CISCO 200-901 Developing Applications and Automating Workflows using Cisco Core Platforms (DEVASC) Free Practice Test — 30 Questions
Exam Code: 200-901
30 questions · Full explanations · No account required

Question 1

In a software development project, a team is tasked with creating a function that calculates the factorial of a number. The function must handle both positive integers and zero, returning the correct factorial value. Additionally, the team needs to ensure that the function is efficient and does not exceed a maximum recursion depth of 1000 calls. Given the following implementation in Python, identify the potential issues and the best approach to optimize the function while maintaining correctness.

Accepted Answer

python

Question 2

A software development team is implementing a Continuous Integration/Continuous Deployment (CI/CD) pipeline using Jenkins. They want to ensure that their builds are not only automated but also efficient in terms of resource usage. The team decides to configure Jenkins to run builds in parallel across multiple agents. They have a total of 10 agents available, and each build takes approximately 30 minutes to complete. If the team has 5 different projects that need to be built, how long will it take to complete all builds if they can run 2 builds per agent simultaneously?

Accepted Answer

30 minutes

Question 3

A software development team is using Postman to test a RESTful API that provides weather data. They need to ensure that the API adheres to the OpenAPI Specification (formerly known as Swagger). The team is particularly focused on validating the API\'s response structure, including the data types and required fields. They decide to create a Postman collection that includes various test cases for different endpoints. Which of the following strategies would best help them ensure that their API documentation is accurate and comprehensive, while also facilitating automated testing?

Accepted Answer

Utilize Postman's built-in testing framework to write tests that validate the response schema against the OpenAPI Specification, ensuring that all required fields are present and of the correct data type.

Question 4

In a network automation scenario, a company is looking to implement a solution that allows for the automatic provisioning of virtual machines (VMs) based on specific workload requirements. The automation tool must be able to analyze current resource utilization metrics and predict future needs based on historical data. If the company has a total of 100 VMs and the average CPU utilization is currently at 75%, with a projected increase of 10% in workload over the next month, what would be the recommended action to ensure optimal performance while maintaining cost efficiency?

Accepted Answer

Increase the number of VMs by 20% to accommodate the projected workload increase.

Question 5

In a microservices architecture, you are tasked with designing a RESTful API for a new service that manages user profiles. The API needs to support the following operations: creating a new user profile, retrieving user profile details, updating existing profiles, and deleting profiles. Given that the API will be accessed by various clients, including web and mobile applications, which of the following design principles should be prioritized to ensure optimal performance and scalability of the API?

Accepted Answer

Implementing stateless interactions and using appropriate HTTP methods for each operation.

Question 6

A software development team is implementing a Continuous Integration/Continuous Deployment (CI/CD) pipeline using Jenkins. They want to ensure that their builds are not only automated but also efficient in terms of resource usage. The team decides to configure Jenkins to run builds in parallel across multiple agents. If each build takes an average of 10 minutes and the team has 5 agents available, what is the maximum number of builds that can be executed simultaneously, and how would this configuration impact the overall build time if they have 20 builds to run?

Accepted Answer

5 builds can run simultaneously, and the total build time will be 10 minutes.

Question 7

A network administrator is tasked with provisioning a new set of IoT devices across a large manufacturing facility. The devices need to be configured to connect to the corporate network securely and efficiently. The administrator decides to use a centralized management system that supports Zero Touch Provisioning (ZTP). Which of the following best describes the process and benefits of using ZTP in this scenario?

Accepted Answer

ZTP allows devices to automatically download their configuration and software updates from a central server upon connection, minimizing manual intervention and reducing deployment time.

Question 8

In a Python application designed to process financial transactions, you need to store various types of data, including transaction amounts, timestamps, and user IDs. You decide to implement a function that calculates the total transaction amount for a given user over a specified period. The function takes a list of transactions, where each transaction is represented as a dictionary containing \'amount\', \'timestamp\', and \'user_id\'. Given the following transactions:

Accepted Answer

python

Question 9

A software development team is implementing a Continuous Integration/Continuous Deployment (CI/CD) pipeline to streamline their application delivery process. They decide to use a combination of automated testing, version control, and deployment strategies. During the initial setup, they encounter a scenario where a new feature branch is created from the main branch. After several commits, the feature branch is merged back into the main branch. However, they notice that the automated tests fail during the deployment stage. What could be the most effective strategy to ensure that the CI/CD pipeline remains robust and minimizes the risk of introducing errors into the main branch?

Accepted Answer

Implement a mandatory pull request review process that includes automated testing for all branches before merging into the main branch.

Question 10

In a Python program, you are tasked with calculating the total cost of items in a shopping cart. Each item has a price and a quantity. You have a list of tuples where each tuple contains the price of an item and the quantity purchased. For example, the list is defined as `cart = [(10.99, 2), (5.49, 3), (3.99, 1)]`. What is the correct way to calculate the total cost of the items in the cart using a list comprehension?

