DevNet Associate (Version 1.0) – Practice Final Exam Answers

DevNet Associate (Version 1.0) – DevNet Associate 1.0 Practice Final exam

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1. A network engineer is working on a bash script in order to automate some mundane tasks needed by the department. Why would the engineer add a she-bang (#!) to the top of the script as shown:

#!/bin/bash

  • The script file has specific commands that are preceded by the exclamation mark (!) and should not be executed.
  • The script file has specific commands that are preceded by the pound sign (#) and should not be executed.
  • The commands within the script fie are to have the output stored in the /bin/bash directory.
  • The script file has commands that need to be run in the bash shell.

2. An international manufacturing company is implementing an industrial internet of things plant infrastructure. The design requires that computing resources are located as close to the user as possible. Which cloud model is suitable for this situation?

  • public
  • edge
  • private
  • hybrid

Explanation: Edge clouds are located as close to the user as possible. Having computing power at the network edge is a benefit for internet of things devices such as cameras, industrial automation equipment, and autonomous vehicles.

3. What are three tools used by developers for scanning code to check for well-known security issues? (Choose three.)

  • Viptela
  • Brakeman
  • VisualCodeGrepper
  • Docker
  • Bandit
  • VIRL

4. A network engineer is configuring a Jenkins job and finishing with the following script in order to trigger the build:

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After saving the job, what should the engineer do next?

  • Test the script in Docker.
  • Run the job.
  • Open the Recent Changes option to verify the results of the job.
  • Manually run the samplerunning container.

Explanation: Once a script is created, use the Build Now Jenkins menu option to run the job. If the script is done correctly, then the Stage View should show three green boxes. If errors are found, check the script for errors.

5. What are three ways to mitigate SQL injection threats? (Choose three.)

  • stored procedures configured with the “db_owner” rights set as default
  • stateless packet-filtering firewalls
  • dynamic queries
  • database firewalls
  • whitelist input validation
  • parameterized database queries

Explanation: SQL injection is a basic web application attack technique which, if successful, can delete or change sensitive data or reveal it to the attacker. There are several methods to mitigate the threat of SQL injection such as the use of parameterized database queries, database firewalls, and whitelist input validation.

6. What is the purpose of adding salt to the password hashing process?

  • to decrease password complexity
  • to increase the length of a password
  • to make hashed passwords deterministic
  • to create a unique hash for every password

Explanation: Because of the deterministic nature of the hash function, hashed passwords are not unique. The same password always produces the same hash even if the password is created by different users. The salting process adds random data to the input of the hash function to guarantee a unique, nondeterministic output.

7. Match the CI/CD software development philosophy with a description.

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8. What is an operational characteristic of the local version control system?

  • It locks a file once it is checked out by a user to prevent modification by others.
  • It pushes a working copy of a file to a main repository after individuals have made changes.
  • It allows multiple individuals to edit a working copy of a file at the same time.
  • It stores a delta of two versions of a file as opposed to the file itself.

Explanation: There are three types of version control systems:

  • Local version control system
  • Centralized version control system
  • Distributed version control system

The local version control system stores the delta between the two versions of the file, as opposed to the file itself. When the user wants to revert to the previous version of the file, the delta is reversed to get to the requested version.

9. An organization is using the Waterfall methodology for a software development project. In what order are the SDLC phases completed when using this method?

  • requirements and analysis, design, testing, implementation, deployment, maintenance
  • requirements and analysis, design, implementation, testing, deployment, maintenance
  • requirements and analysis, design, implementation, deployment, testing, maintenance
  • requirements and analysis, design, deployment, testing, implementation, maintenance

10. In which phase of the SDLC process does the product development team gather feedback from the potential customer on the desired features for the new software?

  • design
  • deployment
  • implementation
  • requirements and analysis

11. Which Git command is used to get an initial copy on an existing Git repository for the first time?

  • git add
  • git copy
  • git clone
  • git repo

12. Refer to the exhibit. Which message format is being used?

DevNet Associate (Version 1.0) - Practice Final Exam Answers 13

  • JSON
  • HTML
  • YAML
  • XML

13. A student is learning Python using the interactive interpreter mode. The student issues these commands:

DevNet Associate (Version 1.0) - Practice Final Exam Answers 14

Which type of Python structure is created?

  • a method
  • a class
  • a function
  • a module

14. Match the Git stage with a description.

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15. How does YAML maintain data-structure hierarchy?

  • braces
  • brackets
  • parenthesis
  • indentation

16. Which SDLC phase concludes with a high quality, bug-free, working piece of software that is ready for production?

  • design
  • deployment
  • implementation
  • testing

Explanation: There are six phases in the SDLC process.

