Quiz about Devnet-100

Question 1

1 Which two concepts describe test-driven development? (Choose two.)

Accepted Answer

It enables code refactoring.

Accepted Answer

Write a test before writing code

Answer

User acceptance testers develop the test requirements.

Answer

Tests are created when code is ready for release

Answer

Implementation is driven by incremental testing of release candidates

Question 2

A developer is attempting to retrieve all the messages from a Cisco Webex space. The server responds by sending the first 1,000 messages. The developer must make additional requests to retrieve the rest of the messages. Which API constraint is described in this scenario?

Accepted Answer

pagination

Answer

payload limiting

Answer

throttling

Answer

rate limiting

Question 3

Question 3.

Accepted Answer

Option A is correct

Answer

h

Question 4

Question 4.

Accepted Answer

Option A is correct

Answer

h

Question 5

Question 5.

Accepted Answer

Option A is correct

Answer

H

Question 6

Question 6.

Accepted Answer

Option A is correct

Answer

h

Question 7

Refer to the exhibit. An engineer writes a Python script that uses two different API calls to query Cisco DNA Center for the number of interfaces on a device. The engineer notices that the two API calls produce different results. Why are fewer interfaces returned for the same device when the 'get_all_interfaces' API call is used?

Accepted Answer

pagination

Answer

times out

Answer

rate limit

Answer

invalid password

Question 8

A developer creates a web application that receives a username and password and uses them to sync the credentials to other services through HTTPS. API keys to services are part of the configuration files of the application, but the credentials to the database that stores the synchronization logs are obtained through an external vault service. What is the security issue in this scenario?

Accepted Answer

Communication between the application and the services is not encrypted.

Answer

The database credentials should be stored in the configuration files so that they are secured on the same server.

Answer

The API keys are stored in the configuration files but should be stored in the vault service

Answer

The synchronization logs should be encrypted and not stored in a relational database

Question 9

Which HTTP code group is issued when a request is received successfully, understood, and processed?

Accepted Answer

2xx

Answer

3xx

Answer

4xx

Answer

5xx

Question 10

Which REST architectural constraint indicates that no client context should be stored on the server between requests?

Accepted Answer

stateless

Answer

cacheable

Answer

uniform interface

Answer

client-server

Question 11

Refer to the exhibit. The script returns an output of 401. To use the supplied URL, an HTTP GET request must be sent with an Authorization header. The header value is a base64 encoded concatenation of the username and password. Which action must be taken to return an output of 200?

Accepted Answer

Modify the method from LOGIN to GET and supply the username:password value as JSON payload.

Answer

Change the verify=False setting in the request to verify=True to enable HTTP Basic authentication.

Answer

Verify that the username and password values imported from the configuration file are still valid.

Answer

Insert an Authorization header with the values username:password from the supplied configuration file.

Question 12

In Python, which expression checks whether the script returns a success status code when the Requests library is used?

Accepted Answer

response.status_code == requests.codes.ok

Answer

response.code == requests.codes.ok

Answer

response.status_code == requests.ok

Answer

response.status_code != requests.codes.ok

Question 13

Question 13.

Accepted Answer

Option A is correct

Answer

h

Question 14

Question 14.

Accepted Answer

Option A is correct

Answer

f

Question 15

Question 15.

Accepted Answer

Option B is correct

Answer

A.

Answer

C.

Answer

D.

Question 16

Refer to the exhibit. Which command needs to be placed on the box where the code is missing to output the value of page_id in the Python 3.7 script?

Accepted Answer

print(items.get('items').get('page_id'))

Answer

print(items.get('items')[0].get('page_id'))

Answer

print(items['items']['page_id'].keys())

Answer

print(items['items']['page_id'])

Question 17

Refer to the exhibit. A network engineer must manage the network devices. The engineer prepares a Python script to authenticate to the Cisco DNA Center API and request a device list. The device request fails and returns error code 401. Which action solves the problem?

Accepted Answer

Send the Authentication header in the request with a valid configuration

Answer

Update the credentials that are already supplied and retry the request.

Answer

Send the request to another network in case there are reachability issues.

Answer

Update the API URL, which matched the API endpoint for device list

Question 18

Refer to the exhibit. Drag and drop the code from the bottom onto the blanks in the code to construct a cURL command using the Cisco DNA Center API, which will provide the details of a WLAN controller with Id ab123456789. Not all options are used.Select and Place:

Accepted Answer

Option A is correct

Answer

h

Question 19

What is a difference between a synchronous API and an asynchronous API?

