Netcracker Technology Interview Questions, Process, and Tips for Freshers

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
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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
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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
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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. How pods communicates with each others.
Ans. 
Pods communicate with each other through network communication within the same Kubernetes cluster.
• Pods can communicate using localhost or loopback address.

• Pods can communicate using services which act as stable endpoints for pods.

• Pods can communicate using environment variables to pass information.

• Pods can communicate using shared volumes to exchange data.

• Pods can communicate using Kubernetes networking model like DNS
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Q2. What is kube-proxy?
Ans. 
Kube-proxy is a network proxy that runs on each node in a Kubernetes cluster.
• Responsible for routing traffic to the appropriate pods based on IP and port

• Implements load balancing for services within the cluster

• Supports different proxy modes like userspace, iptables, and IPVS
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Q1. Scope resolution with syntax ?
Ans. 
Scope resolution refers to the process of specifying which scope a particular variable or function belongs to in a programming language.
• Scope resolution is typically denoted by the double colon (::) operator in languages like C++ and PHP.

• It is used to access static members, constants, and overridden methods in a class.

• Example: ClassName::staticMember

• Example: Namespace::functionName
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Q2. Template syntax?
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Q3. Copy constructor and assignment operator?
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Q4. V table and V pointer difference?
Ans. 
V table is a table of function pointers used in object-oriented programming, while V pointer is a pointer to the V table.
• V table is a table of function pointers used for dynamic dispatch in object-oriented programming.

• V pointer is a pointer to the V table, allowing objects to call the correct functions at runtime.

• Example: In C++ virtual functions are implemented using V tables and V pointers.
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Q5. Oops concepts in C Language?
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Oops concepts in C Language include encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: struct in C.

• Inheritance: Allowing a class to inherit properties and behavior from another class. Example: using struct to mimic inheritance.

• Polymorphism: Ability to present the same interface for different data types. Example: functi...read more
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Q6. File handling classes?
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File handling classes are used in programming to read, write, and manipulate files.
• File handling classes provide methods to open, read, write, and close files.

• Examples include FileInputStream, FileOutputStream, FileReader, FileWriter in Java.

• These classes help in managing file operations efficiently and securely.
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Q7. Explain friend function with syntax?
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Friend function is a function that is not a member of a class but has access to its private and protected members.
• Friend functions are declared inside a class with the 'friend' keyword.

• They can access private and protected members of the class.

• They are not member functions of the class.

• Example: class MyClass { private: int x; friend void myFriendFunction(MyClass obj); };
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