CCNA AI and Network Operations — 20 Questions

Question 1

Which statement best contrasts YAML with JSON?

Accepted Answer

YAML is commonly more human-readable, while JSON is widely used in APIs. YAML is often chosen because it is relatively easy for humans to read and edit. JSON is also readable but is especially common in API payloads and programmatic data exchange.

Answer

YAML can represent only arrays, while JSON can represent only strings

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JSON requires indentation but YAML requires curly braces

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YAML is a routing protocol and JSON is an access method

Question 2

Which statement accurately describes JSON?

Accepted Answer

It represents data with key-value pairs and arrays. JSON is a lightweight data-interchange format that commonly represents information using objects made of key-value pairs and arrays. It is widely used in APIs and automation workflows.

Answer

It uses angle brackets to define nested elements

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It is a routing protocol for controller communication

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It can be parsed only by Cisco devices

Question 3

What is the role of a YANG model in network programmability?

Accepted Answer

It provides a structured way to model configuration and state data. YANG is a data modeling language used to define structured representations of configuration and operational data. Protocols such as NETCONF and RESTCONF can use those models to read or manipulate network state.

Answer

It encrypts API payloads between a client and server

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It replaces JSON as a transport protocol

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It assigns VLAN IDs dynamically to trunks

Question 4

What is the main benefit of using a data model such as YANG in network automation?

Accepted Answer

It defines structured data that tools can validate and manipulate consistently.. YANG provides a structured, consistent way to define configuration and operational data, which improves automation reliability.

Answer

It eliminates the need for IP addressing on managed devices.

Answer

It replaces TLS for secure API transport.

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It forces all devices to run the same operating system.

Question 5

What is the most likely purpose of a GET request in a RESTful network API?

Accepted Answer

To retrieve data from the server. GET is typically used to retrieve information rather than create or modify it.

Answer

To delete a resource permanently

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To create a new resource with a request body

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To encrypt the API session automatically

Question 6

Which statement best describes YANG in the context of network programmability?

Accepted Answer

YANG is a data modeling language for structured network information. YANG is a data modeling language used to describe the structure of network configuration and operational data. In plain language, it defines how information should be organized so systems and tools can exchange it consistently. That makes it valuable in programmable networking because devices, controllers, and management systems can work from a shared model instead of inventing incompatible structures.

YANG is not a transport protocol, not a cable type, and not a VLAN feature. It belongs to the data-model side of automation and programmability. CCNA questions usually do not expect detailed model-writing ability, but they do expect recognition that YANG helps standardize how network information is represented for automated systems.

Answer

YANG is the encrypted replacement for SSH

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YANG is a trunk encapsulation method

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YANG is an STP election field

Question 7

Which statement best describes an API token in a network automation workflow?

Accepted Answer

A value used to authenticate or authorize API access. An API token is typically a credential or credential-like value used to authenticate or authorize software access to an API. In plain language, it acts like a key that allows a script, application, or automation tool to prove it has permission to talk to the system. This is important because modern automation often depends on secure machine-to-machine access rather than manual interactive logins.

A token is not a routing metric, not a VLAN identifier, and not a physical connection property. It belongs to the security and access-control side of automation. CCNA-level questions usually do not expect deep application-security design, but they do expect recognition that API interactions often need protected credentials or tokens instead of anonymous access.

Answer

A special OSPF metric for controller traffic

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A trunking field used to carry multiple VLANs

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A duplex mode required for REST APIs

Question 8

Which statement best describes the relationship between REST and HTTP methods such as GET and POST?

Accepted Answer

REST commonly uses HTTP methods such as GET and POST to represent actions in API interactions. REST commonly uses standard HTTP methods as part of its interaction model. In plain language, a REST-style API often relies on verbs like GET, POST, PUT, and DELETE to indicate whether the client is reading information, creating something, updating something, or removing something. That is why CCNA automation questions often present REST and HTTP verbs together.

