CISCO 350-901 Developing Applications using Cisco Core Platforms and APIs v1.0 Free Practice Test — 30 Questions

Question 1

In a web application that processes user data, you are required to choose between JSON and XML for data interchange. The application needs to handle a large volume of data, including nested structures, and must ensure efficient parsing and serialization. Given these requirements, which data format would be more suitable for this scenario, and what are the implications of your choice on performance and data handling?

Accepted Answer

JSON

Question 2

In a microservices architecture, a developer is tasked with designing a RESTful API for a new service that manages user profiles. The API must support CRUD (Create, Read, Update, Delete) operations and should adhere to REST principles. The developer decides to implement the following endpoints:

Accepted Answer

OST /users

Question 3

In a software development project utilizing Agile methodologies, a team is tasked with delivering a product increment every two weeks. During a sprint retrospective, the team identifies that their velocity has been fluctuating significantly, with some sprints delivering 20 story points and others only 5. The team decides to implement a new practice to stabilize their velocity. Which approach would most effectively help the team achieve a more consistent velocity while adhering to Agile principles?

Accepted Answer

Implementing a more rigorous definition of "done" to ensure that all work is fully completed before it is considered finished.

Question 4

A network engineer is tasked with automating the configuration of multiple routers in a large enterprise network using Python and the Cisco IOS XE REST API. The engineer needs to ensure that the configuration changes are applied only if the current configuration matches a predefined template. The engineer writes a script that retrieves the current configuration, compares it to the template, and applies the changes if they differ. Which of the following best describes the key concepts and practices the engineer should implement to ensure the automation process is efficient and reliable?

Accepted Answer

Implement a version control system for the configuration templates and use a diff tool to compare configurations before applying changes.

Question 5

A company is experiencing intermittent performance issues with its web application, which is hosted on a cloud platform. The application is designed to handle a peak load of 500 concurrent users, but during peak hours, the response time exceeds acceptable limits. The development team has implemented logging and monitoring tools to track application performance metrics. Which approach should the team take to effectively identify the root cause of the performance degradation?

Accepted Answer

Analyze the application logs for error messages and performance bottlenecks, and correlate these findings with the monitoring metrics to identify patterns during peak load times.

Question 6

A company has developed an API that allows users to retrieve data from their database. To ensure fair usage and prevent abuse, the company implements a rate limiting policy that allows each user to make a maximum of 100 requests per hour. If a user exceeds this limit, they will receive a 429 Too Many Requests response. After implementing this policy, the company notices that some users are still able to make more than 100 requests within the hour. Upon investigation, they find that these users are employing multiple API keys to circumvent the limit. To address this issue, the company decides to implement a more sophisticated throttling mechanism that tracks usage per user account rather than per API key. Which of the following strategies would best help the company enforce this new throttling policy effectively?

Accepted Answer

Implement a centralized user authentication system that associates all API keys with a single user account and tracks the total number of requests made across all keys.

Question 7

In a microservices architecture, you are tasked with developing a service that processes user data and generates reports. The service is built using Python and Flask, and it needs to handle concurrent requests efficiently. You decide to implement asynchronous programming to improve performance. Which of the following approaches would best facilitate this requirement while ensuring that the service remains responsive under high load?

Accepted Answer

Utilize the `asyncio` library along with `aiohttp` for handling asynchronous HTTP requests.

Question 8

A multinational retail company has recently deployed a Cisco-based application to enhance its supply chain management. The application integrates real-time data analytics, IoT devices for inventory tracking, and a cloud-based platform for data storage. After the deployment, the company noticed a 30% reduction in inventory costs and a 25% increase in order fulfillment speed. Considering the principles of application deployment and the impact of Cisco technologies, which of the following factors most significantly contributed to these improvements in operational efficiency?

Accepted Answer

The integration of IoT devices that provide real-time visibility into inventory levels and automate reordering processes.

Question 9

In a microservices architecture utilizing Istio as a service mesh, a developer is tasked with implementing traffic management policies to ensure that 80% of the traffic is directed to the stable version of a service while 20% is routed to a canary version for testing purposes. Given that the total incoming traffic to the service is 1,000 requests per minute, how should the developer configure the virtual service to achieve this traffic split?

Accepted Answer

Set the weight of the stable version to 80 and the canary version to 20.

Question 10

In a scenario where a network engineer is tasked with automating the provisioning of network devices using Cisco DNA Center APIs, they need to understand the role of the Cisco DNA Center\'s RESTful APIs in managing device lifecycle. If the engineer wants to create a new device template for a set of routers, which of the following steps should they prioritize to ensure a successful deployment?

