200-901 Practice Test 49 — 15 Questions

Question 1

In a microservices architecture, which of the following is a key characteristic compared to a monolithic architecture?

Accepted Answer

Services communicate via lightweight protocols such as HTTP/REST.. Microservices are independently deployable, scalable, and developed by small teams, whereas a monolith is a single deployable unit.

Answer

Changes require rebuilding the entire application.

Answer

The entire application is deployed as a single unit.

Answer

All services share the same database.

Question 2

Which TWO HTTP status codes indicate client errors?

Accepted Answer

404 Not Found. 400 Bad Request and 404 Not Found are both client error statuses (4xx).

Answer

500 Internal Server Error

Answer

200 OK

Answer

201 Created

Question 3

What is the output of the following code?

my_list = [1, 2, 3]
for i in range(len(my_list)):
    my_list[i] += 1
print(my_list)

Accepted Answer

[2, 3, 4]. The code modifies each element by adding 1. So [1,2,3] becomes [2,3,4].

Answer

[1, 2, 3, 1]

Answer

[1, 2, 3]

Answer

Error

Question 4

A developer uses the requests library to call an API. The API returns 429 Too Many Requests. What is the best practice to handle this?

Accepted Answer

Use exponential backoff and retry. Implement retry with exponential backoff to respect rate limiting.

Answer

Ignore the status code and proceed

Answer

Immediately retry the request

Answer

Wait a fixed amount of time and retry

Question 5

A developer is building a chatbot that retrieves interface status from a Cisco Catalyst 9000 switch using RESTCONF. Which authentication method is most appropriate for programmatic access?

Accepted Answer

HTTP Basic Authentication over HTTPS.. RESTCONF on Cisco Catalyst 9000 switches supports HTTP Basic Authentication over HTTPS as a straightforward, standards-based method for programmatic access. Basic authentication sends the username and password in the HTTP Authorization header, and when combined with HTTPS, the credentials are encrypted in transit, providing adequate security for device management without requiring additional infrastructure like an OAuth provider or certificate authority.

Answer

API key passed in the HTTP header.

Answer

OAuth 2.0 with client credentials grant.

Answer

Client certificate authentication.

Question 6

In a Postman collection, a developer stores the base URL of a Meraki API as a variable. Which Postman feature allows this?

Accepted Answer

Environments. Environments allow defining variables like base_url that can be reused across requests.

Answer

Tests

Answer

Pre-request Scripts

Answer

Collections

Question 7

When using RESTCONF to configure a network device, which URL path prefix and content-type header should be used?

Accepted Answer

/restconf/data/ and Content-Type: application/yang-data+json. RESTCONF uses /restconf/data/ and content-type application/yang-data+json.

Answer

/restconf/operations/ and Content-Type: application/xml

Answer

/restconf/data/ and Content-Type: application/json

Answer

/restconf/ and Content-Type: text/plain

Question 8

A developer is working with a REST API that uses HTTP Basic Authentication. The developer needs to send a request with the username 'admin' and password 'secret'. Which HTTP header should be set?

Accepted Answer

Authorization: Basic YWRtaW46c2VjcmV0. HTTP Basic Authentication requires the credentials to be formatted as 'username:password', then Base64-encoded, and sent in the Authorization header with the 'Basic' scheme. Option C correctly includes the 'Basic' scheme followed by the Base64-encoded string 'YWRtaW46c2VjcmV0' (which decodes to 'admin:secret').

Answer

Authorization: Basic admin:secret

Answer

Authorization: YWRtaW46c2VjcmV0

Answer

Authorization: Bearer YWRtaW46c2VjcmV0

Question 9

A developer uses RESTCONF to configure a network device. What is the correct content-type header to send in the request?

Accepted Answer

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

Answer

application/json

Answer

application/xml

Answer

text/plain

Question 10

In the context of Cisco Webex APIs, which mechanism allows an application to receive real-time notifications when a message is created in a space?

Accepted Answer

Registering a webhook with the resource 'messages' and event 'created'. Webex uses webhooks to send HTTP callbacks for events like message creation.

Answer

Enabling Server-Sent Events (SSE)

Answer

Polling the /messages endpoint every second

Answer

Using a long-lived HTTP connection

Question 11

Which HTTP method is used to partially update an existing resource in a RESTful API?

Accepted Answer

PATCH. PATCH is used for partial updates; PUT replaces the entire resource.

Answer

UPDATE

Answer

POST

Answer

PUT

Question 12

Which THREE of the following are characteristics of RESTCONF compared to NETCONF? (Select three.)

Accepted Answer

Uses HTTP as the transport protocol. RESTCONF uses HTTP and supports JSON encoding, while NETCONF uses SSH and XML RPCs. Both use YANG data models.

Answer

Employs XML Remote Procedure Calls (RPCs)

Answer

Uses SSH for secure transport

Question 13

What is the purpose of the Authorization header in a REST API call?

Accepted Answer

To authenticate the client sending the request. The Authorization header carries credentials (e.g., Bearer token) to authenticate the client.

Answer

To specify the content type of the request body

Answer

To specify the format of the response body

Answer

To indicate the desired language

Question 14

A developer is using gRPC/gNMI for model-driven telemetry from a Cisco device. Which of the following best describes the difference between dial-in and dial-out streaming?

Accepted Answer

Dial-in is initiated by the collector; dial-out is initiated by the device.. In gNMI, dial-in is when the collector initiates the subscription to the device; dial-out is when the device pushes data to the collector.

Answer

Dial-in uses gNMI; dial-out uses NETCONF.

Answer

Dial-in uses TCP; dial-out uses UDP.

Answer

Dial-in is initiated by the network device; dial-out is initiated by the collector.

Question 15

Which pagination method uses a 'Link' header with 'rel="next"' to indicate the next page of results?

Accepted Answer

Cursor-based pagination with Link header. The Link header with rel="next" is used by the Meraki Dashboard API and others for cursor-based pagination.

Answer

Offset/limit pagination

Answer

Page-based pagination

Answer

Token-based pagination