You're experiencing slow performance on a web page. How would you utilize Browser Developer Tools to diagnose and address the issue?
- Check the Network tab for slow-loading resources, analyze waterfall charts, and identify bottlenecks
- Inspect the Elements panel for layout issues
- Monitor the Performance tab for memory leaks
- Use the Console tab to debug JavaScript code
When experiencing slow performance, the Network tab in Browser Developer Tools helps identify slow-loading resources, analyze waterfall charts, and pinpoint bottlenecks causing the issue.
Which of the following is not a primitive data type in JavaScript?
- boolean
- number
- object
- string
In JavaScript, object is not a primitive data type. It is a complex data type used to store collections of key-value pairs. The primitive data types are number, boolean, and string.
A well-designed logging system should provide _______.
- Log Rotation
- Encryption
- Anonymization
- All of the above
A well-designed logging system should provide log rotation to manage log file sizes, encryption for securing sensitive information, and anonymization to protect user privacy. Hence, all the options are essential features of a robust logging system.
Which tool is often used to automate the building and testing stages in CI/CD pipelines?
- Docker
- Gradle
- Jenkins
- Travis CI
Jenkins is often used to automate the building and testing stages in CI/CD pipelines. It is an open-source automation server that supports building, deploying, and automating any project.
What is a Git rebase used for?
- Combining or integrating branches
- Creating a new branch
- Inspecting changes made in a branch
- Undoing changes in the working directory
Git rebase is used for combining or integrating branches. It allows you to apply a sequence of commits from one branch onto another, helping to maintain a linear project history. This is particularly useful for keeping feature branches up to date with the latest changes in the main branch.
You're tasked with deploying a new version of an application without downtime. Explain how you would accomplish this using Kubernetes' rolling updates feature.
- Gradually replace old pods with new ones
- Manually update each pod individually
- Rollback to the previous version in case of issues
- Stop all old pods and start the new ones simultaneously
Kubernetes' rolling updates feature allows for the seamless deployment of a new version without downtime. It achieves this by gradually replacing the old pods with the new ones, ensuring a smooth transition and enabling easy rollback in case of issues.
In a CI/CD pipeline, the process of automatically deploying changes to production after passing tests is known as Continuous _______.
- Delivery
- Deployment
- Integration
- Testing
Continuous Deployment (CD) is the process of automatically deploying code changes to production after they have passed all necessary tests in the CI/CD pipeline. This ensures a smooth and efficient release process.
You're working on a web application where user authentication is crucial. How would you handle authentication errors securely?
- Implementing OAuth2 with JWT tokens
- Sending authentication details in query parameters
- Storing plaintext passwords in the database
- Using HTTP basic authentication
Implementing OAuth2 with JWT tokens is a secure method for handling authentication errors. OAuth2 provides a standardized framework for authentication, and JWT tokens add an extra layer of security by encoding information.
Database _______ is the process of ensuring that data in a database remains accurate and consistent over time.
- Maintenance
- Normalization
- Optimization
- Security
Database maintenance is the process of ensuring that data in a database remains accurate and consistent over time. It involves tasks such as backups, performance monitoring, and data integrity checks.
What is the purpose of the HTTP PATCH method in RESTful APIs?
- Creates a new resource
- Deletes a resource
- Partially updates a resource
- Retrieves a resource
The HTTP PATCH method in RESTful APIs is used to partially update a resource. It applies partial modifications to a resource, making it suitable for updating specific fields.
A web application you're working on is vulnerable to SQL injection attacks. How would you mitigate this risk?
- All of the above
- Escaping user input
- Implement input validation
- Use parameterized queries
Mitigating SQL injection risks requires best practices like using parameterized queries, escaping user input, and implementing input validation. Parameterized queries are particularly effective in preventing SQL injection by separating data from SQL code.