What is a primary use case for MongoDB?
- Document-oriented storage
- Relational data storage
- Key-value storage
- Graph storage
MongoDB is a document-oriented database, making option 1 the correct answer. It is designed for storing, querying, and processing large amounts of unstructured data in a JSON-like format known as BSON.
What is the purpose of the Git command "git merge"?
- To combine changes from different branches
- To create a new branch
- To delete a branch
- To rename a branch
The purpose of the Git command git merge is to combine changes from different branches. It integrates changes from the specified branch into the current branch, facilitating collaboration and code integration.
In a web application, you want to fetch data from an external API asynchronously. Which JavaScript feature would you use for this purpose?
- Promise
- Callback functions
- Async/Await
- Observables
To fetch data from an external API asynchronously in a web application using JavaScript, you would use the Async/Await feature. It simplifies the asynchronous code and makes it more readable. The correct option reflects modern asynchronous programming practices.
Enabling _______ compression can reduce the size of files transferred over the network, improving overall performance.
- Gzip
- RAR
- Tar
- ZIP
Enabling Gzip compression is a common practice to reduce the size of files transferred over the network. Gzip compresses files before sending them, reducing bandwidth usage and improving overall performance.
In database systems, a _______ is a mechanism to control access to data items by multiple transactions.
- Buffer
- Lock
- Semaphore
- Trigger
In database systems, a lock is a mechanism used to control access to data items by multiple transactions. It helps in preventing conflicts and ensuring the consistency of the data during concurrent access. Locks can be applied at various levels, such as row-level, page-level, or table-level.
The HTTP _______ status code is used to indicate that the requested resource could not be found.
- 200
- 302
- 404
- 500
The HTTP 404 status code is used to indicate that the requested resource could not be found on the server. It is a standard response for an unsuccessful request.
Among the options, which language is often associated with the server-side environment in a Node.js application?
- Java
- JavaScript
- Python
- Ruby
JavaScript is often associated with the server-side environment in a Node.js application. Node.js enables server-side scripting using JavaScript.
Data _______ is a crucial step before migration to ensure data quality and compatibility.
- Cleansing
- Compression
- Encryption
- Validation
Data cleansing is a crucial step before migration to ensure data quality and compatibility. It involves identifying and correcting errors or inconsistencies in the data.
You're managing a large-scale cloud infrastructure. How would you ensure the security of your infrastructure using Infrastructure as Code principles?
- Automate security policies and configurations
- Ignore security in IaC
- Manual intervention for security
- Rely on third-party security tools
Infrastructure as Code (IaC) allows for automating security policies and configurations, ensuring consistency and reducing the risk of human error. By codifying security measures, you can enforce best practices and respond to security threats more efficiently.
What are some techniques for optimizing images in responsive design?
- Compressing images, using responsive image tags, lazy loading, and using the srcset attribute
- Embedding images directly, using high-resolution images for all devices, avoiding image compression
- Using fixed image sizes, avoiding image sprites, not considering image formats
- Using only vector graphics, not optimizing images for responsive design, relying on browser defaults
Techniques for optimizing images in responsive design include compressing images, using responsive image tags, lazy loading, and utilizing the srcset attribute for different resolutions and sizes.
Which tab in Browser Developer Tools is used to debug JavaScript code?
- Console
- Elements
- Network
- Sources
The "Sources" tab in Browser Developer Tools is used to debug JavaScript code. It allows developers to view and debug the source code of their web pages.
How does distributed tracing differ from traditional logging and monitoring?
- Distributed tracing focuses on tracking requests as they traverse various services in a microservices architecture, providing end-to-end visibility. Traditional logging captures events and errors but lacks the context of request flow. Monitoring involves tracking system metrics, often lacking detailed request-level insights.
- Distributed tracing is primarily concerned with server-side events, while traditional logging focuses on client-side interactions.
- Distributed tracing is suitable only for monolithic applications, while traditional logging and monitoring are better for microservices.
- Traditional logging and monitoring provide real-time insights, whereas distributed tracing is retrospective in nature.
Distributed tracing is designed to follow the journey of a request across services, offering a comprehensive view of its path. Traditional logging captures events without the contextual flow, and monitoring deals with system-level metrics.