CCNA AI and Network Operations Practice Test 10 — 15 Questions

Question 1

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 2

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 3

Match each HTTP method to the most common API action.

Accepted Answer

GET: Retrieve a resource. These are the standard HTTP methods and their typical CRUD actions in RESTful APIs.

Question 4

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 5

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 6

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

Question 7

A network engineer is reviewing REST API behavior. Which two statements are true?

Accepted Answer

GET is commonly used to retrieve information from an API. GET is used to retrieve data without changing server state, while POST commonly creates a new resource or submits data for processing. PUT is usually for full replacement, and DELETE removes a resource.

Answer

DELETE is used to encrypt a payload before transport

Answer

PUT always retrieves a list of resources

Answer

GET requires a token in every API design

Question 8

Which two statements about YANG are correct?

Accepted Answer

It defines structured models for configuration and state data. YANG is a data modeling language used to describe configuration and operational state. It is commonly used with NETCONF and RESTCONF, but it is not itself the transport protocol.

Answer

It is a replacement for OSPF adjacency formation

Answer

It is the same thing as JSON syntax

Answer

It automatically discovers neighbors on a LAN

Question 9

Which term describes a string or credential passed to an API to prove the client is allowed to access a resource?

Accepted Answer

Token. A token is commonly used for API authorization. It is often included in an HTTP header and lets the server verify the caller has permission.

Answer

Metric

Answer

Lease

Answer

Tuple

Question 10

Match each data format or API term to its best description.

Accepted Answer

JSON. JSON, XML, and YAML are data formats; REST is an architectural style that commonly uses HTTP methods, while SOAP and gRPC are API protocols. Each has distinct characteristics: JSON is lightweight, XML is verbose, YAML is human-readable, REST uses HTTP verbs, SOAP is strict, and gRPC is high-performance.

Answer

XML

Answer

REST

Answer

SOAP

Question 11

Which two statements correctly describe JSON?

Accepted Answer

It commonly represents data as key-value pairs. JSON is a lightweight data-interchange format commonly used in APIs. It represents data using key-value pairs and arrays. It is not the same as XML, which uses angle-bracket tags. JSON is not a routing protocol. JSON can carry various data types including strings, numbers, booleans, arrays, objects, and null, not only integers.

Answer

It requires angle-bracket tags around every field

Answer

It is a routing protocol used by controllers

Answer

It can only carry integer values

Question 12

A controller exposes a YANG-modeled interface configuration through an API. Which two statements correctly describe the purpose of YANG in that workflow?

Accepted Answer

It provides a structured data model for configuration and operational data. YANG is a modeling language. It defines the structure of network data so controllers and devices can exchange information consistently through APIs such as RESTCONF or NETCONF.

Answer

It replaces IP addressing on routed interfaces

Answer

It is a spanning-tree optimization mechanism

Question 13

An engineer is comparing data serialization formats used by controllers and automation tools. Which two statements correctly describe JSON?

Accepted Answer

It represents data as key-value pairs and arrays. Option A is correct because JSON structures data using key-value pairs (objects) and ordered lists (arrays), which are fundamental to its syntax. Option B is correct as JSON is the standard payload format for REST API requests and responses due to its lightweight nature and ease of parsing. Option C is incorrect because JSON does not use closing tags; instead, it relies on curly braces {} for objects and square brackets [] for arrays. Option D is incorrect because JSON supports multiple data types beyond numeric values, including strings, booleans, null, arrays, and nested objects.

Answer

It requires closing tags like XML

Answer

It can only represent numeric values

Question 14

A developer is interacting with a REST API exposed by a network controller. Which two statements correctly describe common REST behavior?

Accepted Answer

GET is commonly used to retrieve resource data. REST APIs commonly use HTTP methods such as GET, POST, PUT, and DELETE, and JSON is one of the most common payload formats.

Answer

POST always replaces an existing resource completely

Answer

REST requires SNMP as the transport mechanism

Question 15

A script authenticates to a controller API and receives a token that it presents in later requests. Which two statements about that token-based workflow are correct?

Accepted Answer

The token is often sent in an HTTP header in subsequent requests. After authentication, many APIs issue a token that the client includes in later HTTP requests. That token acts as proof that the client already authenticated successfully.

Answer

The token changes the API from REST to SNMP

Answer

The token must be stored in the router startup-config