Accepted Answer

`total_cost = sum(price * quantity for price, quantity in cart)`

Question 11

A company is planning to migrate its on-premises applications to a cloud environment using Cisco\'s cloud solutions. They need to ensure that their applications can scale dynamically based on user demand while maintaining high availability and security. Which cloud deployment model should they consider to best meet these requirements, and what are the key benefits of this model in the context of Cisco solutions?

Accepted Answer

Public Cloud

Question 12

A company is developing a web application that integrates with multiple APIs to provide real-time data analytics for its users. The application needs to handle a high volume of requests efficiently while ensuring that the data is processed and displayed accurately. The development team is considering implementing a microservices architecture to achieve this goal. Which of the following best describes the advantages of using a microservices architecture in this scenario?

Accepted Answer

It allows for independent deployment and scaling of services, improving fault isolation and enabling teams to work on different components simultaneously.

Question 13

A network administrator is tasked with designing a subnetting scheme for a corporate network that requires at least 500 usable IP addresses for a department. The organization has been allocated the IP address block of 192.168.1.0/24. What subnet mask should the administrator use to accommodate the required number of usable addresses while minimizing wasted IP addresses?

Accepted Answer

255.255.255.128

Question 14

A network administrator is tasked with designing a subnetting scheme for a corporate network that requires at least 500 usable IP addresses for a department. The organization has been allocated the IP address block of 192.168.1.0/24. What subnet mask should the administrator use to accommodate the required number of usable addresses while minimizing wasted IP addresses?

Accepted Answer

255.255.255.128

Question 15

In a microservices architecture, you are tasked with designing a RESTful API for a new service that manages user profiles. The service needs to support CRUD (Create, Read, Update, Delete) operations and must be able to handle requests from multiple clients simultaneously. Given that the API will be accessed frequently, you want to ensure that it is both efficient and scalable. Which of the following design principles should you prioritize to optimize the performance and reliability of your RESTful API?

Accepted Answer

Implementing stateless interactions and using appropriate HTTP methods for each operation

Question 16

In a software development project, a team is tasked with managing user permissions across different roles. They decide to implement a set-based approach to define the permissions for each role. The roles are defined as follows: Role A has permissions {1, 2, 3, 4}, Role B has permissions {3, 4, 5, 6}, and Role C has permissions {5, 6, 7, 8}. If the team wants to determine the permissions that are unique to each role (i.e., permissions that are not shared with any other role), which of the following sets represents the unique permissions for all roles combined?

Accepted Answer

{1, 2, 7, 8}

Question 17

A software development team is working on a web application that integrates with various APIs. During the testing phase, they encounter an issue where the application intermittently fails to retrieve data from one of the APIs. The team decides to implement a systematic debugging approach to identify the root cause of the problem. Which of the following strategies should the team prioritize to effectively diagnose the issue?

Accepted Answer

Implement logging to capture API request and response details, including timestamps and error codes.

Question 18

A web service is designed to handle a maximum of 100 requests per second. To ensure that the service remains responsive and does not become overwhelmed, the development team implements rate limiting and throttling mechanisms. If the service receives 250 requests in the first second, how should the team configure the throttling policy to manage the excess requests while maintaining a smooth user experience? Assume that the team wants to allow a burst of up to 50 requests above the limit for a short duration. What would be the maximum number of requests that can be processed in the first two seconds if the throttling policy is applied correctly?

Accepted Answer

200 requests

Question 19

A web service is designed to handle a maximum of 100 requests per second. To ensure that the service remains responsive and does not become overwhelmed, the development team implements rate limiting and throttling mechanisms. If the service receives 250 requests in the first second, how should the team configure the throttling policy to manage the excess requests while maintaining a smooth user experience? Assume that the team wants to allow a burst of up to 50 requests above the limit for a short duration. What would be the maximum number of requests that can be processed in the first two seconds if the throttling policy is applied correctly?

Accepted Answer

200 requests

Question 20

A software development team is working on a new application that integrates with a third-party service via its RESTful API. They are using Postman to test the API endpoints and Swagger to generate documentation. During the testing phase, they encounter an issue where the API returns a 404 error when trying to access a specific resource. The team needs to determine the most effective way to troubleshoot this issue using the tools at their disposal. Which approach should they take to identify the root cause of the problem?

Accepted Answer

Review the API documentation in Swagger to ensure that the endpoint being called is correct and matches the expected URL structure.

Question 21

In a cloud-based application architecture, a company is implementing a microservices approach to enhance scalability and maintainability. Each microservice is designed to handle a specific business capability and communicates with other services through APIs. The company is considering how to model these services effectively to ensure optimal performance and resource utilization. If the company decides to implement a service model that includes both synchronous and asynchronous communication patterns, which of the following considerations should be prioritized to ensure efficient service interactions and minimize latency?

