Epsilon Technical Support Engineer Interview Questions and Answers

Q1. What is JavaScript
Ans. 
JavaScript is a programming language used to add interactivity and dynamic features to websites.
• JavaScript is a client-side scripting language.

• It is primarily used for web development.

• JavaScript can be embedded directly into HTML pages.

• It allows for the manipulation of webpage elements and handling of events.

• Common uses include form validation, creating interactive content, and AJAX requests.
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Q2. What is closure
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Closure is a programming concept that allows a function to access variables from its parent scope even after the parent function has finished executing.
• Closure is created when a nested function references a variable from its outer function.

• The inner function can access and modify the variables from the outer function.

• Closure helps in encapsulating data and creating private variables in JavaScript.

• It allows functions to...read more
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Q3. Explain map method
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The map method is used to create a new array by applying a function to each element of an existing array.
• The map method takes a callback function as an argument.

• The callback function is executed on each element of the array.

• The result of the callback function is added to the new array.

• The map method does not modify the original array.

• Example: ['apple', 'banana', 'cherry'].map(fruit => fruit.toUpperCase()) returns ['APP
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Q4. What is react.js
Ans. 
React.js is a JavaScript library for building user interfaces.
• React.js is used for creating reusable UI components.

• It follows a component-based architecture.

• React.js uses a virtual DOM for efficient rendering.

• It allows for declarative and efficient updates to the UI.

• React.js is widely used in web development for building interactive and dynamic user interfaces.
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Q5. Explain promise in JavaScript
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A promise in JavaScript is an object representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations such as fetching data from a server or reading a file.

• They provide a cleaner and more readable way to write asynchronous code compared to using callbacks.

• Promises have three states: pending, fulfilled, or rejected.

• They can be chained using the then() metho...read more
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Q1. Tell me about yourself
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Q2. Last working experience
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Q1. DHCP DNS ACTIVE DIRECTORY
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Q2. Tell me about your job roles
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Q3. How do you troubleshoot system slowness issue
Ans. 
To troubleshoot system slowness, check for resource usage, run diagnostic tools, update software, and optimize settings.
• Check CPU, memory, and disk usage to identify any bottlenecks

• Run diagnostic tools like Task Manager, Resource Monitor, or Performance Monitor

• Update software and drivers to ensure compatibility and performance

• Optimize system settings such as startup programs, background processes, and power settings
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Grammar and spelling

Q1. What is a DNS DHCP networking troubleshoot active directory
Ans. 
DNS, DHCP, networking, troubleshooting, and Active Directory are all related to managing and troubleshooting network services and infrastructure.
• DNS (Domain Name System) is responsible for translating domain names into IP addresses.

• DHCP (Dynamic Host Configuration Protocol) is used to automatically assign IP addresses to devices on a network.

• Networking involves the design, implementation, and management of computer net...read more
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Q2. Tell me something about your self
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Q1. Why should hire you what is accepted CTC
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First of all you need to clear the aptitude test and after you will be able to go next round it is not main face but it is qualifying nature.

When you cleared the fiirst round aptitute test then you will go to next level of proces its GD, GD is nothing but they wants to check your confidence in public speaking your communication and how you can expallin your concern in fron of board memebers and other palces then after next face is Technical round it is totally techincal based then you clear technical round means 80% selected and finally HR round about your salary and accomodation related query in this round.

Q1. Already disussed it is purely based on techical knowledge your your stream.
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Q2. Always first question your introduction and that is very important to give your best bcz. "First impression is the last impression" always remember.
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Q1. How much salary you want to expact
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Q2. Accomodations and TA DA and other allowance and preffered city for the jobs
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