200-901 Practice Test 16 — 15 Questions

Question 1

Which Git command is used to create a new branch and switch to it in one step?

Accepted Answer

git checkout -b . The 'git checkout -b ' command creates a new branch and switches to it immediately.

Answer

git branch <branch>

Answer

git branch -d

Answer

git checkout

Question 2

A Python script uses the 'requests' library to make a POST request to create a new resource. Which HTTP status code indicates successful creation?

Accepted Answer

201 Created. According to the REST API conventions, a successful POST request returns status code 201 Created.

Answer

204 No Content

Answer

200 OK

Answer

301 Moved Permanently

Question 3

Which THREE of the following are benefits of using event-driven architecture in a distributed system? (Choose three.)

Accepted Answer

Loose coupling between services. Event-driven architecture promotes loose coupling, scalability, and real-time responsiveness.

Answer

Eliminates the need for message brokers

Answer

Simpler debugging due to synchronous communication

Question 4

A Webex API request returns a 401 Unauthorized error. The developer has already obtained an access token. What is the most likely cause?

Accepted Answer

Invalid access token or expired token. A 401 error typically indicates an invalid or expired token, or missing Authorization header.

Answer

Resource not found

Answer

Rate limit exceeded

Answer

Server internal error

Question 5

A developer is using the Webex API to create a webhook that triggers when a new message is posted in a room. What information is typically included in the webhook payload sent by Webex to the callback URL?

Accepted Answer

The resource type, event type, and relevant IDs (e.g., message ID, room ID). Webhook payloads contain event details such as resource, event type, and relevant data like message ID and room ID. The full message content is not included; the application must fetch it via API.

Answer

The full message content and all room members

Answer

The OAuth token for the bot

Answer

The complete list of webhooks configured on the account

Question 6

A developer needs to create a Python script that makes a GET request to a REST API to retrieve a list of network devices. The API uses query parameters to filter by device type and status. Which TWO code snippets correctly include query parameters using the requests library? (Choose two.)

Accepted Answer

requests.get('https://api.example.com/devices', params={'type': 'router', 'status': 'active'}). The params parameter accepts a dict; also can pass dict directly.

Answer

requests.get('https://api.example.com/devices', data={'type': 'router', 'status': 'active'})

Answer

requests.get('https://api.example.com/devices', json={'type': 'router', 'status': 'active'})

Answer

requests.get('https://api.example.com/devices', headers={'type': 'router', 'status': 'active'})

Question 7

A developer wants to use Postman to test a REST API that requires a Bearer token. Where should the token be placed in the request?

Accepted Answer

In the Authorization header. The Bearer token is placed in the Authorization header using the format 'Bearer <token>'. The request body is used for data, not authentication.

Answer

As a query parameter

Answer

In a custom header like X-Auth-Token

Answer

In the request body

Question 8

Which two authentication methods are commonly used with Cisco REST APIs? (Choose two.)

Accepted Answer

API key in header. API key and OAuth 2.0 are common; Basic auth is less common; session cookie and SAML are not typical for REST APIs.

Answer

Basic authentication with username/password

Answer

Session cookie

Answer

SAML assertion

Question 9

An IoT device streams telemetry data to a collector using gNMI. Which mode allows the collector to initiate the subscription?

Accepted Answer

Dial-in mode. In dial-in mode, the collector (client) initiates the gNMI subscription to the device (server).

Answer

gRPC streaming

Answer

Dial-out mode

Answer

NETCONF telemetry

Question 10

Which TWO authentication mechanisms are commonly used with Cisco REST APIs? (Choose two.)

Accepted Answer

API key. API key and OAuth 2.0 are the most common. Basic auth is less common now. Token-based is a subset of OAuth. Certificate-based is not typical for REST APIs.

Answer

Basic authentication (base64 encoded)

Answer

Certificate-based authentication

Answer

Token-based authentication (self-issued)

Question 11

What is the correct URL path for retrieving the configuration of a network interface using RESTCONF on a Cisco device?

Accepted Answer

/restconf/data/ietf-interfaces:interfaces. RESTCONF uses /restconf/data/ followed by the YANG module path. The standard path for interfaces is /restconf/data/ietf-interfaces:interfaces.

Answer

/restconf/data/interfaces

Answer

/api/restconf/data/interfaces

Answer

/restconf/operations/get-config

Question 12

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 13

A developer is using the Meraki Dashboard API and receives a 429 Too Many Requests error. The API documentation states a rate limit of 5 calls per second. What is the best practice to handle this?

Accepted Answer

Implement exponential backoff and honor the Retry-After header.. Implementing exponential backoff with retry-after headers is the recommended approach for rate-limited APIs. Ignoring or simply retrying immediately may worsen the situation.

Answer

Ignore the error and retry immediately.

Answer

Use a different API key to bypass the limit.

Answer

Increase the number of concurrent requests to exhaust the rate limit quickly.

Question 14

Which header is used to pass an API key in Meraki Dashboard API requests?

Accepted Answer

X-Cisco-Meraki-API-Key: <key>. Meraki API uses the X-Cisco-Meraki-API-Key header for authentication.

Answer

X-API-Key: <key>

Answer

Authorization: Bearer <token>

Answer

Authorization: Basic <base64>

Question 15

A developer is using Postman to test a Cisco Webex API that creates a room. After running the request, they want to verify that the response status is 200 and that the response body contains a non-null 'id' field. Which Postman test code accomplishes this?

Accepted Answer

pm.test('Status code is 200', () => { pm.response.to.have.status(200); }); pm.test('ID exists', () => { pm.expect(pm.response.json().id).to.not.be.null; });. pm.response.to.have.status checks the status; pm.expect and pm.response.json() access the body.

Answer

pm.response.to.have.status(200); if(pm.response.json().id) { console.log('exists'); }

Answer

pm.expect(pm.response.code).to.equal(200); pm.expect(pm.response.json().id).to.not.be.null;

Answer

pm.test('Status code is 200', () => { pm.response.to.have.status(200); }); pm.test('ID exists', () => { pm.expect(pm.response.json().id).to.be.null; });