Accepted Answer

Synchronous API calls are returned immediately while asynchronous calls do not guarantee an immediate response.

Answer

Synchronous API calls require an authentication header to be sent while asynchronous calls do not require authentication.

Answer

An asynchronous API can make offline calls while synchronous APIs do not have this capability.

Answer

An asynchronous API can make a larger number of calls in a specified time period than a synchronous API.

Question 20

Question 20.

Accepted Answer

Option B is correct

Answer

A.

Question 21

Which API is used to obtain data about voicemail ports?

Accepted Answer

. Cisco Unified Communications Manager

Answer

Webex Teams

Answer

. Finesse Gadgets

Answer

Webex Devices

Question 22

Which two use cases are supported by Meraki APIs? (Choose two.)

Accepted Answer

Configure network devices via the Dashboard API.

Answer

Build location-aware apps from Wi-Fi and LoRaWAN devices.

Answer

Build a custom Captive Portal for Mobile Apps.

Answer

Deploy applications onto the devices.

Answer

Retrieve live streams from a Meraki Camera.

Question 23

What caused the error in this API request?

Accepted Answer

The submitted JSON payload has a formatting issue.

Answer

The API resource does not support the POST operation.

Answer

The API resource does not support JSON format payloads.

Answer

The submitted JSON payload includes a field that is not supported by the API resource.

Question 24

Which mechanism is used to consume a RESTful API design when large amounts of data are returned?

Accepted Answer

pagination

Answer

data sets

Answer

scrolling

Answer

blobs

Question 25

Which two statements describe the traits of an asynchronous API call? (Choose two.)

Accepted Answer

A callback function typically is used to process the response from an API call.

Accepted Answer

A call to an API does not block the code, but rather it allows application processing to continue.

Answer

Code execution blocks or waits for the call to an API to return.

Answer

The end user can experience latency or performance lag while waiting for the API call to return.

Answer

The order in which API calls return can be guaranteed.

Question 26

A developer is troubleshooting an API with the given API documentation and cURL command. What is the cause of this problem?

Accepted Answer

The authorization header is missing or incomplete.

Answer

The request body is missing or incomplete.

Answer

The API token specified is expired.

Answer

. The user is not allowed to post messages from their account.

Question 27

Which Cisco DevNet resource allows access to products in a development lab to explore, learn, and build applications that use Cisco APIs?

Accepted Answer

DevNet Sandbox

Answer

DevNet Code Exchange

Answer

DevNet Communities

Answer

DevNet Automation Exchange

Question 28

FILL BLANK -Fill in the blanks to complete the cURL command that invokes a RESTful API to retrieve a resource in JSON format using OAuth. curl `"X ____________ -H ` __________: application/json` \-H ` _______: Bearer AbCdEf123456` https://localhost/api/myresource

Accepted Answer

GET -Accept -Authorization -

Answer

Accept -Authorization -

Answer

GET -Accept -

Question 29

What are two benefits of managing network configuration via APIs? (Choose two.)

Accepted Answer

reduction in network changes performed manually

Accepted Answer

increased scalability and consistency of network changes

Answer

more security due to locking out manual device configuration

Answer

configuration on devices becomes less complex

Answer

eliminates the need of legacy management protocols like SNMP

Question 30

FILL BLANK -Fill in the blanks to complete the statement.Given a username of `devnet` and a password of `cisco123`, applications must create a base64 encoding of the string `________________` when sending HTTP requests to an API that uses _______________ authentication.

Accepted Answer

Basic -Reference:

Answer

Reference-Basic:

Question 31

Which method should be used to safely store the API keys?

Accepted Answer

in an environment variable unique to the system database

Answer

encrypted in a configuration file that is separate from the code

Answer

plain text in the code as a constant

Answer

encrypted in the code in a function

Question 32

DRAG DROP -Drag and drop the HTTP status codes from the left onto the correct descriptions on the right.Select and Place:

Accepted Answer

Option A is correct

Accepted Answer

Option B is correct

Question 33

How does requesting a synchronous API operation differ from requesting an asynchronous API operation?

