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CISCO 200-901 Free Exam Questions

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1 / 60

Which task is performed because the test-driven development approach is being used?

Refactoring code that is covered by existing tests

Testing existing software before developing new code

Writing code without committing any coding violations

Creating test scenarios based on continuous development

2 / 60

Refer to the exhibit.

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

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

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

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

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

3 / 60

Which two encoding formats do YANG interfaces support? (Choose two.)

JSON, plain text

XHTML, BER

BER, XML

plain text, JSON

XML, JSON

4 / 60

A developer is reviewing a code that was written by a colleague. It runs fine, but there are many lines of code to do a seemingly simple task repeatedly. Which action organizes the code?

Reverse engineer and rewrite the code logic

Modify the code to use loops

Refactor the code by removing any unnecessary tests

Using functions, rewrite any pieces of code that are repeated

5 / 60

Which principle is a value from the manifesto for Agile software development?

Customer collaboration over contract negotiation

Adhering to a plan over responding to requirements

Detailed documentation over working software

Processes and tools over teams and interactions

6 / 60

A developer needs to prepare the file README.md in the working tree for the next commit operation using Git. Which command needs to be used to accomplish this?

git add README.md staging

git commit README.md

git -a README.md

git add README.md

7 / 60

How does a developer create and switch to a new branch called `my-bug-fix` to develop a product fix?

git checkout my-bug-fix

git branch my-bug-fix

git branch -b my-bug-fix

git checkout -b my-bug-fix

8 / 60

Which action does the Git command git merge allow the developer to perform?

Push changes to the remote repository

Create, list, rename, and delete branches

Switch between branches

Combine multiple sequences of commits into one unified history

9 / 60

Which advantage does the agile process offer compared to waterfall software development?

To have each phase end before the next begins

To fix any issues at the end of the development cycle

To view the full scope of end-to-end work

To add or update features with incremental delivery

10 / 60

What is the outcome of executing this command?
git clone ssh:/[email protected]/path/to/my-project.git

creates a new branch called ג€my-projectג€

creates a copy of a branch called ג€my-projectג€

initiates a new Git repository called ג€my-projectג€

creates a local copy of a repository called ג€my-projectג€

11 / 60

How do XML and JSON compare regarding functionality?

XML provides more support for mapping data structures into host languages than JSON

JSON natively supports arrays and XML does not natively support arrays

JSON provides less support for data types than XML

XML provides more human readability than JSON

12 / 60

When a Cisco IOS XE networking device is configured using RESTCONF, what is the default data-encoding method?

XML

YAML

x-form-encoding

JSON

13 / 60

What is the Git command to delete a local branch named `experiment` without a warning?

git branch ג€"D experiment

git branch ג€"f experiment

git branch ג€"n experiment

git branch ג€"rm experiment

14 / 60

What is a benefit of organizing code into modules?

Enables the reuse of code

Enables code to be multifunctional

Improves overall performance

Reduces the length of code

15 / 60

Which statement describes the benefit of using functions in programming?

Functions allow problems to be split into simpler, smaller groups, and reduce code repetition, which makes the code easier to read

Functions create the implementation of secret and encrypted algorithms

Functions store mutable values within a script or application

Functions ensure that a developer understands the inner logic contained before using them as part of a script or application

16 / 60

In the test-driven development model, what is changed after a test fails?

Code

Test

Schedule

Project requirements

17 / 60

In test-driven development, what are two of the green bar patterns? (Choose two.)

Another test, Break

Break, Starter test

Triangulate, Fake it

Starter test, Triangulate

Fake it, Starter test

18 / 60

What is a benefit of test-driven development?

increased code quality

early customer involvement

strict adherence to product requirements

faster releases that have minimal features

19 / 60

What is the first development task in test-driven development?

Write a passing test case for existing code

Reverse engineer the code for a desired function

Write code that implements a desired function

Write a failing test case for a desired function

20 / 60

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

User acceptance testers develop the test requirements, Tests are created when code is ready for release

It enables code refactoring, Write a test before writing code

Tests are created when code is ready for release, Implementation is driven by incremental testing of release candidates

Implementation is driven by incremental testing of release candidates

Write a test before writing code, User acceptance testers develop the test requirements

21 / 60

Before which process is code review performed when version control is used?

Branching code

Committing code

Checkout of code

Merge of code

22 / 60

What is an advantage of a version control system?

Forces the practice of trunk-based development

Prevents over-writing code or configuration files

Ensures that unit tests are written

Facilitates resolving conflicts when merging code

23 / 60

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?

Send the Authentication header in the request with a valid configuration

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

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

Update the credentials that are already supplied and retry the request

24 / 60

Refer to the exhibit. A developer creates a Python script that queries Cisco Webex. When the script is executed, a 401 code is returned. After troubleshooting, the developer discovers that the service is missing privileges. Which change to the header in line 4 of the script results in the code 200?

header = {ג€Authorizationג€ : ג€Bearer YOUR_TOKENג€}

header = {ג€Authorization Bearerג€ : ג€YOUR_TOKENג€}

header = {ג€Authentication Bearerג€ : ג€YOUR_TOKENג€

header = {ג€Authenticationג€: ג€Bearer YOUR_TOKENג€}

25 / 60

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?

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

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

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

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

26 / 60

Refer to the exhibit. A Python code has been written to query a device. The executed code results in the error shown. Which action resolves the problem?

import requests

pip install requests

requests(ג€GETג€, base_url + request_url, cookies=cookies)

import json

27 / 60

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

response.status_code != requests.codes.ok

response.status_code == requests.ok

response.code == requests.codes.ok

response.status_code == requests.codes.ok

28 / 60

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

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

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

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

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

29 / 60

Which API is used to obtain data about voicemail ports?

