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Free CCNA 200-901 Practice Questions 2026 Part1 | Cisco DevNet Associate

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Question #1
What is the first development task in test-driven development?
A. Write code that implements a desired function
B. Write a failing test case for a desired function
C. Reverse engineer the code for a desired function
D. Write a passing test case for existing code
View answer
Correct Answer: B

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Question #2
A company wants to automate the orders processed on its website using API. The network device that supports the solution must:support XML encodingsupport distributed transactionssupport YANG data modelsbe support software redundancyWhich requirement prevents the use of RESTCONF for the solution?
A. ANG data models
B. ML encoding
C. istributed transactions
D. oftware redundancy
View answer
Correct Answer: C
Question #3
What is a benefit of using a code review process in application development?
A. accelerates the deployment of new features in an existing application
B. provides version control during code development
C. enables the quick deployment of new code
D. eliminates common mistakes during development
View answer
Correct Answer: D
Question #4
How do XML and JSON compare regarding functionality?
A. XML provides support for mapping data structures into host languages than JSON
B. XML provides more human readability than JSON
C. JSON provides support for data types than XML
D. JSON natively supports arrays and XML does not natively support arrays
View answer
Correct Answer: D
Question #5
Which two statements describe the advantages of using a version control system? (Choose two.)
A. t allows for branching and merging so that different tasks are worked on in isolation before they are merged into a feature or master branch
B. t provides tooling to automate application builds and infrastructure provisioning
C. t allows multiple engineers to work against the same code and configuration files and manage differences and conflicts
D. t provides a system to track User Stories and allocate to backlogs
E. t allows developers to write effective unit tests
View answer
Correct Answer: AC
Question #6
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?
A. An appliance limited the rate of requests to the transport layer
B. The REST service is unreachable at the time of the REST request
C. Too many requests were sent to the REST service in a given amount of time
D. An appliance limited the rate of requests to the application layer
View answer
Correct Answer: C
Question #7
Which two situations align with infrastructure as code principles? (Choose two.)
A. nonreplicable snowflake servers
B. release versions to specific hardware
C. maximized configuration drift
D. easily reproducible systems
E. repeatable processes
View answer
Correct Answer: DE
Question #8
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?
A. Refactor the code by removing any unnecessary tests
B. Reverse engineer and rewrite the code logic
C. Using functions, rewrite any pieces of code that are repeated
D. Modify the code to use loops
View answer
Correct Answer: A
Question #9
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. ACommunication between the application and the services is not encrypted
B. BThe database credentials should be stored in the configuration files so that they are secured on the same server
C. CThe API keys are stored in the configuration files but should be stored in the vault service
D. DThe synchronization logs should be encrypted and not stored in a relational database
View answer
Correct Answer: C
Question #10
A 401 HTTP response code is returned when calling a REST API. What is the error state identified by this response code?
A. The server cannot process the request as it has detected an issue in the request syntax or body
B. The request has not been accepted because it requires authentication
C. The sever accepted the request but the client is not authorized for this content
D. The server cannot find the requested resource because the path specified is incorrect
View answer
Correct Answer: B
Question #11
How does a developer create and switch to a new branch called “my-bug-fix” to develop a product fix?
A. git checkout -b my-bug-fix
B. git branch -b my-bug-fix
C. git branch my-bug-fix
D. git checkout my-bug-fix
View answer
Correct Answer: C
Question #12
Refer to the exhibit.Which JSON is equivalent to the XML -encoded data?
A. ption B
B. ption A
C. ption C
D. ption D
View answer
Correct Answer: B
Question #13
What is a benefit of organizing code into modules?
A. enables the code to be broken down into layers
B. improves collaboration of the development team
C. makes it easier to deal with large and complex systems
D. enables the inclusion of more programming languages in the code
View answer
Correct Answer: B
Question #14
What is the outcome of executing this command?git clone ssh:/john@example.com/path/to/my-project.git
A. creates a local copy of a repository called “my-project”
B. initiates a new Git repository called “my-project”
C. creates a copy of a branch called “my-project”
D. creates a new branch called “my-project”
View answer
Correct Answer: A
Question #15
What is the outcome of executing this command?git clone ssh://john@exmaple.com/path/to/my-project_git
A. Creates a local copy of a repository called ''my project''
B. Creates a copy of a branch called ''my project''
C. Initiates a new Git repository called ''my project''
D. Creates a new branch called ''my project''
View answer
Correct Answer: A
Question #16
Refer to the exhibit. What is the effect of this Ansible playbook on an IOS router?
A. A new running configuration is pushed to the IOS router
B. The current running configuration of the IOS router is backed up
C. The start - up configuration of the IOS router is copied to a local folder
D. A new start - up configuration is copied to the IOS router
View answer
Correct Answer: B
Question #17
Which status code is used by a REST API to indicate that the submitted payload is incorrect?
A. 400
B. 403
C. 405
D. 429
View answer
Correct Answer: A
Question #18
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”?
A. data[‘items’][‘host’][‘value’]
B. data[‘items’][1][‘host’][‘value’]
C. data[‘items’][0][‘host’][‘value’]
D. data[‘items’][‘host’][1]
View answer
Correct Answer: C
Question #19