  • Requirements & analysis : The product owner and qualified team members gather the requirements for the software to be built.
  • Design: Software architects and developers design the software based on the provided software requirement specification document.
  • Implementation : Developers take the design documentation and develop the code according to that design.
  • Testing : Test engineers take the code and install it into the testing environment so that they can follow the test plan.
  • Deployment : The software is installed into the production environment.
  • Maintenance : The development team provides support for customers and works on software improvements.

17. Match the SDLC phase with its description. (Not all options are used.)

DevNet Associate (Version 1.0) - Practice Final Exam Answers 16

18. Which terminal command can be used to print the Python version number installed on a system?

  • python -h
  • python -i
  • python -V
  • which python

19. What are three platforms that the Firepower Management Center can run on in the overall architecture of a large enterprise? (Choose three.)

  • on every router
  • on a wide range of Cisco devices
  • in the Secure Operations Center (SOC)
  • on VMWare VSphere
  • in an availability zone
  • on Amazon Web Services (AWS)

Explanation: Firepower Management Center can run on VMware vSphere or Amazon Web Services (AWS). It can also run on a range of physical devices including the Cisco FMC series.

20. Which two types of APIs are supported by Cisco Finesse? (Choose two.)

  • AXL
  • REST
  • JavaScript
  • SOAP
  • Python SDK

21. An engineer is learning how to enable RESTful API access for the Cisco Meraki Dashboard. What is the first step that must be taken in order to use API calls with the Meraki enterprise cloud-managed networking infrastructure service?

  • The Meraki Dashboard API must first be enabled under Organizations > Settings within the GUI.
  • Each cloud-managed organization must specify API access and allow the Meraki Dashboard administrator to employ site-specific APIs.
  • The engineer must first generate an API key by going to the My Profile page within the GUI.
  • A GET request must be created and include header parameters including authentication credentials and the Meraki API URL.

22. What does the Intersight REST API enable an application developer to access?

  • JavaScript Object Notation
  • Management Information Model
  • IETF Interface
  • Universal Resource Locator

23. A student in the DevNet class is learning SDKS and APIS. What is the difference between an API and an SDK?

  • An API is essentially a documented set of URIs, whereas an SDK is a package integrated with code examples and libraries.
  • An API contains the components that have been created for a specific purpose, whereas an SDK is commonly an interface for a service.
  • An API is a tool box that contains multiple SDKs, whereas each SDK allows the creation of software for a specific hardware platform.
  • An API is a software development tool for developing applications, whereas an SDK is a set of protocols for building application software.

Explanation: Most SDKs are packages that require installation and are integrated with libraries, documents, and code examples. APIs are essentially a documented set of URIs that act as an interface for a service.

24. Which modeling language is most commonly used for data modeling?

  • Python
  • YAML
  • YANG
  • SQL

Explanation: YANG, an acronym for Yet Another Next Generation, is a data modeling language used to model configuration and state data manipulated by the Network Configuration Protocol (NETCONF), NETCONF remote procedure calls, and NETCONF notifications.

25. Match the description to the corresponding layer of the OSI model. (Not all options are used.)

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26. Which field in an 802.1Q Ethernet frame is used by switches to identify VLAN membership of the frame?

  • Tag
  • Data
  • FCS
  • Preamble

27. Which two statements are correct if a configured NTP master on a network cannot reach any clock with a lower stratum number? (Choose two.)

  • The NTP master will lower its stratum number.
  • The NTP master will be the clock with 1 as its stratum number.
  • Other systems will be willing to synchronize to that master using NTP.
  • The NTP master will claim to be synchronized at the configured stratum number.
  • An NTP server with a higher stratum number will become the master.

Explanation: If the network NTP master cannot reach any clock with a lower stratum number, the system will claim to be synchronized at the configured stratum number, and other systems will be willing to synchronize to it using NTP.

28. What are three parts of an IPv6 global unicast address? (Choose three.)

  • a global routing prefix that is used to identify the network portion of the address that has been provided by an ISP
  • a global routing prefix that is used to identify the portion of the network address provided by a local administrator
  • an interface ID that is used to identify the local network for a particular host
  • an interface ID that is used to identify the local host on the network
  • a subnet ID that is used to identify networks inside of the local enterprise site

Explanation: There are three elements that make up an IPv6 global unicast address. A global routing prefix which is provided by an ISP, a subnet ID which is determined by the organization, and an interface ID which uniquely identifies the interface interface of a host.

29. Match the IPv6 address to the IPv6 address type. (Not all options are used.)

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30. What attribute of a NIC would place it at the data link layer of the OSI model?

  • IP address
  • RJ-45 port
  • attached Ethernet cable
  • MAC address
  • TCP/IP protocol stack

Explanation: The data link layer describes media access and physical addressing. The encoding of a MAC address on a NIC places it at that layer. Ports and cables are placed at the physical layer of the OSI model. IP addresses are placed at the network layer. The TCP/IP protocol stack describes a different model.

