CCNA AI and Network Operations Practice Test 12 — 15 Questions

Question 1

Match each API workflow concept to the description that best fits it.

Accepted Answer

REST is a stateless architectural style that uses standard HTTP methods and typically exchanges data in JSON or XML format.. Ly defines REST as a stateless architectural style using standard HTTP methods (GET, POST, PUT, DELETE) and typically exchanging data in JSON or XML. Option B is incorrect because SOAP uses XML, not JSON, and is not lightweight; it is a protocol with strict standards. Option C is incorrect because GraphQL is a query language, not a protocol requiring XML schemas; it allows clients to request specific data, often using JSON. Option D is incorrect because webhooks are callback-based push notifications triggered by events, not periodic polling.

Answer

SOAP is a lightweight protocol that uses JSON for data exchange and is commonly used in RESTful services.

Answer

GraphQL is a protocol that requires strict XML schemas and is used for real-time event notifications.

Answer

Webhooks are a method for polling servers at regular intervals to check for updates.

Question 2

A network engineer sends an HTTP GET request to a controller API and receives status code 401. What does that response indicate?

Accepted Answer

Authentication is required or the token is invalid. HTTP 401 means the request is not authorized because valid authentication credentials were not supplied or were rejected. In practice, this usually means the token is missing, expired, malformed, or otherwise invalid.

Answer

The API endpoint does not exist

Answer

The request was successful but returned an empty body

Answer

The server is overloaded and cannot process the request

Question 3

Match each automation term to the best description.

Accepted Answer

Playbook: A YAML file defining automation tasks in Ansible. In Ansible, a Playbook is a YAML file that defines automation tasks, making option A correct. A Module is a reusable unit of code that performs a specific task, such as managing files or installing software, matching option B. An Inventory is a list of managed nodes (hosts) that Ansible targets, aligning with option C. A Role is a structured way to group tasks, variables, and files for reuse, which corresponds to option D. These terms are central to Ansible automation and should not be confused with data modeling languages or APIs.

Question 4

Which data format is most commonly used in REST APIs because it is lightweight and easy for applications to parse?

Accepted Answer

JSON. JSON is widely used with REST because it is compact, human-readable, and easy for software to parse. It is common in controller APIs and automation workflows.

Answer

YANG

Answer

STP

Answer

TFTP

Question 5

Which data format uses key-value pairs and is commonly returned by REST APIs?

Accepted Answer

JSON. JSON is a lightweight, human-readable data format that uses key-value pairs and is the most common format returned by REST APIs. YANG is a data modeling language used for configuration and state data, not a data format. Syslog is a logging protocol used for system messages. CDP (Cisco Discovery Protocol) is a Layer 2 discovery protocol for Cisco devices. None of these are key-value pair data formats typically returned by REST APIs.

Answer

YANG

Answer

Syslog

Answer

CDP

Question 6

Match each HTTP method to the action it most commonly performs in a REST API.

Accepted Answer

GET: Retrieve a resource or collection of resources.. All listed mappings are correct according to RESTful API conventions. GET retrieves a resource, POST creates a new resource, PUT replaces an existing resource, and PATCH applies a partial update.

Question 7

An API call returns HTTP status code 401. What does that usually mean?

Accepted Answer

Authentication is required or the credentials are invalid. A 401 response means the request lacks valid authentication credentials. The token may be missing, expired, or invalid.

Answer

The resource was moved permanently

Answer

The request was successful but no content was returned

Answer

The server cannot parse JSON

Question 8

Which two statements accurately describe API authentication tokens? (Choose two.)

Accepted Answer

Tokens are often sent in an HTTP header such as Authorization. APIs often use tokens so clients can authenticate without sending usernames and passwords in every call. Tokens are commonly time-limited and are usually placed where the API expects them, such as an HTTP header.

Answer

Tokens are always permanent and never expire

Answer

Tokens require Telnet to be enabled on the device

Answer

A token changes JSON into XML automatically

Question 9

Exhibit: A script sends an HTTP GET request to a controller API endpoint. What is the usual purpose of the GET method?

Accepted Answer

Retrieve information from the resource. In REST-style APIs, GET is normally used to retrieve data from a resource. It is not the standard method for creating or replacing resources.

Answer

Create a brand-new resource

Answer

Replace the entire resource configuration

Answer

Delete the resource

Question 10

A network engineer queries a REST API and receives data in JSON format. Which statement about JSON is correct?

Accepted Answer

JSON stores data as key-value pairs and arrays. JSON is a lightweight data-interchange format that represents data as key-value pairs and arrays. Option A is incorrect because JSON is not a transport protocol; it is a data format exchanged over HTTPS. Option C is incorrect because JSON is platform-agnostic and used by many APIs, not limited to Cisco DNA Center. Option D is incorrect because JSON uses a flexible syntax with colons and brackets, not XML tags.

Answer

JSON is a transport protocol that replaces HTTPS

Answer

JSON can be used only with Cisco DNA Center

Answer

JSON requires XML tags around each object

Question 11

Exhibit: A controller returns an authentication token after a successful API login. Why does the client include that token in later requests?

Accepted Answer

To prove identity and authorization on later API calls. The token proves the client already authenticated and is authorized to use the API. It saves the client from resending credentials on every request and lets the server validate session or access scope.

Answer

To replace the need for an IP address on the client

Answer

To encrypt every packet at Layer 1

Answer

To change HTTP from a stateless protocol to a routing protocol

Question 12

Which HTTP method is normally used by a REST API client to retrieve data from a resource without changing it?

Accepted Answer

GET. GET requests read a resource. They are used to retrieve state or information without modifying the target object.

Answer

POST

Answer

PUT

Answer

DELETE

Question 13

An engineer receives API output that starts with curly braces and contains name-value pairs. Which data format is being used?

Accepted Answer

JSON. JSON represents data as objects and arrays using braces, brackets, and name-value pairs. It is the most common format you will see in modern network APIs.

Answer

YANG

Answer

Syslog

Answer

SMTP

Question 14

Exhibit: A script sends an API request and receives HTTP status code 401. What does that code indicate?

Accepted Answer

The client is not authenticated successfully. HTTP 401 means the request was not accepted because authentication is required or the provided credentials or token were invalid. In practice, the first thing to check is the token, username, password, or auth header format.

Answer

The requested resource was not found

Answer

The server completed the request successfully

Answer

The server rejected the request because the JSON body was too large

Question 15

Which two statements correctly describe a RESTful API used by network controllers? Choose two.

Accepted Answer

It commonly uses HTTP methods such as GET and POST. REST commonly uses HTTP methods such as GET, POST, PUT, PATCH, and DELETE. It is also stateless, which means each request includes the information needed for the server to process it.

Answer

It requires SNMP traps for every successful request

Answer

It can only return XML, never JSON