Accepted Answer

clients can access the results immediately

Answer

clients receive responses with a task ID for further processing

Answer

clients subscribe to a webhook for operation results

Answer

. clients poll for the status of the execution of operations

Question 34

In which two ways is an application characterized when interacting with a webhook? (Choose two.)

Accepted Answer

receiver

Accepted Answer

listener

Answer

transaction monitor

Answer

codec

Answer

processor

Question 35

What are two use cases where webhooks are effective? (Choose two.)

Accepted Answer

Close a session with a web server after a specific amount of time.

Accepted Answer

Send an email to a customer of an online store after payment is complete

Answer

Filter out information from a response to an API call.

Answer

Inform a previously defined chat channel after a deployment fails

Answer

Change the response format or content type of an API call.

Question 36

Which HTTP response code should be returned when the request is completed, but there is no content to send for the request?

Accepted Answer

204

Answer

100

Answer

302

Answer

402

Question 37

Which HTTP response status code means `Forbidden`?

Accepted Answer

403

Answer

500

Answer

401

Answer

502

Question 38

An API call is constructed to retrieve the inventory in XML format by using the API. The response to the call is 401 Unauthorized. Which two headers must be added to the API call? (Choose two.)

Accepted Answer

Accept: application/xml

Accepted Answer

Authorization: Bearer dXNlcm5hbWU6cGFzc3dvcmQ=

Answer

Bearer-Token: dXNlcm5hbWU6cGFzc3dvcmQ=

Answer

Content-Type: application/xml

Answer

Authentication: Bearer dXNlcm5hbWU6cGFzc3dvcmQ=

Question 39

Question 39.

Accepted Answer

Option B is correct

Answer

A.

Question 40

Which action resolves a 401 error in response to an HTTP GET that is issued to retrieve a configuration statement using RESTCONF on a CSR 1000V?

Accepted Answer

Check the authentication credentials

Answer

Change the HTTP method to PUT

Answer

Check the MIME types in the HTTP headers

Answer

Change the transport protocol to HTTPS

Question 41

Question 41.

Accepted Answer

add the authorization header with the access token

Answer

change content-type as JSON

Answer

and a username-password combination to request command

Answer

change request method as GET

Question 42

A developer is trying to retrieve data over a REST API. The API server responds with an HTTP client error response code. After investigating the response, the developer realizes the response has a Retry-After header. What is the root cause of this error?

Accepted Answer

Too many requests were sent to the REST service in a given amount of time

Answer

An appliance limited the rate of requests to the transport layer.

Answer

The REST service is unreachable at the time of the REST request.

Answer

An appliance limited the rate of requests to the application layer.

Question 43

A developer needs a list of clients connected to a specific device in a Meraki network. After making a REST API call, the developer receives an unfamiliar response code. Which Cisco DevNet resource should be used to identify the meaning of the response code?

Accepted Answer

API documentation

Answer

Code Exchange

Answer

Learning Labs

Answer

Sandbox

Question 44

A developer is creating a script to interact with a REST API service which requires basic authentication. The credentials are "devnet:391665405" and the Base64 encoding of the credentials is "GV2bmV0dXNlcjpDaXNj=". Which payload and header combination must be used for authentication?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Answer

D.

Question 45

A 401 HTTP response code is returned when calling a REST API. What is the error state identified by this response code?

Accepted Answer

The request has not been accepted because it requires authentication.

Answer

The server cannot process the request as it has detected an issue in the request syntax or body.

Answer

The sever accepted the request but the client is not authorized for this content.

Answer

The server cannot find the requested resource because the path specified is incorrect.

Question 46

DRAG DROP -Drag and drop the Python code from the left onto the correct step on the right to call a REST API.Select and Place:

Accepted Answer

Option B is correct

Answer

A.

Question 47

A REST API returns this JSON output for a GET HTTP request, which has been assigned to a variable called `vegetables`. Using Python, which output is the result of this command? print(filter(lambda 1: 1['type'] == 'fruit', vegetables) [0]['items'][0]['items'][0])

Accepted Answer

kiwi

Answer

{'color': 'green', 'items': ['kiwi', 'grape']}

Answer

['kiwi', 'grape']

Answer

lettuce

Question 48

A developer is writing an application that uses a REST API and the application requires a valid response from the API. Which element of the response is used in the conditional check?

Accepted Answer

status code

Answer

body

Answer

headers

Answer

link

Answer

URL

Question 49

An application calls a REST API and expects a result set of more than 550 records, but each time the call is made, only 25 are returned. Which feature limits the amount of data that is returned by the API?