Accepted Answer

Utilize the "Device Template" API to define the configuration parameters and associate them with the target devices.

Question 11

A smart city initiative is being implemented to enhance urban infrastructure using IoT devices. The city plans to deploy a network of sensors to monitor traffic flow, air quality, and energy consumption. Each sensor is expected to generate data at a rate of 100 KB per minute. If the city deploys 500 sensors, calculate the total amount of data generated by all sensors in one day. Additionally, consider the implications of this data volume on network bandwidth and storage solutions. Which of the following statements best describes the challenges and considerations the city must address regarding data management and IoT deployment?

Accepted Answer

The city must ensure that its network can handle a data throughput of approximately 72 GB per day, necessitating robust bandwidth and storage solutions to manage the influx of data effectively.

Question 12

In a web application that processes user input for a financial transaction, a developer is tasked with implementing secure coding practices to prevent injection attacks. The application accepts user input for transaction amounts, which are then processed and stored in a database. The developer must ensure that the input is validated and sanitized before any processing occurs. Which of the following practices should the developer prioritize to mitigate the risk of SQL injection attacks effectively?

Accepted Answer

Implement parameterized queries to handle user input safely.

Question 13

In a web application that processes sensitive user data, a developer is tasked with implementing secure coding practices to mitigate the risk of SQL injection attacks. The application uses a relational database and accepts user input through a web form. Which approach should the developer prioritize to ensure the security of the application against such vulnerabilities?

Accepted Answer

Utilize prepared statements with parameterized queries for all database interactions.

Question 14

In a scenario where a developer is tasked with integrating a Cisco API into an existing application to enhance its functionality, they need to ensure that the API calls are efficient and secure. The developer decides to implement OAuth 2.0 for authentication and is considering the best practices for managing access tokens. Which of the following strategies should the developer prioritize to ensure both security and performance in their application?

Accepted Answer

Implement short-lived access tokens with a refresh token mechanism to minimize the risk of token theft while maintaining user sessions.

Question 15

In a software development project utilizing Agile methodologies, a team is tasked with delivering a new feature within a two-week sprint. The team has identified three user stories with the following estimated story points: Story A is worth 5 points, Story B is worth 3 points, and Story C is worth 2 points. If the team can commit to a maximum of 8 story points per sprint, which combination of user stories should the team select to maximize their output while ensuring they do not exceed the sprint capacity?

Accepted Answer

Story A and Story B

Question 16

In a scenario where a developer is utilizing the Cisco DevNet Sandbox to test an application that integrates with Cisco\'s APIs, they need to ensure that their application can handle rate limiting effectively. The developer is aware that the API has a limit of 100 requests per minute. If the application sends 250 requests in the first minute, how should the developer implement a strategy to manage the excess requests in subsequent minutes while adhering to the rate limit?

Accepted Answer

Implement exponential backoff to space out the requests over the next few minutes.

Question 17

In a software development environment utilizing Continuous Integration/Continuous Deployment (CI/CD) practices, a team is tasked with automating their deployment pipeline. They decide to implement a CI/CD tool that integrates with their version control system and allows for automated testing, building, and deployment of their applications. The team is considering various tools and practices to ensure that their pipeline is efficient and reliable. Which of the following practices is most critical to ensure that the deployment process is both automated and minimizes the risk of introducing errors into production?

Accepted Answer

Implementing automated testing at multiple stages of the pipeline, including unit tests, integration tests, and end-to-end tests.

Question 18

In a microservices architecture, a company is transitioning from a monolithic application to a microservices-based system. They have identified several services that need to be developed independently, including user authentication, product catalog, and order processing. Each service will be deployed in a containerized environment using Kubernetes. Given this scenario, which of the following considerations is most critical for ensuring effective communication between these microservices?

Accepted Answer

Implementing an API Gateway to manage requests and route them to the appropriate services

Question 19

In a Python application designed to interact with Cisco devices via REST APIs, you need to implement a function that retrieves device information based on a given device ID. The function should handle potential errors, such as network timeouts and invalid responses. Which of the following best describes how you would structure this function to ensure robust error handling and effective data retrieval?

Accepted Answer

Use a try-except block to catch exceptions during the API call, and implement a retry mechanism with exponential backoff for network timeouts, while validating the response status code to ensure it is 200 before processing the data.