Which mechanism is used to consume a RESTful API design when large amounts of data are returned?
A. data sets
B. scrolling
C. pagination
D. blobs
View answer
Correct Answer: C
Question #20
Before which process is code review performed when version control is used?
A. checkout of code
B. merge of code
C. committing code
D. branching code
View answer
Correct Answer: B
Question #21
On which port does NETCONF operate by default?
A. 3
B. 30
C. 43
D. 22
View answer
Correct Answer: B
Question #22
Which description of a default gateway if true?
A. t is a device that receives IP packets that have no explicit next-hop in the routing table
B. t is a feature that translates between public and private addresses
C. t is a security feature that denies certain traffic
D. t is a device that receives Layer 2 frames with an unknown destination address
View answer
Correct Answer: A
Question #23
Which command reverses the last commit without changing the index file or the working tree position?
A. git revert HEAD
B. git reset --hard HEAD~3
C. git reset --soft HEAD^
D. git revert
E. Reveal Answer
View answer
Correct Answer: C
Question #24
Which type of HTTP method is used by the Meraki nad webex teams APIs to send webhook notifications?
A. HTTP GET
B. HTTP PUT
C. HTTP HEAD
D. HTTP POST
E. Reveal Answer
View answer
Correct Answer: D
Question #25
Which action do webhooks enable an application to perform?
A. Increase the request rate limit
B. Populate the application with restricted data
C. Receive real-time data
D. Implement a push model
View answer
Correct Answer: C
Question #26
Which two statements describe the advantages of using a version control system? (Choose two.)
A. It allows for branching and merging so that different tasks are worked on in isolation before they are merged into a feature or master branch
B. It provides tooling to automate application builds and infrastructure provisioning
C. It allows multiple engineers to work against the same code and configuration files and manage differences and conflicts
D. It provides a system to track User Stories and allocate to backlogs
E. It allows developers to write effective unit tests
View answer
Correct Answer: AC
Question #27
Before which process is code review performed when version control is used?
A. heckout of code
B. erge of code
C. ommitting code
D. ranching code
View answer
Correct Answer: B
Question #28
Which two encoding formats do YANG interfaces support? (Choose two.)
A. XML
B. JSON
C. XHTML
D. BER
E. plain text
View answer
Correct Answer: AB
Question #29
Which method should be used to safely store the API keys?
A. in an environment variable unique to the system database
B. encrypted in a configuration file that is separate from the code
C. plain text in the code as a constant
D. encrypted in the code in a function
View answer
Correct Answer: A
Question #30
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
View answer
Correct Answer: B
Question #31
Refer to the exhibit.What caused the error in this API request?
A. The API resource does not support the POST operation
B. The submitted JSON payload has a formatting issue
C. The API resource does not support JSON format payloads
D. The submitted JSON payload includes a field that is not supported by the API resource
View answer
Correct Answer: B
Question #32
Which line is an example of the start of a chunk from a unified diff?
A. @ -20191007T1200 +88,90 @@
B. @ -90,88 +20191008T1349@@
C. @ -20191007T1200 +20191008T1349@@
D. @ -88,10 +88,6 @@
View answer
Correct Answer: D
Question #33
Which two protocols are associated with the control plane on a network device? (Choose two.)
A. BGP
B. UDP
C. SNMP
D. FTP
E. OSPF
View answer
Correct Answer: AE
Question #34
Refer to the exhibit.Which Python data structure does my_json contain?
A. map
B. list
C. json
D. dict
View answer
Correct Answer: D
Question #35
Which HTTP response code should be returned when the request is completed, but there is no content to send for the request?
A. 100
B. 204
C. 302
D. 402
View answer
Correct Answer: B
Question #36
A developer creates an application that must provide an encrypted connection or API keys. The keys will be used to communicate with a REST API. Which command must be used for the secure connection?
A. url -X GET 'https://username
B. url -X GET 'http://username
C. url -v 'ftp://username
D. url -X PUSH 'http://username
View answer
Correct Answer: A
Question #37
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?
A. API documentation
B. Code Exchange
C. Learning Labs
D. Sandbox
View answer
Correct Answer: A
Question #38
What are two benefits of managing network configuration via APIs? (Choose two.)
A. more security due to locking out manual device configuration
B. configuration on devices becomes less complex
C. eliminates the need of legacy management protocols like SNMP
D. reduction in network changes performed manually
E. increased scalability and consistency of network changes
View answer
Correct Answer: DE
Question #39
What is the first development task in test-driven development?
A. rite code that implements a desired function
B. rite a failing test case for a desired function
C. everse engineer the code for a desired function
D. rite a passing test case for existing code
View answer
Correct Answer: B
Question #40
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
View answer
Correct Answer: C
Question #41
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?
A. body
B. headers
C. link
D. URL
E. status code
View answer
Correct Answer: B
Question #42
Refer to the exhibit.An engineer is comparing two tiles by using the unified cliff format What is determined by the content in the file2.py file?
A. Line 16 of file2
B. Line 17 of file2
C. Line 93 of file2
D. Line 92 of file2
View answer
Correct Answer: C
Question #43
In Python, which expression checks whether the script returns a success status code when the Requests library is used?
A. response
B. response
C. response
D. response
View answer
Correct Answer: A
Question #44
Refer to the exhibit.What does the Python function do?
A. It returns HTTP Basic Authentication
B. It returns DNAC user and password
C. It reads a token from a local JSON file and posts the token to the DNAC URL
D. It returns an authorization token
View answer
Correct Answer: A
Question #45
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
View answer
Correct Answer: B

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