Allied Digital Services L2 Engineer Interview Questions and Answers

There were simple aptitude questions and core java MCQS

Q1. What's OOPs concept
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OOP is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (object).

• Inheritance: Ability of a class to inherit properties and behavior from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding th...read more
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Q2. Explain Inheritance
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Inheritance is a concept in object-oriented programming where a class inherits properties and behaviors from another class.
• Allows a class to inherit attributes and methods from another class

• Promotes code reusability and reduces redundancy

• Creates a parent-child relationship between classes

• Derived class can override or extend the functionality of the base class

• Example: Class 'Car' can inherit from class 'Vehicle' and inh...read more
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Q3. Basic Java output questions
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Q1. Interviewer asked me to introduce and then he asked about my education and family details and then he told me about company.
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Q1. What is VTP (VLAN Trunking Protocol)?
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Q2. What actions would you take if the switch enters ROMMON mode after a reboot?
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Q1. What are closures
Ans. 
Closures are functions that have access to variables from their containing scope even after the scope has closed.
• Closures allow functions to access variables from their outer function even after the outer function has finished executing.

• They are commonly used in event handlers, callbacks, and asynchronous programming.

• Closures help in maintaining state in functional programming.
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Q2. What is virtual DOM
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Virtual DOM is a lightweight copy of the actual DOM used for efficient updates in web development.
• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing actual DOM manipulations.

• When changes are made to the virtual DOM, a comparison is done with the actual DOM to determine the minimal updates needed.

• This approach reduces the number of costly DOM operations, resulting in faster rende
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Q3. What are the data types in JS
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Data types in JavaScript include number, string, boolean, object, function, undefined, and null.
• Number - represents numeric data, e.g. 10, 3.14

• String - represents textual data, e.g. 'hello', '123'

• Boolean - represents true or false values, e.g. true, false

• Object - represents complex data structures, e.g. { key: 'value' }

• Function - represents executable code, e.g. function() { }

• Undefined - represents a variable that has ...read more
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Q1. Write react code for counter
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React code for a simple counter
• Create a functional component for the counter

• Use useState hook to manage the count state

• Render the count value and buttons to increment and decrement the count
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Q1. Salary discussion
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Q1. What is the SMTP?
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Q2. What is the RSMTP?
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Q3. Tell about TCP Rest
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Q1. Technical question
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Q2. Java oops and write a program for remove duplicates
Ans. 
Java program to remove duplicates from an array of strings using OOPs concepts.
• Create a HashSet to store unique strings.

• Iterate through the array and add each string to the HashSet.

• Convert the HashSet back to an array to get the unique strings.
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Q1. Can you introduce yourself? What are your strengths and weaknesses?
Ans. 
I am a software engineer with strong problem-solving skills and a passion for learning new technologies.
• Strengths: Strong problem-solving skills, quick learner, proficient in multiple programming languages (e.g. Java, Python), excellent communication skills

• Weaknesses: Sometimes I can be overly critical of my own work, can get too focused on details and lose sight of the bigger picture, working on improving time managem
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Q2. Do you have any relevant experience?
Ans. 
Yes, I have 5 years of experience working as a software engineer in a tech company.
• 5 years of experience as a software engineer

• Worked in a tech company

• Developed web applications using Java and JavaScript

• Experience with Agile development methodologies

• Strong problem-solving skills
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Exchange your work experiences with one another.

Q1. Technical skills related questions
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Q2. Hands on / live coding
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Q1. Deep knowledge checking for mentioned skill
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Q1. Basic angular questions
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Q2. Let, var, const event emitter, middle ware
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