Webex Devices

Finesse Gadgets

Webex Teams

Cisco Unified Communications Manager

30 / 60

Refer to the exhibit.

What caused the error in this API request?

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

The API resource does not support JSON format payloads

The API resource does not support the POST operation

The submitted JSON payload has a formatting issue

31 / 60

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

Pagination

Blobs

Scrolling

Data sets

32 / 60

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

DevNet Automation Exchange

DevNet Communities

DevNet Code Exchange

DevNet Sandbox

33 / 60

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

302

402

100

204

34 / 60

Refer to the exhibit. Which data is specified in the response header?

ג€typeג€: ג€switchג€

{ ג€idג€: ג€a123456bcdeג€, HTTP/1.1 200 OK ג€statusג€: ג€onlineג€, ג€typeג€: ג€switchג€ }

HTTP/1.1 200 OK

Content-Type

35 / 60

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

Receiver, Listener

Transaction monitor, Processor

Codec, Listener

Processor, Receiver

Listener , Transaction monitor

36 / 60

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

Clients receive responses with a task ID for further processing

Clients can access the results immediately

Clients subscribe to a webhook for operation results

Clients poll for the status of the execution of operations

37 / 60

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

Plain text in the code as a constant

Encrypted in a configuration file that is separate from the code

In an environment variable unique to the system database

Encrypted in the code in a function

38 / 60

Refer to the exhibit.

An administrator attempts to perform a GET using the Cisco IOS XE RESTCONF API to return the hostname of a device. The sequence diagram illustrates the
HTTP messages observed. Which change to the API request resolves the issue?

Add Content-Type HTTP header with 'application/yang-data+json' using ג€"H 'Content-Type: application/yang-data+json'

Change the request method from ג€"X ג€GETג€ to ג€"X ג€POSTג€

Remove the ג€"H 'Accept: application/yang-data+json' HTTP header because it is not required

Add ג€"'u cisco:cisco' in the end of the cURL command

39 / 60

Which HTTP response status code means `Forbidden`?

403

500

401

502

40 / 60

Refer to the exhibit.

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.)

Bearer-Token: dXNlcm5hbWU6cGFzc3dvcmQ=, Content-Type: application/xml

Content-Type: application/xml, Authentication: Bearer dXNlcm5hbWU6cGFzc3dvcmQ=

Authentication: Bearer dXNlcm5hbWU6cGFzc3dvcmQ=, Bearer-Token: dXNlcm5hbWU6cGFzc3dvcmQ=

Accept: application/xml, Authorization: Bearer dXNlcm5hbWU6cGFzc3dvcmQ=

Authorization: Bearer dXNlcm5hbWU6cGFzc3dvcmQ=

41 / 60

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?

Check the authentication credentials

Change the transport protocol to HTTPS

Check the MIME types in the HTTP headers

Change the HTTP method to PUT

42 / 60

Refer to the exhibit.

A developer needs to upload a local file by using the REST API. The developer gathers information according to the documentation and sends the request by using the cURL command in the exhibit but gets an error code. Which action should be followed to get a valid response?

Change request method as GET

And a username-password combination to request command

Change content-type as JSON

Add the authorization header with the access token

43 / 60

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?

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

An appliance limited the rate of requests to the application layer

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

An appliance limited the rate of requests to the transport layer

44 / 60

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?

Sandbox

Learning Labs

Code Exchange

API documentation

45 / 60

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

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

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

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

The request has not been accepted because it requires authentication

46 / 60

What is a benefit of version control?

Keeps the list of data types used in the files

Prevents the sharing of files

Prevents two users from working on the same file

Keeps track of all changes to the files

47 / 60

Refer to the exhibit. What does the command marked (2) do when it is run?

It deletes the ג€testג€ branch

It does not delete the branch until it is merged

It duplicates the ג€testג€ branch

It deletes the ג€testג€ branch only if a new branch is created

48 / 60

What is a comparison of YAML and JSON?

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

YAML is a more verbose data structure compared to JSON

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

JSON does not support comments and YAML does

49 / 60

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

400

405

429

403

50 / 60

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?

Rate limiting

Payload limit

Service timeouts

Pagination

51 / 60

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?

Status code

URL

Link

Body

Headers

52 / 60

Refer to the exhibit.

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])

kiwi

['kiwi', 'grape']

lettuce

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

53 / 60

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

Set

List

Sequence

Dictionary

54 / 60

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?

git add

git merge

git update

git rebase

55 / 60

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?

git checkout --squash feat00304

git push --rebase feat00304

git rebase --merge feat00304

git merge --squash feat00304

56 / 60

What is the difference between YAML and JSON data structure?

YAML uses parentheses; JSON uses spaces

YAML uses spaces; JSON uses parentheses

YAML uses brackets and braces; JSON uses indentation

YAML uses indentation; JSON uses brackets and braces

57 / 60

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

Faster code development

Easier to compile the code

Improves code performance

Better user experience in the end product

58 / 60

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

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

Waterfall increases agility to implement faster while Agile promotes reliability

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

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

59 / 60

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?

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

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

The Internet connection is too slow

The server is running out of disk space

60 / 60

Refer to the exhibit.

What does the Python function do?

It returns an authorization token

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

It returns DNAC user and password

It returns HTTP Basic Authentication

Your score is

The average score is 68%

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