Cisco Cisco Certified DevNet Associate 200-901 Questions & Answers

• Question 181:

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

  A. application/yaml-data+json

  B. application/yang-data+json

  C. application/xml-data+json

  D. application/json-data+xml

  Correct Answer: B

  RESTCONF is a HTTP-based protocol that uses the REST architectural style to enable the manipulation of data on a network device. It is designed to work with data models defined using the YANG data modeling language, and the default data encoding method for RESTCONF is application/yang-data+json.

• Question 182:

  Which port does HTTPS use by default?

  A. 433

  B. 443

  C. 803

  D. 883

  Correct Answer: B

• Question 183:

  An engineer prepares a set of Python scripts to interact with network devices. To avoid network performance issues, the engineer wants to run them in a test environment. Which resource must be used to monitor the live execution of code in an always-available environment?

  A. packet tracer

  B. learning labs

  C. sandbox

  D. code exchange

  Correct Answer: C

• Question 184:

  Refer to the exhibit.

  

  The YAML shown contains an object "param0" that is equal to "Workflow1", a second object "param1" that contains an object called "list" which contains an array of two objects, "name" (equal to "VLAN_ID") and "value" (equal to a text value "198"), and finally a third object "param2" that is equal to "0". What is the equivalent message in JSON data format?

  

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: D

• Question 185:

  What is a feature of XML compared to other data formats?

  A. It uses tags to define the structure.

  B. It uses parenthesis for key-value pairs.

  C. It uses indentation to define the structure.

  D. It uses namespaces for list representation.

  Correct Answer: A

• Question 186:

  What is a capability of Ansible playbooks?

  A. They execute scheduled tasks regularly.

  B. They define the state for a device configuration.

  C. They collect SNMP logs from networking devices.

  D. They utilize the target device agent to execute.

  Correct Answer: B

  Declarative feature Ansible Automation Platform uses a declarative model that lets you describe the "what" (desired state of your systems and services) versus the "how" (steps to achieve that desired state). This goal-centric approach makes it easier for your IT operations teams to quickly start automating and supports reliable, idempotent infrastructure configuration. https://www.ansible.com/use-cases/configuration-management

• Question 187:

  What is the purpose of running tests before writing code in test-driven development?

  A. to find unexpected failures in the tests

  B. to demonstrate that the tests fail for expected reasons

  C. to ensure that the tests pass

  D. to provide proof of the work carried out

  Correct Answer: B

  In Test-Driven Development (TDD), developers write tests before writing code. The purpose of running the tests before writing code is to demonstrate that the tests fail for expected reasons. This is because the tests are written to test the functionality that the developer is about to add to the codebase, and since that functionality does not yet exist, the tests should fail. This is an important step in the TDD process because it confirms that the tests are correctly identifying the missing functionality and that they are not passing due to an error in the tests themselves.

• Question 188:

  What are two benefits of implementing common data structures when working with APIs in remote systems? (Choose two.)

  A. ensures that developers are limited to using one data schema type

  B. prevents multivendor interoperability

  C. improves security in RESTful web services

  D. enforces standardized data structures

  E. leverages code that is easily managed and reused

  Correct Answer: DE

  Implementing common data structures when working with APIs in remote systems has several benefits. One benefit is that it enforces standardized data structures, which helps to ensure that data is consistently organized and easy to parse.

  This can make it easier for developers to work with the API and understand the data being returned.

  Another benefit of using common data structures is that it leverages code that is easily managed and reused. This can save time and resources, as developers do not have to spend as much time writing and debugging code. It can also

  improve the overall quality and reliability of the API, as the code is more likely to have been thoroughly tested and debugged.

• Question 189:

  What is a capability of the AXL API?

  A. It signs a user in to a phone that is configured for extension mobility.

  B. It pulls logs for the Cisco Tomcat service.

  C. It authenticates users who exist in Cisco Unified Communications Manager.

  D. It provides support for HTTP and HTTPS communications.

  Correct Answer: C

• Question 190:

  A developer creates a program in which an object maintains a list of classes based on the observer pattern. The classes are dependent on the object. Whenever the state of the object changes, it notifies the dependent classes directly through callbacks. Which advantage of the observer pattern offers minimum dependencies and maximum flexibility between dependent objects or classes?

  A. tight coupling

  B. cohesion

  C. mediation

  D. loose coupling

  Correct Answer: D

  loose coupling offers minimum dependencies and maximum flexibility between dependent objects or classes in the observer pattern. Loose coupling refers to the degree to which one object or class knows about or depends on another object or class. In the observer pattern, the object being observed (the "subject") maintains a list of dependent classes (the "observers"), but the subject and the observers have a minimal amount of knowledge about each other. This allows the subject and the observers to be changed or replaced independently without affecting the other.