Tech Support Interview Questions and Answers

Updated 25 Jan 2025

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Q1. What is array and how to modify it in js?

Ans.

An array is a data structure that stores a collection of elements, and in JavaScript, you can modify it by adding, removing, or updating elements.

Use array methods like push(), pop(), shift(), unshift(), splice(), and slice() to modify arrays in JavaScript.
Example: let fruits = ['apple', 'banana', 'orange']; fruits.push('grape'); // adds 'grape' to the end of the array
Example: let numbers = [1, 2, 3, 4, 5]; numbers.splice(2, 1, 6); // replaces element at index 2 with 6

Q2. Brief introduction? What is applications? What is technica support? What is CRM? ETC.

Ans.

Applications are computer programs designed to perform specific tasks. Technical support is the assistance provided to users of technology products. CRM stands for Customer Relationship Management, which is a strategy for managing interactions with customers.

Applications are software programs that perform specific tasks, such as word processing, email, or gaming.
Technical support is the assistance provided to users of technology products, such as troubleshooting, installation...read more

Q3. subnet mask and why do we use it

Ans.

Subnet mask is used to divide a network into subnetworks for better organization and security.

Subnet mask is a 32-bit number that separates the network portion and host portion of an IP address.
It is used to determine which part of an IP address belongs to the network and which part belongs to the host.
Subnetting allows for better organization of network resources and improves security by isolating different parts of the network.
For example, a subnet mask of 255.255.255.0 mea...read more

Q4. How do you make an calculator in js

Ans.

To create a calculator in JavaScript, you can use HTML for the layout and JavaScript for the functionality.

Create a basic HTML structure with input fields for numbers and buttons for operations.
Use JavaScript to handle user input, perform calculations, and display results.
Implement functions for addition, subtraction, multiplication, and division.
Update the display with the result of the calculation when the user clicks the equals button.

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Q5. What are callback functions

Ans.

Callback functions are functions passed as arguments to other functions, to be executed later.

Callback functions are commonly used in asynchronous programming to handle events or responses.
They allow for more flexible and modular code by separating concerns.
An example of a callback function is the 'setTimeout' function in JavaScript.

Q6. What types of ip adress

Ans.

There are two types of IP addresses - IPv4 and IPv6.

IPv4 addresses are 32-bit numerical addresses written in the format of four sets of numbers separated by periods (e.g. 192.168.1.1)
IPv6 addresses are 128-bit hexadecimal addresses written in the format of eight groups of four hexadecimal digits separated by colons (e.g. 2001:0db8:85a3:0000:0000:8a2e:0370:7334)

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Q7. What is bios

Ans.

BIOS stands for Basic Input/Output System. It is a firmware that initializes hardware during the boot process.

BIOS is responsible for performing a Power-On Self Test (POST) to check if all hardware components are functioning properly.
It also provides a platform for the operating system to communicate with the hardware.
BIOS settings can be accessed and modified through a setup utility during boot time.
BIOS has been replaced by UEFI (Unified Extensible Firmware Interface) in mo...read more

Q8. What is ip adress

Ans.

An IP address is a unique numerical label assigned to each device connected to a computer network.

IP address stands for Internet Protocol address.
It is used to identify and locate devices on a network.
There are two types of IP addresses - IPv4 and IPv6.
IPv4 addresses are written in the format xxx.xxx.xxx.xxx, where each 'xxx' can be a number from 0 to 255.
IPv6 addresses are written in a longer format with hexadecimal characters.