Nehish Senior Product Support Engineer Interview Questions and Answers

It was Easy to medium . overall good

It was Medium to tough level

Q1. What is fifo lifo
Ans. 
FIFO (First In, First Out) and LIFO (Last In, First Out) are inventory management methods.
• FIFO: Items that are added first are the first to be removed. Like a queue.

• LIFO: Items that are added last are the first to be removed. Like a stack.
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Q2. Whole data structure concepts
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Q1. What do you want to change in this country if you get a chance
Ans. 
I would focus on improving access to quality education for all citizens.
• Implementing policies to ensure equal opportunities for education

• Investing in infrastructure and resources for schools in underserved areas

• Providing scholarships and financial aid for students from low-income families

• Promoting vocational training programs to address skills gaps in the workforce
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Q2. I don't remember
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Q1. How to list files
Ans. 
To list files, use command line tools like ls or dir.
• Use 'ls' command in Unix/Linux systems to list files in a directory

• Use 'dir' command in Windows systems to list files in a directory

• Add options like -l for detailed listing or -a to show hidden files

• Use wildcards like * to filter files based on patterns
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Q2. Diff between grep and egrep
Ans. 
grep is a basic pattern matching tool, while egrep is an extended version with more advanced pattern matching capabilities.
• grep is a basic command-line utility for searching plain-text data sets for lines that match a regular expression pattern.

• egrep is an extended version of grep that supports more advanced regular expression patterns.

• egrep is equivalent to grep -E, which enables extended regular expressions.

• egrep is ...read more
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Q1. Right now didn't any interview.kindly arrange a interview.
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Q2. No I didn't not received any interview process.
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Q1. What is internal working of hashmap
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where the pair will be stored.

• If multiple key-value pairs hash to the same index, they are stored in a linked list at that index.

• To retrieve a value...read more
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Q2. What is difference between hashmap and concurrent hashmap
Ans. 
HashMap is not thread-safe while ConcurrentHashMap is thread-safe.
• HashMap is not thread-safe and can lead to ConcurrentModificationException if modified while iterating.

• ConcurrentHashMap allows concurrent modifications without the need for external synchronization.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments, allowing multiple threads to operate on different segments concurrently.

• Concurren...read more
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Q3. Can we override main method in java
Ans. 
No, main method in Java cannot be overridden.
• Main method is a static method of a class and cannot be overridden.

• Subclasses can have their own main method, but it will not be considered as the entry point of the program.

• Example: public class SubClass extends MainClass { public static void main(String[] args) { // This is not the entry point of the program }}
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Q4. Write the command to find the hidden files in unix
Ans. 
Use the 'ls' command with the '-a' flag to find hidden files in Unix.
• Use the command 'ls -a' to list all files, including hidden files.

• Hidden files in Unix start with a dot (.) before the file name.

• Example: 'ls -a' will display all files, including hidden files.
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Q5. Write a command to replace a string in unix
Ans. 
Use the sed command to replace a string in Unix
• Use the following syntax: sed 's/original_string/new_string/g' filename

• The 's' flag stands for substitute, 'g' flag stands for global (replace all occurrences)

• Example: sed 's/hello/goodbye/g' file.txt
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Logical and reasoning topics

Q1. Question to check your communication skills, some technical questions related to respective degree
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Q1. Depends on your skill
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Q2. All technical questions related linux,Unix,SQL, oracle
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Q1. Linux,Unix,SQL, oracle, Jenkin, DEVOPS,AWS,hpsm,ITIL, service now
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Q2. Depends on your skills
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Q1. What is docker?
Ans. 
Docker is a platform for developing, shipping, and running applications in containers.
• Docker allows you to package an application and its dependencies into a standardized unit called a container.

• Containers are lightweight, portable, and isolated environments that can run on any machine with Docker installed.

• Docker simplifies the process of managing and scaling applications by providing a consistent environment across d...read more
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Q2. Docker architecture
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Q1. Generally checks the communication skills
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Q2. About projects, college life,
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