200-901 Understanding and Using APIs Practice Test 2 — 15 Questions

Question 1

What is the correct Content-Type header value for a RESTCONF request using JSON encoding?

Accepted Answer

application/yang-data+json. RESTCONF uses application/yang-data+json for JSON and application/yang-data+xml for XML. application/json is not specific to YANG data.

Answer

application/json

Answer

text/json

Answer

application/xml

Question 2

Which TWO of the following are valid OAuth 2.0 grant types? (Select TWO)

Accepted Answer

Client credentials. Authorization code and client credentials are standard grant types. Basic is not OAuth 2.0. API key is a different authentication method. Implicit is deprecated.

Answer

API key

Answer

Basic authentication

Answer

Implicit grant

Question 3

Which THREE of the following are characteristics of NETCONF? (Select THREE)

Accepted Answer

Uses SSH as the transport protocol. NETCONF uses SSH for transport, XML-encoded RPCs, and operations like edit-config/get-config. It does not use HTTP or JSON, and it is not stateless.

Answer

Uses HTTP as the transport protocol

Answer

Supports JSON encoding for data

Question 4

Which TWO of the following are commonly used when implementing pagination in REST APIs? (Select TWO)

Accepted Answer

Cursor-based token in response. Offset/limit (or page/limit) and cursor-based pagination are common. Rate limiting is separate. OAuth is authentication. Webhooks are for events.

Answer

Rate limiting headers

Answer

OAuth 2.0 token

Answer

Webhook callback URL

Question 5

Which TWO of the following are HTTP methods used for creating or updating resources in REST APIs? (Select TWO)

Accepted Answer

PUT. In REST APIs, POST is used to create a new resource, and PUT is used to update or replace an existing resource (and can also create it if it doesn't exist). While PATCH can also update resources, it is not one of the two most fundamental methods for creating or updating, and the question specifically asks for only two.

Answer

DELETE

Answer

GET

Answer

PATCH

Question 6

An application needs to retrieve a list of network devices from Cisco DNA Center. Which HTTP method should be used against the /dna/intent/api/v1/network-device endpoint?

Accepted Answer

GET. GET is used to retrieve resources in REST APIs.

Answer

PUT

Answer

DELETE

Answer

POST

Question 7

A developer is making requests to the Meraki Dashboard API and receives a 429 Too Many Requests response. What is the default rate limit for this API?

Accepted Answer

5 requests per second. Meraki API rate limits at 5 requests per second per API key.

Answer

20 requests per second

Answer

10 requests per second

Answer

1 request per second

Question 8

In a RESTCONF API call to retrieve a specific interface configuration on a Cisco device, an engineer sends a GET request to /restconf/data/interfaces/interface=GigabitEthernet0/1. What Content-Type should be specified in the Accept header to receive YANG-defined JSON?

Accepted Answer

application/yang-data+json. RESTCONF uses application/yang-data+json for JSON encoding of YANG data.

Answer

text/plain

Answer

application/xml

Answer

application/json

Question 9

A Webex bot needs to receive real-time notifications when a new message is posted in a Webex space. Which Webex API feature should the bot implement?

Accepted Answer

Webhooks. Webhooks allow the bot to receive HTTP callbacks for events like message creation.

Answer

Long polling

Answer

Polling the messages API every second

Answer

Server-Sent Events

Question 10

A network automation script uses the Python ncclient library to modify a device configuration. Which NETCONF operation should be used to apply configuration changes?

Accepted Answer

. The operation is used to modify configuration in NETCONF.

Answer

<close-session>

Answer

<get-config>

Answer

<get>

Question 11

A developer is writing a Postman test to verify that a Meraki API response returns HTTP status 200 and contains a list of networks. Which code snippet correctly implements this test?

Accepted Answer

pm.test("Check networks", function() { pm.expect(pm.response.json()).to.have.property('networks'); pm.response.to.have.status(200); });. pm.test with pm.response.to.have.status and pm.expect checks the status and response body.

Answer

pm.response.to.have.status(200);

Answer

pm.test("Status 200", function() { pm.response.to.have.status(200); });

Answer

pm.test("Success", function() { pm.expect(pm.response.code).to.equal(200); });

Question 12

A Cisco Catalyst Center API uses OAuth 2.0 with the client credentials grant for server-to-server communication. Which token endpoint parameter should the client include to identify itself?

Accepted Answer

grant_type=client_credentials. In client credentials, the client sends client_id and client_secret (often as Basic auth or form parameters) to authenticate.

Answer

scope=admin

Answer

response_type=token

Answer

grant_type=authorization_code

Question 13

A developer needs to partially update a Meraki network's configuration, changing only the time zone. Which HTTP method should be used on the network resource?

Accepted Answer

PATCH. PATCH is used for partial updates in REST APIs.

Answer

PUT

Answer

DELETE

Answer

POST

Question 14

When using the Cisco DNA Center intent API to retrieve issues, the response includes a Link header with rel="next" and a URL. What type of pagination is this?

Accepted Answer

Cursor-based pagination via Link header. The Link header with rel="next" indicates cursor-based or link-based pagination.

Answer

Offset/limit pagination

Answer

Page-based pagination

Answer

No pagination

Question 15

A developer is implementing gRPC telemetry with dial-out streaming from a Cisco IOS XE device. Which component initiates the TCP connection to the collector?

Accepted Answer

The network device initiates the connection. In dial-out streaming, the network device (server) initiates the connection to the collector (client).

Answer

A third-party orchestrator initiates

Answer

The collector initiates the connection

Answer

Both initiate simultaneously