CETPA InfoTech PLC Programmer Interview Questions and Answers

Q1. What is VPN virtual private network?
Ans. 
VPN is a secure connection between two or more devices over the internet.
• VPN encrypts data to ensure privacy and security

• It allows remote access to a private network

• It can be used to bypass geo-restrictions and access blocked content

• Examples include OpenVPN, Cisco AnyConnect, and NordVPN
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Q2. Specifications about ping cmd
Ans. 
Ping cmd is a network diagnostic tool used to test connectivity between two devices.
• Ping sends ICMP packets to the destination device and measures the response time.

• It can be used to test network latency, packet loss, and network congestion.

• Ping can also be used to determine the IP address of a device.

• Ping can be run from the command prompt on Windows, macOS, and Linux systems.

• Ping can be used with various options such...read more
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Q3. Explain how to dual boot system
Ans. 
Dual booting allows two operating systems to be installed on one computer, giving the user the option to choose which to use.
• Create a separate partition for each operating system

• Install the first operating system on one partition

• Install the second operating system on the other partition

• Use a boot manager to choose which operating system to boot into

• Examples of boot managers include GRUB and Windows Boot Manager
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Q4. What is virtual machine
Ans. 
A virtual machine is a software emulation of a physical computer that can run multiple operating systems and applications.
• Virtual machines allow for efficient use of hardware resources by sharing them among multiple virtual machines

• They provide a secure and isolated environment for running applications

• Virtual machines can be easily created, cloned, and moved between physical hosts

• Examples of virtual machine software in...read more
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Q1. Basic Networking Concepts like OSl/TCP/IP models. Basic protocols.
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Q2. Current Windows and Android OS info with their differences from the past versions.
Ans. 
Windows and Android OS have evolved with new features and improvements compared to past versions.
• Windows 10 introduced a new Start menu and Cortana virtual assistant.

• Android 11 focused on improved privacy controls and messaging features.

• Both OS have enhanced security measures compared to their past versions.
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Q1. Networking Questions about devices and their functionality.
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Q2. Deep networking topics like Subnetting, NAT and their working.
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Q1. This a one-on-one final round with director. He himself was systems Engineer. Expect deep networking concept questions.
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In first round the hiring team provide you a question of pattern printing.

Q1. What do you understand from OOP's?
Ans. 
OOP stands for Object-Oriented Programming, a programming paradigm based on the concept of objects.
• OOP focuses on creating objects that contain both data and methods to manipulate that data.

• Encapsulation, inheritance, and polymorphism are key principles of OOP.

• Examples of OOP languages include Java, C++, and Python.
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Q2. What is js callback function and reference objects?
Ans. 
A callback function in JavaScript is a function passed as an argument to another function to be executed later. Reference objects in JavaScript are objects that store references to other objects.
• Callback functions are commonly used in event handling, asynchronous programming, and AJAX requests.

• Reference objects in JavaScript include arrays, functions, and objects.

• Example of a callback function: setTimeout(function(){ c...read more
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Q3. Some queries on sql.
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Q1. Introduce yourself?
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Q2. Why do you want to join webkul?
Ans. 
I want to join webkul because of their reputation for innovative solutions and strong focus on professional growth.
• Webkul is known for their innovative solutions in the software development industry

• I am impressed by their strong focus on professional growth and learning opportunities

• I believe working at webkul will provide me with a challenging and rewarding environment to enhance my skills
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Q3. What do you know about the job role and the technology?
Ans. 
Software Developer Trainee involves learning and applying programming skills to develop software applications.
• Developing and testing software applications

• Learning programming languages and technologies

• Collaborating with team members on projects

• Troubleshooting and debugging code

• Participating in training programs and workshops
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SQL questions and query output.

Q1. I had interview on SQL and pl SQL. So the interview started with basic sql questions and then level increased. Question were asked on joins, union, rank, dense rank. Indexes, triggers. I was asked to ri...read more
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Round duration - 30 minutes
Round difficulty - Medium

This was a MCQ round. 30 ques in 30 mins consisting of difficult quantitative aptitude questions were to be solved.

Round duration - 60 minutes
Round difficulty - Medium

In this test round, 2 coding questions were given. Either write the code or pseudo code

Q1. 
N Queens Problem
Given an integer N, find all possible placements of N queens on an N x N chessboard such that no two queens threaten each other.
Explanation:
A queen can attack another queen if they ar...read more
Ans. 
The N Queens Problem involves finding all possible placements of N queens on an N x N chessboard without threatening each other.
• Use backtracking algorithm to explore all possible configurations.

• Keep track of rows, columns, and diagonals to ensure queens do not threaten each other.

• Generate all valid configurations and print them out.
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Q2. 
Sort 0 1 2 Problem Statement
Given an integer array arr of size 'N' containing only 0s, 1s, and 2s, write an algorithm to sort the array.
Input:
The first line contains an integer 'T' representing the n...read more
Ans. 
Sort an array of 0s, 1s, and 2s in linear time complexity.
• Use three pointers to keep track of 0s, 1s, and 2s while traversing the array.

• Swap elements based on the values encountered to sort the array in-place.

• Time complexity should be O(N) and space complexity should be O(1).
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Round duration - 60 minutes
Round difficulty - Easy

This was a technical round with questions on DSA.

Q1. 
Reverse Words in a String: Problem Statement
You are given a string of length N. Your task is to reverse the string word by word. The input may contain multiple spaces between words and may have leading o...read more
Ans. 
Reverse words in a string while handling leading, trailing, and multiple spaces.
• Split the input string by spaces to get individual words

• Reverse the order of the words

• Join the reversed words with a single space in between
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Q2. 
Circular Linked List Detection
You are provided with the head of a linked list containing integers. Your task is to determine if the linked list is circular.
Note:
• A linked list is considered circula...read more
Ans. 
Detect if a given linked list is circular by checking if it forms a closed loop.
• Traverse the linked list using two pointers, one moving at double the speed of the other.

• If the two pointers meet at any point, the linked list is circular.

• If the faster pointer reaches the end of the list (NULL), the linked list is not circular.
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Round duration - 30 minutes
Round difficulty - Easy

HR round with typical behavioral problems.