Cisco Cisco Certified DevNet Associate 200-901 Questions & Answers

• Question 351:

  What is the difference between YAML and JSON data structure?

  A. YAML uses spaces; JSON uses parentheses

  B. YAML uses indentation; JSON uses brackets and braces

  C. YAML uses brackets and braces; JSON uses indentation

  D. YAML uses parentheses; JSON uses spaces

  Correct Answer: B

  YAML (YAML Ain't Markup Language) and JSON (JavaScript Object Notation) are both data serialization formats, which are used to store and transmit data. They both have similar functionality and are used for similar purposes, but there are some key differences between the two.

  One of the main differences between YAML and JSON is in their data structure. YAML uses indentation to indicate the structure of the data, while JSON uses brackets and braces. In YAML, indentation is used to indicate the level of nesting of elements and to indicate the beginning and end of an object or an array. In JSON, brackets are used to define the beginning and end of an array, and braces are used to define the beginning and end of an object.

• Question 352:

  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:

  1.

  MySQL database that stores data about customers

  2.

  HTML5 and JavaScript UI that runs on Apache

  3.

  REST API written in Python

  What are two advantages of applying the MVC design pattern to the development of the solution? (Choose two.)

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

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

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

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

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

  Correct Answer: AB

• Question 353:

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

  A. sequence

  B. set

  C. dictionary

  D. list

  Correct Answer: C

  JSON: JSON data can be parsed into a Python dictionary using the json.loads() function from the built-in json module. This function takes a JSON string as input and returns a dictionary representing the data.

• Question 354:

  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?

  A. git update

  B. git merge

  C. git add

  D. git rebase

  Correct Answer: C

  https://github.com/git-guides/git-add

• Question 355:

  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?

  A. git rebase --merge feat00304

  B. git merge --squash feat00304

  C. git push --rebase feat00304

  D. git checkout --squash feat00304

  Correct Answer: B

  https://stackoverflow.com/questions/5308816/how-can-i-merge-multiple-commits-onto-another-branch-as-a-single-squashed-commit

• Question 356:

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

  A. 2xx

  B. 3xx

  C. 4xx

  D. 5xx

  Correct Answer: A

  https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#:~:text=10.2%20Successful%202xx,received%2C%20understood%2C%20and%20accepted.

• Question 357:

  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?

  A. Communication between the application and the services is not encrypted.

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

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

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

  Correct Answer: C

• Question 358:

  Why is refactoring done during test-driven development?

  A. to enable larger objects and longer methods

  B. to improve maintainability and readability

  C. to ensure that the previous uses of the objects are explained

  D. to ensure the duplication of essential code

  Correct Answer: B

• Question 359:

  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?

  A. times out

  B. rate limit

  C. pagination

  D. invalid password

  Correct Answer: C

• Question 360:

  Refer to the exhibit.

  

  A network engineer must change the configuration on devices daily. The Python script must collect CLI arguments from the user, organize data according to the Cisco-IOS-XE-native YANG model, and utilize Cisco REST APIs to make the configuration. Which workflow is being automated by the Python script?

  A. updating an existing route on the device

  B. adding a new route to a device

  C. including a route on the device and overwriting the current routes

  D. deleting the route that is passed through the command-line variables

  Correct Answer: B

  PUT - replaces the whole routing table PATCH - added the route to the existing

  - but if the route with ip mask and gw already exists, it does nothing

  (checked this with route options name, tag, distanceand multicast in the route before using the script)