Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
Which statement best describes why a controller-based network platform benefits from northbound 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
They allow external applications and automation tools to interact with the controller.
This is correct because northbound APIs are application-facing interfaces.
B
Distractor review
They replace all need for wireless access points.
This is wrong because APIs do not replace the underlying infrastructure devices.
C
Distractor review
They are used only to elect STP root bridges.
This is wrong because STP root election is unrelated to northbound APIs.
D
Distractor review
They are the same thing as DHCP relay helpers.
This is wrong because API interfaces and DHCP relay are unrelated concepts.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is mistaking northbound APIs for physical network functions or device-level protocols. For example, some may incorrectly believe northbound APIs replace wireless access points or are involved in Spanning Tree Protocol root bridge elections. Another confusion is equating northbound APIs with DHCP relay helpers. These misconceptions arise because northbound APIs are software interfaces for external applications to communicate with the controller, not network infrastructure components or Layer 2/Layer 3 protocol mechanisms. Recognizing this distinction is crucial to avoid selecting incorrect answers that describe unrelated network functions.
Technical deep dive
How to think about this question
Northbound APIs are application-facing interfaces in a controller-based network architecture that allow external software to interact with the network controller. These APIs expose network state information and control functions, enabling applications to monitor, configure, and automate network behavior programmatically. This abstraction simplifies network management by providing a consistent interface regardless of underlying device specifics. The decision to use northbound APIs stems from the need to integrate network controllers with orchestration systems, dashboards, and automation frameworks. Unlike southbound APIs, which communicate directly with network devices using protocols like NETCONF or OpenFlow, northbound APIs serve as the bridge to higher-level software. This separation allows developers to build custom applications that can query network status or push configuration changes without dealing with device-level complexity. A common exam trap is confusing northbound APIs with unrelated network functions such as DHCP relay or STP root bridge election. Northbound APIs do not replace physical infrastructure components like wireless access points, nor do they participate in Layer 2 protocols. Practically, northbound APIs enable scalable automation and programmability by providing a structured interface for external tools to interact with the controller, which is critical for modern Cisco network environments.
KKey Concepts to Remember
- Northbound APIs provide a standardized interface that allows external applications and automation tools to communicate with the network controller.
- A controller-based network platform uses northbound APIs to enable programmability and automation by exposing network state and control functions to higher-level software.
- Northbound APIs differ from southbound APIs, as northbound interfaces face applications and orchestration systems, while southbound interfaces communicate with network devices.
- Northbound APIs support integration with dashboards, orchestration platforms, and custom scripts, enabling scalable network management and automation.
- Controller-based networks centralize control logic, and northbound APIs allow external systems to request configuration changes or retrieve network telemetry data.
- Northbound APIs do not replace physical network infrastructure such as wireless access points or switches; they only provide an interface for software interaction.
- Understanding the role of northbound APIs helps avoid confusing them with unrelated network functions like DHCP relay or STP root bridge election.
- Automation and programmability in Cisco networks rely heavily on northbound APIs to bridge the gap between network controllers and external management 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.
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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?
Northbound APIs provide a standardized interface that allows external applications and automation tools to communicate with the network controller.
What is the correct answer to this question?
The correct answer is: They allow external applications and automation tools to interact with the controller. — Northbound APIs are useful because they let external applications and automation tools interact with the controller in a structured way. In practical terms, they give dashboards, orchestration systems, and scripts a defined interface for reading state or requesting changes. That supports integration and automation at scale. The important distinction is that northbound APIs face applications, while other interfaces may face managed infrastructure.
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.
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