31. Match the firewall function to the type of threat protection it provides to the network. (Not all options are used.)

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  • packet filtering – prevents access based on IP or MAC address
  • URL filtering – prevents access to websites
  • network address translator – (none)
  • stateful packet inspection – prevents unsolicited incoming sessions
  • application filtering – prevents access by port number

Explanation: Firewall products come packaged in various forms. These products use different techniques for determining what will be permitted or denied access to a network. They include the following:

+ Packet filtering – Prevents or allows access based on IP or MAC addresses
+ Application filtering – Prevents or allows access by specific application types based on port numbers
+ URL filtering – Prevents or allows access to websites based on specific URLs or keywords
+ Stateful packet inspection (SPI) – Incoming packets must be legitimate responses to requests from internal hosts. Unsolicited packets are blocked unless permitted specifically. SPI can also include the capability to recognize and filter out specific types of attacks, such as denial of service (DoS)

32. Which protocol automates assignment of IP addresses on a network, and which port number does it use? (Choose two.)

  • DHCP
  • DNS
  • SMB
  • 53
  • 67
  • 80

Explanation: DNS uses port 53 and translates URLs to IP addresses. SMB provides shared access to files and printers and uses port 445. Port 80 is used by HTTP. HTTP is a protocol used to communicate between a web browser and a server.

33. What are the two types of DevNet Sandboxes? (Choose two.)

  • assigned
  • always-on
  • reserved
  • intermal-use only
  • exclusive

34. Which fee-based Cisco DevNet developer support option provides a response time of 1 business day?

  • knowledge base
  • chat with DevNet
  • case-based ticket
  • community forum

35. When working with both a live production environment and testing code in a shared developer sandbox, what are two important rules to follow? (Choose two.)

  • Never request assistance or share information in community or public environments.
  • Never use publicly posted tokens or credentials in production environment.
  • Never provide any identifying information in community or public environments.
  • Never use a customized token in the sandbox, but instead use personal tokens that currently exist.
  • Never use any personal tokens in the sandbox, but instead use a customized token for development.

Explanation: When working in a leaming environment or community-based environment, remember never to use any personal tokens or credentials in the sandbox. Also, do not use tokens or credentials provided in a course or online community in a production environment. It is important to be protective of tokens, passwords, and other identifying information in development environments.

36. Which DevNet resource would a student use to learn how to make REST API requests?

  • DevNet Learning Labs
  • DevNet Sandbox
  • Code Exchange
  • DevNet Support

Explanation: DevNet provides a catalog of free, self-paced online tutorials called Learning Labs.

37. Which two forums are available on the Cisco Developer Community? (Choose two.)

  • Developer Automation
  • Developer Networking
  • Developer Coding
  • Developer Support
  • Developer Security

Explanation: There are a total of ten developer forums on the Cisco Developer Community:

Developer Networking
Developer Collaboration
Developer Security
Developer Data Center
Developer Intemet of Things
Developer Cloud
Developer Services
Developer Mobility
Developer Analytics and Automation Software
Developer DevNet Site

38. What are two benefits of using automation for IT infrastructure? (Choose two.)

  • increased implementation of specific opinionated companion components
  • increased speed in the deployment of technologies and products
  • reduced user requisition requests for on-demand infrastructure
  • reduced risk while working at scale
  • reduced need for IT personnel and operations staff

39. Which component is required by both Puppet and Chef to be run on hosts?

  • agents that query a server to determine their desired state, then converge upon it
  • cron jobs that access a server to randomize access times to prevent server overload
  • IPtables that enable masquerade tunneling
  • certificates for authentication and encryption

40. What are two processes that can be used to execute remote scripts securely? (Choose two.)

  • pipe scripts to a remote machine using cat | telnet and execute them in sequence with other commands, capturing and returning results to a local terminal
  • access the built-in rexec command within Bash, target the IP address of the remote machine, and execute the Bash command
  • store scripts locally, transmit them to a target machine with scp, log into the remote machine via ssh, and execute the scripts
  • store scripts on a webserver, log into the remote machine, and retrieve the scripts using wget via HTTP
  • store scripts in a Git repository, install git on the remote machine, clone the repo, check out a branch, and execute the scripts

Explanation: There are many ways to configure remote systems using scripts. However, scripts should be delivered to a remote system through the use of secured protocols or services or both.

41. What is an example of an SLI?

  • All services provided include data integrity and security and comply with local regulations about where and how data is stored.
  • 95% of requests will be served within 75 milliseconds.
  • All applications being provided will offer a good-enough experience to the user base.
  • 100% availability will be maintained for any services provided.

42. Which component of a software-defined infrastructure provides available cloud resources within hours or minutes of needing them?

