Netcracker Technology Interview Questions, Process, and Tips

Q1. Abput polymorphism? with code
Ans. 
Polymorphism allows objects of different classes to be treated as objects of a common superclass.
• Polymorphism allows for flexibility and reusability in code.

• It enables a single interface to be used for different data types or classes.

• Examples include method overriding in inheritance and method overloading within a class.
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Q2. STL MAPS? with code
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STL MAPS are associative containers that store elements formed by a combination of a key value and a mapped value.
• STL MAPS are implemented as red-black trees for efficient searching, insertion, and deletion.

• Elements in a map are always sorted based on the key value.

• Example: std::map<int, string> myMap; myMap[1] = 'one';
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Q3. Plaindrome & string related code
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Q1. Total c++ concepts hand written paper in code
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Q2. Combination of 4 pillars of oops in one code
Ans. 
Encapsulation, Inheritance, Polymorphism, Abstraction in one code
• Create a class with private variables and public methods to demonstrate encapsulation

• Create a subclass that inherits from a parent class to demonstrate inheritance

• Use method overloading or overriding to demonstrate polymorphism

• Use abstract classes or interfaces to demonstrate abstraction
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Q3. Double linked list code
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Q4. Triangle code all codes in paper should explain line to line
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Q1. Memory leak issues explanation
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Memory leaks occur when a program fails to release memory it no longer needs, leading to inefficient memory usage.
• Memory leaks can occur when a program dynamically allocates memory but forgets to deallocate it.

• Common causes of memory leaks include not freeing memory after use, using incorrect deallocation functions, and circular references.

• Memory leaks can lead to performance issues, crashes, and system instability.

• Too...read more
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Q2. About yourself
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Q3. Salary any offers
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Q1. About yourself ?
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Q2. Salary negotiation
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Q3. Why netcracker ?
Ans. 
Netcracker is a leading provider of BSS, OSS, and SDN/NFV solutions for service providers around the world.
• Netcracker offers comprehensive solutions for business support systems (BSS), operations support systems (OSS), and software-defined networking (SDN) / network functions virtualization (NFV).

• Netcracker has a strong track record of working with major service providers globally, including telecommunications companie...read more
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Q4. Are you immediate joiner ?
Ans. 
Yes, I am available to join immediately.
• I am currently not committed to any other projects.

• I have completed all necessary notice periods at my previous job.

• I am excited to start working with your team as soon as possible.
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Basic OOPS, OS, Output related MCQs

2 medium level codes in a time frame of 1 hour, mostly oops related or array/string

Q1. Project related questions
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Q2. Double array real life example
Ans. 
Double array real life example: storing student names in different classes
• Each index of the main array represents a different class

• Each sub-array contains the names of students in that class

• Example: [['Alice', 'Bob'], ['Charlie', 'David']]
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Q1. Describe yourself
Ans. 
I am a detail-oriented software engineer with a passion for problem-solving and continuous learning.
• Detail-oriented

• Passionate about problem-solving

• Continuous learner
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Q2. Strength & Weakness
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Q1. How you harden your linux server
Ans. 
I harden my Linux server by implementing security measures to protect against potential threats.
• Regularly update the operating system and software to patch vulnerabilities

• Disable unnecessary services and ports to reduce attack surface

• Implement strong password policies and use SSH keys for authentication

• Set up a firewall to control incoming and outgoing traffic

• Monitor logs for suspicious activities and set up intrusion
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Q2. Write script to echo line repeatedly
Ans. 
Script to echo a line repeatedly
• Use a loop to echo the line multiple times

• Specify the number of times to repeat the line

• Example: for i in {1..5}; do echo 'Hello, World!'; done
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Q3. Sed command syntax and what are special permission
Ans. 
sed command is used for text manipulation in Linux. Special permissions include setuid, setgid, and sticky bit.
• sed command is used for text substitution and manipulation in Linux

• Syntax: sed 's/pattern/replacement/g' filename

• Special permissions in Linux include setuid, setgid, and sticky bit

• Setuid: allows a user to execute a file with the permissions of the file owner

• Setgid: allows a user to execute a file with the perm...read more
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Q4. How to get MAC based routing table ? what happened at kernel level when we pung server.
Ans. 
To get MAC based routing table, use 'ip neigh show' command. When pinging a server, kernel sends ICMP packets and updates ARP cache.
• Use 'ip neigh show' command to display MAC based routing table

• Kernel sends ICMP packets when pinging a server

• Kernel updates ARP cache with MAC address of the server
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Q5. Which performance tuning parameter you know and how to set it permanently and temporary
Ans. 
One performance tuning parameter is swappiness, which controls how often the system swaps data to disk.
• To set swappiness temporarily, use the 'sysctl' command: sysctl vm.swappiness=10

• To set swappiness permanently, edit the '/etc/sysctl.conf' file and add 'vm.swappiness=10'

• Another performance tuning parameter is 'dirty_ratio' which controls the percentage of system memory that can be filled with dirty pages before proce...read more
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Q6. How to check wwn number
Ans. 
To check WWN number, use commands like 'lsscsi' or 'lsblk' in Linux.
• Use 'lsscsi' command to list SCSI devices and their WWN numbers

• Use 'lsblk' command to list block devices and their WWN numbers
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Q1. Generally About yourself
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Q2. What is Change request
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Q3. What is release process in SDLC
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Q4. Explain change life cycle
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Q5. What if you are asked to do a change without approval
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Q6. Are you ITIL certified
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Q7. Flow of ITIL service now
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Q8. What were your roles and responsibilities of your previous job
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Q1. Also same questions as above
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Q2. Explaination in details
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