This does not mean REST is the same thing as HTTP itself, but HTTP methods are widely used in RESTful API designs.

Answer

REST requires every request to use only TFTP

Answer

GET and POST are OSPF packet types

Answer

REST replaces all need for authentication

Question 9

Which statement best describes why JSON is common in controller APIs?

Accepted Answer

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.

Answer

Because JSON automatically encrypts every API response

Answer

Because JSON replaces the need for HTTP methods

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Because JSON is required only for spanning-tree calculations

Question 10

Which statement best explains why APIs are useful in controller-based networking?

Accepted Answer

They allow external software to interact with the controller in a defined, programmatic way. APIs are useful because they let external software interact with the controller programmatically. In plain language, that means a dashboard, script, automation tool, or orchestration platform can request information or trigger changes without a human manually performing every step.

This is one of the main reasons controller-based designs fit so naturally with automation.

Answer

They replace all need for forwarding devices

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They are used only for Ethernet duplex negotiation

Answer

They make authentication unnecessary

Question 11

Which statement best describes HTTPS in network automation contexts?

Accepted Answer

HTTPS provides encrypted transport commonly used for secure API communication. HTTPS is the secure transport commonly used for web-based and API communication. In plain language, it allows automation tools, controllers, and scripts to exchange information over HTTP while protecting the traffic with encryption. That is important because API interactions may carry credentials, tokens, device state, or configuration details that should not be exposed in clear text.

This does not make HTTPS a data format or a routing protocol. It is a secure transport choice. That is why the correct answer is the one focused on protected API and web communication.

Answer

HTTPS is a structured data format like JSON

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HTTPS is the default metric used by OSPF

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HTTPS is the VLAN used for secure management traffic

Question 12

Which statement best describes why a token might be used in an API request instead of sending a username and password with every request?

Accepted Answer

A token can provide a controlled way to authenticate or authorize API access without sending raw credentials every time.. A token can be used because it provides a more controlled and often more practical way to authorize or authenticate repeated API access without exposing raw credentials in every interaction. In plain language, the system can issue a token that the client presents on later requests, which can simplify automation workflows and improve security handling. This does not mean tokens remove the need for security; they are part of how secure API access is often managed.

This is increasingly common in controller and automation environments. The correct answer is the one that recognizes tokens as an access-control mechanism for API interaction rather than as a routing or VLAN concept.

Answer

A token is the IPv4 subnet mask for controller traffic.

Answer

A token is the STP root bridge identifier.

Answer

A token forces the API to use Telnet.

Question 13

Which statement best describes the difference between a controller and a northbound API?

Accepted Answer

The controller is the central management platform, and the northbound API is the application-facing interface to it.. A controller is the central platform that manages policy or coordinates network behavior, while a northbound API is one of the interfaces that external software uses to communicate with that controller. In plain language, the controller is the system, and the northbound API is the doorway that applications use to talk to it.

This distinction matters because controller-based architecture includes both the control platform and the interfaces around it. The correct answer is the one that preserves that relationship instead of confusing the platform with the API itself.

Answer

They are the same thing and can always be used interchangeably.

Answer

A northbound API is the physical cable used between two controllers.

Answer

A controller exists only to replace IPv6 addressing.

Question 14

What is the main reason a controller API might return data in JSON rather than plain unstructured text?

Accepted Answer

Because JSON provides structured data that software can parse consistently. JSON is preferred because it provides a structured, machine-readable format that software can parse consistently. In plain language, unstructured text may be easy for a human to glance at, but it is harder for applications to process reliably. JSON gives the response a predictable structure of keys, values, objects, and arrays that scripts and tools can understand more easily.

This is one of the main reasons JSON is so common in modern APIs. The correct answer is the one focused on machine readability and structured exchange rather than on encryption or routing behavior.