  • repeatability
  • observability
  • self-service
  • platform abstraction

43. A user is working on Ansible on the local NMS to manage remote network devices. The user issues the ansible webservers -m ping command to test the communication. What is the parameter ping in the command?

  • a function
  • a class
  • a module
  • a method

Explanation: In the ansible webservers -m ping command, the parameter ping is an Ansible module invoked by the switch -m

44. A network operator is testing a network management application that uses REST API to communicate with network devices. The operator received an HTTP response code 403 in a test step. What does this response code indicate?

  • Client has not authenticated to access the site or API call.
  • The page at HTTP URL location does not exist or is hidden.
  • Request failed due to a client-side issue.
  • Access is not granted based on supplied credentials.

Explanation: Most common HTTP status codes include:

200 – OK (using GET or POST to exchange data with an API successfully)
201 – Created (creating resources by using a REST API call successfully)
400 – Bad Request (The request from the client is failed due to client-side issue.)
401 – Unauthorized (The client is not authenticated to access site or API call.)
403 – Forbidden (The access request is not granted based on the supplied credentials.)
404 – Not Found (The page requested at HTTP URL location does not exist or is hidden.)

45. Which three characteristics are associated with the SOAP architecture? (Choose three.)

  • stateless
  • neutral
  • extensible
  • layered system
  • independent
  • uniform interface

46. A client is using an API key to authenticate and access resources on a website through a REST API. The string in the API request is GET http://example.com:8080/v1/books?API_KEY= < key >. Which component in the API request is used to provide this string?

  • cookie
  • query string
  • header
  • body data

47. Refer to the exhibit. A student is learning network automation with Python and REST API. The student constructs a small Python script to get information from a local network device. The device is a sandbox located inside the college lab and it is using a self-signed SSL certificate. Which parameter is needed in the Python code (in place of the question mark) to skip the SSL verification?

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  • verify = True
  • verify = False
  • verify = NO
  • verify = YES

Explanation: When the protocol used within the URI is HTTPS, the connection will perform an SSL handshake between the client and the server for secure authentication. This handshake needs to be successful before the REST API request is even sent to the API server. However, because the SSL is self-signed, it would not pass the SSL verification with a CA. In the case of learning and practicing on a local resource, the SSL verification can be turned off by the “verify = False” parameter.

48. What are two features of REST APIs? (Choose two.)

  • They communicate over HTTP.
  • They follow the Representational State Transfer principles.
  • Requests always contain data.
  • Responses are always in JSON format.
  • They maintain session states in communications.

Explanation: REST APIs are the short name for Representational State Transfer Webservice APIs. They follow the REST architectural style and communicate over HTTP. REST API requests and responses can use many different data formats; it is not mandatory to use JSON. It is also not mandatory for requests or responses to contain data. Data is provided when applicable. Communication using REST APIs is stateless.

49. What are two advantages of using an APl rate limit? (Choose two.)

  • It protects against a DoS attack.
  • It reduces the amount of overhead within the API request.
  • It allows requests to be processed in a prioritized manner.
  • It supports token passing so tha each client gets a turn.
  • It provides better quality of service and response time.

Explanation: An API rate limit allows a web service to control the number of requests made in a defined amount of time and is a best practice to use for public and unrestricted APIS. Benefits of using rate limits include the following:

Avoids a server overload from too many requests at once
Provides better service and response time to all users
Protects against a denial of service (DoS) attack

50. Which three authentication mechanisms are used in REST APIs? (Choose three.)

  • basic authentication
  • OAuth
  • open authentication
  • API Key
  • bearer authentication
  • SSO

Explanation: For security reasons, most REST APIs require authentication to prevent random users from being able to create, update, or delete information incorrectly or maliciously. Basic Authentication, Bearer Authentication, and API Key are authentication mechanisms used by REST APIs. OAuth is an authorization mechanism

51. What are two advantages of using an API rate limit? (Choose two.)

  • It reduces the amount of overhead within the API request.
  • It protects against a DoS attack.
  • It allows requests to be processed in a prioritized manner.
  • It provides better quality of service and response time.
  • It supports token passing so that each client gets a turn.

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kithmini thathsara jasin arachchi
kithmini thathsara jasin arachchi
21 days ago

What are two advantages of using an API rate limit? (Choose two.)

  • It provides better quality of service and response time.
  • It protects against a DoS attack.
  • It allows requests to be processed in a prioritized manner.
  • It reduces the amount of overhead within the API request.
  • It supports token passing so that each client gets a turn.
Amarendar
Amarendar
1 month ago

What are two advantages of using an API rate limit?

Rate limiting advantages:

  • avoid a server overload from too many requests at once
  • provide better service and response time to all users
  • protect against a denial-of-service (DoS) attack