Match each API or programmability term to its most accurate meaning.
Drag a concept onto its matching description — or click a concept then click the description.
Centralized management or policy platform
Application-facing interface to the controller
Structured data format commonly used in API payloads
Credential-like value used to help control API access
⚠ Common exam trap
Learners often confuse 'Northbound API' with 'Southbound API' (controller-to-device interface). Focus on direction: Northbound faces applications, Southbound faces network devices.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Controller: Centralized management or policy platform
The 'Controller' is a centralized platform that manages network devices and enforces policies. The 'Northbound API' provides an interface for applications and users to interact with the controller. 'JSON' is a lightweight, structured data format commonly used to exchange data in API payloads. A 'Token' is a credential-like value used to authenticate and authorize API requests, ensuring secure access to the controller.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Controller: Centralized management or policy platform
Why this is correct
A software-defined networking (SDN) controller acts as the central brain of the network, separating the control plane from the data plane. It centralizes management, policy enforcement, and network state visibility, allowing administrators to define network behavior from a single logical point. This makes the option 'Centralized management or policy platform' the most accurate description of the controller's role.
Northbound API: Application-facing interface to the controller
Why this is correct
A northbound API is the interface exposed by an SDN controller to applications and orchestration tools, enabling them to request network services, query state, or push policies. Unlike southbound APIs that communicate with network devices, northbound APIs abstract underlying infrastructure details, typically using REST/JSON over HTTP. This application-facing orientation is why the option 'Application-facing interface to the controller' precisely defines it.
JSON: Structured data format commonly used in API payloads
Why this is correct
JSON (JavaScript Object Notation) is a lightweight, text-based data-interchange standard that structures information as key-value pairs and ordered lists. It is human-readable, language-independent, and widely used in REST API payloads for encoding requests and responses. As such, it perfectly matches the description 'Structured data format commonly used in API payloads' because it provides a hierarchical, parseable format for exchanging data between clients and controllers or devices.
Token: Credential-like value used to help control API access
Why this is correct
An API token is a string of characters that acts as a bearer credential, proving that the client has been authenticated and is authorized to perform specific actions. Tokens are typically issued by an authentication server (e.g., OAuth2) and sent in the Authorization header of HTTP requests to control access to API resources. This fits 'Credential-like value used to help control API access' because tokens function as temporary, revocable keys that gate API consumption without exposing username/password details.
Go deeper
Learn chapter
WLC and Lightweight APs
Key term
JSON
JSON is a lightweight, text-based format for storing and exchanging data that is easy for humans to read and write and easy for machines to parse and generate.
Key term
Interface
An interface is a point of connection or interaction between two systems, devices, or software components that allows them to exchange information or signals.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-301 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-301 exam.