Answer

Because JSON automatically supplies IP addressing to hosts

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Because JSON replaces all authentication requirements

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Because JSON is required for STP convergence

Question 15

Which statement best describes why JSON is often easier for software tools to work with than unstructured text?

Accepted Answer

Because JSON provides predictable structure that software can parse more consistently than free-form text.. JSON is easier for software tools because it is structured and predictable. In plain language, a script can reliably look for keys, arrays, and objects instead of trying to guess meaning from loose, human-oriented text. That makes JSON especially useful for APIs, controllers, dashboards, and automation tools that need to parse data consistently.

The point is not that humans can never read JSON, but that software can process it more safely and repeatably than free-form text. The correct answer is the one focused on structure and machine readability.

Answer

Because JSON automatically configures the router’s default gateway.

Answer

Because JSON replaces HTTPS completely.

Answer

Because JSON is required for STP to elect a root bridge.

Question 16

Which statement best describes the role of a token in an API-based workflow?

Accepted Answer

A token is a value used to help authenticate or authorize API requests.. A token is a credential-like value used to help control access to the API. In plain language, the client presents the token so the system can determine whether the request should be accepted, often without resending the raw username and password every time. This makes repeated programmatic access more practical while still fitting into an access-control model.

A token is not a VLAN concept, a routing metric, or a transport protocol. The correct answer is the one centered on access control for API interaction.

Answer

A token is the OSPF cost of the controller link.

Answer

A token is the native VLAN for secure traffic.

Answer

A token replaces the need for HTTPS.

Question 17

Which statement best describes the purpose of HTTPS in controller-based API communication?

Accepted Answer

It provides encrypted transport for API requests and responses.. HTTPS provides encrypted transport for API communication. In plain language, it protects data such as tokens, credentials, requests, and responses while they cross the network. This matters because controller APIs often carry sensitive operational and configuration information that should not be exposed in clear text.

HTTPS is not the same thing as JSON or the controller itself. The correct answer is the one focused on secure transport.

Answer

It is the data format used inside every API payload.

Answer

It replaces authentication and authorization entirely.

Answer

It is the routing protocol used by the controller.

Question 18

Which statement best describes why APIs are useful in controller-based networking?

Accepted Answer

They provide a defined interface through which software can retrieve data or request changes.. APIs are useful because they provide a defined software interface for tools and applications to retrieve data or request changes. In practical terms, that means dashboards, orchestration systems, and scripts can interact with the controller in a predictable way. This is much more automation-friendly than relying entirely on manual, device-by-device operation.

At the CCNA level, the key idea is not deep programming theory. It is that APIs make controlled software interaction possible. That is why they matter in controller-based environments.

Answer

They replace all forwarding devices in the network.

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They remove the need for authentication and authorization.

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They are the same thing as switch trunks.

Question 19

Which statement best describes why tokens are commonly used in API-based workflows?

Accepted Answer

They provide a controlled way for clients to authenticate or authorize repeated API access.. Tokens are commonly used because they let clients present a controlled access value instead of sending raw credentials repeatedly with every request. In practical terms, that makes repeated software-driven interaction more manageable while still fitting into an authentication and authorization model.

This does not mean tokens replace transport security or remove the need for access control. It means they are a common mechanism for managing API access in a practical way.

Answer

They eliminate the need for HTTPS entirely.

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They are the same thing as router metrics.

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They turn API data into VLAN tags.

Question 20

Which statement best explains why JSON is often easier for software tools to process than free-form text?

Accepted Answer

Because JSON provides structured data with predictable fields that software can parse consistently.. JSON is easier for software tools to process because it has predictable structure. In practical terms, the tool can look for keys, values, objects, and arrays instead of trying to infer meaning from loose human-oriented wording. That makes parsing more reliable and repeatable.

This is one of the reasons JSON is so common in APIs. It is about machine readability, not about encryption or routing.

Answer

Because JSON automatically authenticates the API client.

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Because free-form text cannot be read by humans.

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Because JSON replaces HTTPS.