list of interfaces, each interface typically has multiple attributes such as name, status, speed, and description. To represent this list, JSON uses an array, which is an ordered collection of items, where each item is an object containing key-value pairs for the interface attributes. The decision to use an array of objects is based on the need to represent multiple interfaces, each with its own set of properties. Arrays allow the controller to send a collection of interface objects, where each object can be parsed individually to extract relevant details. This structure is favored in Cisco network programmability because it aligns with REST API best practices and simplifies automation scripts that iterate over interfaces. A common exam trap is confusing JSON data structures with unrelated networking concepts like wildcard masks or route metric tables. Wildcard masks are used in ACLs for matching IP addresses and have no role in JSON formatting. Similarly, route metric tables describe routing decisions and are not data structures for interface lists. Understanding this distinction is essential for correctly interpreting API responses and avoiding mistakes during the CCNA exam and real-world automation tasks.
KKey Concepts to Remember
- A JSON array is the standard structure used to represent a list of similar items, such as network interfaces, in API responses.
- Each interface in a JSON array is represented as an object containing multiple fields like name and status to provide detailed information.
- Network automation and programmability rely on structured data formats like JSON arrays of objects to efficiently parse and manipulate interface data.
- A single scalar string cannot represent multiple interfaces with distinct attributes, making it unsuitable for detailed interface lists.
- Wildcard masks are specific to ACL configurations and do not represent data structures in JSON responses from network controllers.
- Route metric tables are conceptual routing data structures and are not JSON data types used to represent interface lists.
- Correctly identifying JSON structures helps network engineers automate device management and interpret API responses accurately.
- Understanding JSON arrays of objects is critical for working with Cisco DNA Center APIs and other network programmability tools.
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?
A JSON array is the standard structure used to represent a list of similar items, such as network interfaces, in API responses.
What is the correct answer to this question?
The correct answer is: 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.
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.