Alankit Senior Systems Engineer Interview Questions and Answers

There is a medium level questions.

Q1. What Is a VPN?
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A VPN, or Virtual Private Network, is a secure connection between a user and a private network over the internet.
• Encrypts data to ensure privacy and security

• Allows users to access network resources remotely

• Masks IP address to maintain anonymity

• Commonly used for remote work, accessing geo-blocked content, and enhancing online security

• Examples include NordVPN, ExpressVPN, and OpenVPN
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Q2. What is a IP addresses?
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Q1. Basic network and os related questions
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Q1. Pagination in SQL
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Pagination in SQL allows for displaying a subset of query results at a time.
• Use LIMIT and OFFSET clauses in SQL queries to implement pagination.

• LIMIT specifies the maximum number of rows to return.

• OFFSET specifies the number of rows to skip before starting to return rows.
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Q2. OOPS concepts.. SOILD design principles
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Q3. Thread vs task in multiprocessing.. explain with examples
Ans. 
Threads and tasks are both used in multiprocessing, but have different characteristics and use cases.
• Threads are lightweight processes within a single process, sharing memory space. They are managed by the operating system.

• Tasks are units of work that can be executed asynchronously. They are typically managed by a task scheduler.

• Threads are suitable for parallel processing and improving performance, while tasks are use...read more
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Q4. ViewBag vs Tempdata in MVC
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ViewBag is used to pass data from controller to view, while TempData is used to pass data between controller actions.
• ViewBag is a dynamic property that allows you to pass data from controller to view

• TempData is a dictionary object that allows you to pass data between controller actions

• ViewBag is not type-safe and requires typecasting, while TempData is type-safe

• ViewBag data is lost if redirection occurs, while TempData...read more
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Q5. Abstract vs Interface
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Abstract classes can have both abstract and non-abstract methods, while interfaces can only have abstract methods.
• Abstract classes can have constructors, fields, and non-abstract methods.

• Interfaces can only have abstract methods and constants.

• A class can implement multiple interfaces but can only inherit from one abstract class.
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Q1. Sql based questions, oops concepts, project related questions
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Q2. Recursion, Python, MVC, AWS services
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Q1. What is the difference between normal and arrow functions
Ans. 
Arrow functions are more concise and have a lexical 'this' binding compared to normal functions.
• Arrow functions do not have their own 'this' keyword, they inherit it from the parent scope.

• Arrow functions do not have their own 'arguments' object.

• Arrow functions cannot be used as constructors with 'new'.

• Arrow functions are more concise and have implicit return when no curly braces are used.
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Q2. All basic JS Questions to cover Hoisting closure
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Q3. They asked to show me an example using the API call
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Demonstrating an API call using JavaScript's Fetch API to retrieve data from a public API.
• Use the Fetch API to make a GET request: fetch('https://api.example.com/data')

• Handle the response with .then() to convert it to JSON: .then(response => response.json())

• Use async/await for cleaner syntax: const response = await fetch('https://api.example.com/data');

• Handle errors with .catch() to manage any issues during the API ...read more
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Q4. Difference between forEach and Map
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forEach is used to iterate over an array and perform a function on each element, while map creates a new array by applying a function to each element.
• forEach does not return a new array, while map does

• forEach does not modify the original array, while map creates a new array

• forEach is used for side effects, while map is used for transformation

• Example: forEach - array.forEach(item => console.log(item)), map - const newAr...read more
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Q1. Tell me your project details
Ans. 
Developed a web application for online shopping with user authentication and payment gateway integration.
• Used React.js for front-end development

• Implemented user authentication using JWT tokens

• Integrated Stripe API for payment processing
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Q1. Oops concepts explained
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Q1. Optimization Techniques
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Optimization techniques are methods used to improve the efficiency and performance of software applications.
• Use of algorithms like dynamic programming and greedy algorithms

• Profiling and performance tuning to identify bottlenecks

• Code refactoring to improve readability and maintainability

• Utilizing caching and memoization for faster access to data

• Parallel processing and multi-threading for improved concurrency
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Google

Q1. Count frequency of letters in a given string
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Q2. Closures, Temporal Dead Zone, Hoisting
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Q1. Technical Discussions on projects from resume and work
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Q2. Refresh tokens and access tokens, rate limiter
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