Accepted Answer

pagination

Answer

payload limit

Answer

service timeouts

Answer

rate limiting

Question 50

Question 50.

Accepted Answer

Option B is correct

Answer

A.

Question 51

Which status code is used by a REST API to indicate that the submitted payload is incorrect?

Accepted Answer

400

Answer

. 403

Answer

405

Answer

429

Question 52

What is a comparison of YAML and JSON?

Accepted Answer

JSON does not support comments and YAML does.

Answer

YAML has a more consistent approach to representing data compared to JSON.

Answer

YAML is a more verbose data structure compared to JSON.

Answer

JSON has more common usage in configuration management tools compared to YAML.

Question 53

Refer to the exhibit. Which XML snippet has interface information that conforms to the YANG model?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Answer

D.

Question 54

Several teams at a company are developing a new CRM solution to track customer interactions with a goal of improving customer satisfaction and driving higher revenue. The proposed solution contains these components:* MySQL database that stores data about customers* HTML5 and JavaScript UI that runs on Apache* REST API written in PythonWhat are two advantages of applying the MVC design pattern to the development of the solution? (Choose two.)

Accepted Answer

to provide separation between the view and the model by ensuring that all logic is separated out into the controller

Accepted Answer

to ensure that only one instance of the data model can be created

Answer

to enable multiple views of the same data to be presented to different groups of users

Answer

to ensure data consistency, which requires that changes to the view are also made to the model

Answer

to provide only a single view of the data to ensure consistency

Question 55

Into which type of Python data structure should common data formats be parsed?

Accepted Answer

dictionary

Answer

sequence

Answer

set

Answer

list

Question 56

What is a benefit of version control?

Accepted Answer

keeps track of all changes to the files

Answer

prevents two users from working on the same file

Answer

prevents the sharing of files

Answer

keeps the list of data types used in the files

Question 57

A file that already exists in a local repository is updated. Which command must be executed to ensure that the changes in the file are included in the next Git commit?

Accepted Answer

git update

Answer

git merge

Answer

git add

Answer

git rebase

Question 58

A developer is working on a feature for a new application. The changes in the existing branch named 'feat00304' must be integrated into a single commit with the current working primary branch named 'prodapp411926287'. Which git command must be used?

Accepted Answer

git merge --squash feat00304

Answer

git rebase --merge feat00304

Answer

git push --rebase feat00304

Answer

git checkout --squash feat00304

Question 59

What is the difference between YAML and JSON data structure?

Accepted Answer

YAML uses spaces; JSON uses parentheses

Answer

YAML uses indentation; JSON uses brackets and braces

Answer

YAML uses brackets and braces; JSON uses indentation

Answer

YAML uses parentheses; JSON uses spaces

Question 60

What is a benefit of using functions in the code for the development process?

Accepted Answer

faster code development

Answer

better user experience in the end product

Answer

improves code performance

Answer

easier to compile the code

Question 61

What is a functionality of the Waterfall method as compared to the Agile method for software development?

Accepted Answer

A phase begins after the previous phase has ended in Waterfall while Agile phases run in parallel.

Answer

Waterfall increases agility to implement faster while Agile promotes reliability.

Answer

Customers get feedback during the process in Waterfall while they can see the result at the end in Agile.

Answer

Requirements can be updated in Waterfall while in Agile it should be gathered in the beginning.

Question 62

Package updates from a local server fail to download. However, the same updates work when a much slower external repository is used. Why are local updates failing?

Accepted Answer

The update utility is trying to use a proxy to access the internal resource.

Answer

The server is running out of disk space.

Answer

The Internet connection is too slow.

Answer

The Internet is down at the moment, which causes the local server to not be able to respond.

Question 63

What does the Python function do?

Accepted Answer

It returns HTTP Basic Authentication

Answer

It returns DNAC user and password

Answer

It reads a token from a local JSON file and posts the token to the DNAC URL

Answer

It returns an authorization token

Question 64

The JSON data in the exhibit has been parsed and stored into a variable `data`. What returns the value `172.16.0.11`?

Accepted Answer

data['items'][0]['host']['value']

Answer

data['items']['host']['value']

Answer

data['items'][1]['host']['value']

Answer

data['items']['host'][1]

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