Accepted Answer

Implementing a message broker for asynchronous communication to decouple services and allow for load balancing.

Question 22

A smart city initiative is being implemented to enhance urban living through IoT devices. The city plans to deploy a network of sensors to monitor traffic flow, air quality, and energy consumption. Each sensor generates data every minute, and the city expects to deploy 500 sensors across various locations. If each sensor generates 250 KB of data per minute, what is the total amount of data generated by all sensors in one day (24 hours)?

Accepted Answer

180,000,000 KB

Question 23

In a software development project, a team is tasked with managing user permissions across different roles. They decide to use sets to represent the permissions assigned to each role. Role A has permissions represented by the set $ P_A = \{1, 2, 3, 4\} $ and Role B has permissions represented by the set $ P_B = \{3, 4, 5, 6\} $. If the team wants to determine the permissions that are unique to Role A, which operation should they perform on these sets, and what will be the resulting set of unique permissions for Role A?

Accepted Answer

$ P_A - P_B = \{1, 2\} $

Question 24

In a cloud infrastructure setup, a DevOps engineer is tasked with automating the deployment of a multi-tier application using Terraform and Ansible. The application consists of a web server, an application server, and a database server. The engineer decides to use Terraform to provision the infrastructure and Ansible to configure the servers. If the engineer needs to ensure that the application server is only provisioned after the web server is up and running, which approach should be taken to manage the dependencies effectively?

Accepted Answer

Use Terraform's `depends_on` argument to specify that the application server depends on the web server.

Question 25

In a corporate network, a network engineer is tasked with configuring VLANs to segment traffic for different departments: Sales, Engineering, and HR. Each department requires its own VLAN for security and performance reasons. The engineer decides to implement trunking between switches to allow VLAN traffic to flow across multiple switches. If the Sales department is assigned VLAN 10, Engineering VLAN 20, and HR VLAN 30, what is the correct configuration for the trunk ports to ensure that all VLANs can communicate across the switches while maintaining their segmentation?

Accepted Answer

Configure the trunk ports to allow VLANs 10, 20, and 30.

Question 26

In a Cisco ACI environment, you are tasked with designing a multi-tenant application deployment that requires specific policies for both security and performance. You need to ensure that each tenant\'s application can communicate with its own services while being isolated from other tenants. Additionally, you want to implement a policy that allows for dynamic scaling of resources based on application load. Which approach would best achieve these requirements while adhering to Cisco ACI\'s principles of application-centric networking?

Accepted Answer

Utilize Endpoint Groups (EPGs) to define tenant applications and apply contracts to control communication between EPGs, while leveraging Service Graphs for dynamic scaling of services.

Question 27

A financial institution is implementing a new data protection strategy to comply with the General Data Protection Regulation (GDPR). They need to ensure that personal data is encrypted both at rest and in transit. The institution decides to use AES (Advanced Encryption Standard) for data at rest and TLS (Transport Layer Security) for data in transit. If the institution has 10 TB of data that needs to be encrypted at rest using AES with a key size of 256 bits, and they expect to transmit 500 GB of data daily over a secure channel using TLS, what is the minimum key length required for AES encryption to ensure compliance with GDPR\'s data protection principles, and how does this relate to the security of data in transit?

Accepted Answer

256 bits for AES and TLS with a minimum of 128 bits

Question 28

A software development team is implementing a Continuous Integration/Continuous Deployment (CI/CD) pipeline using Jenkins. They want to ensure that their builds are not only automated but also efficient in terms of resource usage. The team decides to configure Jenkins to run builds in parallel across multiple agents. They have a total of 10 agents available, and each build takes approximately 30 minutes to complete. If the team has 5 different projects that need to be built, what is the minimum time required to complete all builds if they run them in parallel?

Accepted Answer

30 minutes

Question 29

In the context of API documentation best practices, a software development team is preparing to release a new API for a cloud-based service. They want to ensure that their documentation is comprehensive and user-friendly. Which of the following practices should they prioritize to enhance the usability and clarity of their API documentation?

Accepted Answer

Providing clear examples of API requests and responses, including edge cases and error handling scenarios.

Question 30

A software development team is implementing Test-Driven Development (TDD) for a new feature in their application. They have identified a requirement to calculate the area of a rectangle, which is defined by its length and width. The team writes a test case first, which checks if the area calculation function returns the correct value when given specific inputs. After running the test, they realize that the function is not yet implemented. The team then proceeds to write the minimal code necessary to pass the test. If the length of the rectangle is 5 units and the width is 3 units, what should the function return to pass the test?

Accepted Answer

15

CISCO 200-901 Developing Applications and Automating Workflows using Cisco Core Platforms (DEVASC) Free Practice Test — 30 Questions

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