Question 20

In a smart city initiative, a municipality is exploring the integration of Internet of Things (IoT) devices to enhance urban infrastructure. They plan to deploy sensors for traffic management, waste management, and environmental monitoring. Given the potential data generated from these devices, which of the following approaches would best ensure effective data management and utilization while addressing privacy concerns?

Accepted Answer

Implementing a centralized data management system with strict access controls and anonymization techniques for personal data.

Question 21

In a cloud-based application architecture, a company is evaluating the use of Cisco Cloud Services to enhance its operational efficiency and scalability. The application is expected to handle variable workloads, requiring dynamic resource allocation. Which of the following best describes the primary benefit of utilizing Cisco Cloud Services in this scenario?

Accepted Answer

Enhanced scalability and flexibility in resource management

Question 22

In a large organization, a project team is utilizing a collaboration tool to manage their tasks and communicate effectively. The team consists of members from different departments, each with varying levels of access to sensitive information. The project manager needs to ensure that the collaboration tool allows for secure communication while also enabling efficient task management. Which of the following features is most critical for achieving both security and efficiency in this scenario?

Accepted Answer

Role-based access control (RBAC)

Question 23

In a microservices architecture utilizing a service mesh like Istio, a developer is tasked with implementing traffic management to ensure that 80% of the traffic is directed to the stable version of a service while 20% is routed to a new version for canary testing. The developer needs to configure the virtual service to achieve this traffic split. What is the most effective way to define the routing rules in the Istio configuration to accomplish this?

Accepted Answer

Define a virtual service with two destination rules, specifying the weight for the stable version as 80 and the canary version as 20.

Question 24

In a microservices architecture, a developer is tasked with implementing error handling for a service that processes user transactions. The service must ensure that any exceptions thrown during the transaction processing are logged and that the system can recover gracefully without losing data. The developer considers several strategies for managing exceptions. Which approach best balances robustness and maintainability while adhering to best practices in error handling?

Accepted Answer

Implement a centralized error handling middleware that captures exceptions, logs them, and returns a standardized error response to the client while allowing the transaction to be retried later.

Question 25

In a scenario where a developer is tasked with integrating Cisco\'s DNA Center API into an existing network management application, they need to ensure that the application can effectively retrieve device information and manage network configurations. The developer must choose the appropriate authentication method to securely access the API. Which authentication method should the developer implement to ensure secure and efficient access to the Cisco DNA Center API?

Accepted Answer

OAuth 2.0

Question 26

In a microservices architecture, a company is implementing a new feature that requires communication between multiple services. The development team is considering various design patterns to ensure efficient and reliable communication. Which design pattern would best facilitate asynchronous communication between services while also providing resilience against service failures?

Accepted Answer

Event Sourcing

Question 27

In a Node.js application, you are tasked with implementing a function that calculates the factorial of a number using recursion. The function should also handle cases where the input is not a positive integer. Given the following code snippet, which option correctly identifies the output of the function when the input is 5, and explains the behavior of the function when the input is invalid?

Accepted Answer

javascript

Question 28

In a large enterprise network, a network engineer is tasked with automating the configuration of multiple Cisco routers using Ansible. The engineer needs to ensure that the configurations are consistent across all devices and that any changes are logged for auditing purposes. Which approach should the engineer take to effectively implement this automation while adhering to best practices in network automation?

Accepted Answer

Use Ansible playbooks to define the desired state of the router configurations and implement version control for the playbooks in a Git repository.

Question 29

A software development team is tasked with creating a RESTful API for a new application that manages inventory for a retail store. The API needs to handle various operations such as adding new items, updating existing items, retrieving item details, and deleting items. The team decides to implement the API using the principles of REST. Which of the following best describes how the team should structure the API endpoints to adhere to RESTful principles while ensuring that they are intuitive and maintainable?

Accepted Answer

Use nouns to represent resources in the URL, such as `/items`, and utilize HTTP methods (GET, POST, PUT, DELETE) to define the actions on those resources.

Question 30

A company is developing a new application that processes user data in real-time and requires high scalability and low latency. They are considering using serverless computing to handle the backend services. Given the characteristics of serverless architectures, which of the following statements best describes the advantages and potential challenges of adopting serverless computing for this application?

Accepted Answer

Serverless computing allows for automatic scaling based on demand, but it may introduce cold start latency issues for infrequently accessed functions.

CISCO 350-901 Developing Applications using Cisco Core Platforms and APIs v1.0 Free Practice Test — 30 Questions

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