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50+ Alcatel-Lucent Interview Questions and Answers

Updated 26 Oct 2024
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Q1. How many such letter-pairs are there in the word SERVANT, having the same no. of letters left between them in the word as they have in the series?

Ans.

Counting letter-pairs with same no. of letters left between them in the word SERVANT.

  • Identify the letter-pairs in the word SERVANT.

  • Count the number of letters between each pair.

  • Compare the count with the position of the pair in the word.

  • If they match, increment the count of such pairs.

  • Answer the total count of such pairs.

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Q2. Difference between string object and string literal and string buffer.. given array of strings and need to sort them and then array -(8, 6, 9,5,7,7) target -14 need to find the pair of numbers. Spring and sprin...

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Ans.

Explains difference between string object, string literal and string buffer. Also, sorts array and finds pair of numbers.

  • String object is an instance of a class, string literal is a sequence of characters enclosed in double quotes, and string buffer is a mutable sequence of characters.

  • To sort an array of strings, use Arrays.sort() method.

  • To find a pair of numbers in an array that add up to a target value, use a nested loop to compare each element with every other element.

  • Exam...read more

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Q3. Why world needs programming? Which Lang you prefer? What is oops? Pillars of opps? What is datatype? What is operating system!

Ans.

Programming is essential for automating tasks, solving complex problems, and creating innovative technologies.

  • Programming is needed to automate repetitive tasks and increase efficiency.

  • It is essential for developing software applications, websites, and mobile apps.

  • Programming allows for the creation of innovative technologies like artificial intelligence and virtual reality.

  • Object-oriented programming (OOP) is a programming paradigm based on the concept of objects, which can ...read more

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Q4. Describe difference between data hiding and abstraction.

Ans.

Data hiding is hiding the implementation details while abstraction is hiding the complexity of the system.

  • Data hiding is a technique to hide the implementation details of a class from the outside world.

  • Abstraction is a technique to hide the complexity of the system by providing a simplified interface.

  • Data hiding is achieved through access modifiers like private, protected, and public.

  • Abstraction is achieved through abstract classes and interfaces.

  • Data hiding is used to preven...read more

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Q5. What are ACID properties in DBMS?

Ans.

ACID properties are a set of properties that ensure reliability and consistency of data in a database.

  • ACID stands for Atomicity, Consistency, Isolation, and Durability.

  • Atomicity ensures that a transaction is treated as a single, indivisible unit of work.

  • Consistency ensures that the database remains in a valid state before and after a transaction.

  • Isolation ensures that concurrent transactions do not interfere with each other.

  • Durability ensures that once a transaction is commit...read more

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Q6. Tell about collection api and array list internal implementation and write syntax for hashmap ..

Ans.

Explanation of Collection API, ArrayList internal implementation and syntax for HashMap

  • Collection API is a set of interfaces and classes that provide a framework for handling groups of objects

  • ArrayList is a resizable array implementation of List interface in Collection API

  • ArrayList internally uses an array to store the elements and dynamically increases its size as required

  • Syntax for HashMap: HashMap map = new HashMap();

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Q7. Do you know any ticketing tool?

Ans.

Yes, I am familiar with ticketing tools.

  • I have experience using JIRA for issue tracking and project management.

  • I have also used ServiceNow for IT service management.

  • Other ticketing tools I am familiar with include Zendesk and Freshdesk.

  • I understand the importance of using ticketing tools to efficiently manage and track issues.

  • I am comfortable using ticketing tools to communicate with team members and stakeholders.

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Q8. What is a signal .Draw the graph of sin wave

Ans.

A signal is a physical quantity that varies with time, conveying information. A sine wave is a periodic signal.

  • A signal can be electrical, acoustic, or optical.

  • Signals can be analog or digital.

  • Examples of signals include sound waves, radio waves, and voltage signals.

  • A sine wave is a smooth, repetitive oscillation that can be described mathematically.

  • It is characterized by its amplitude, frequency, and phase.

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Q9. What is Delete in SQL?

Ans.

DELETE is a SQL command used to remove rows from a table.

  • DELETE is used with the WHERE clause to specify which rows to remove

  • It can also be used with JOIN to delete rows from multiple tables

  • The deleted rows can be recovered using the ROLLBACK command

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Q10. How can I learn python? consider I'm a newbie

Ans.

Learning Python as a newbie

  • Start with basic syntax and data types

  • Practice coding exercises and challenges

  • Read documentation and watch tutorials

  • Join online communities and forums for support

  • Work on personal projects to apply knowledge

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Q11. What are OOPs concepts?

Ans.

OOPs concepts are the fundamental principles of Object-Oriented Programming that help in designing and implementing software systems.

  • Encapsulation: bundling of data and methods that operate on that data

  • Inheritance: creating new classes from existing ones

  • Polymorphism: ability of objects to take on multiple forms

  • Abstraction: hiding implementation details and showing only functionality

  • Examples: Java, C++, Python, Ruby

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Q12. How many ways can css be included in HTML?

Ans.

CSS can be included in HTML in three main ways: inline, internal, and external.

  • Inline CSS - using the style attribute within an HTML element

  • Internal CSS - using the <style> tag within the <head> section of the HTML document

  • External CSS - linking an external CSS file to the HTML document using the <link> tag

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Q13. Difference between Place by value and place by reference.

Ans.

Place by value passes a copy of the value, while place by reference passes a reference to the original value.

  • Place by value creates a new copy of the value, while place by reference uses the original value.

  • Place by value is used for simple data types like integers and floats, while place by reference is used for complex data types like arrays and objects.

  • An example of place by value is passing an integer to a function, while an example of place by reference is passing an arra...read more

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Q14. Which Book do you refer for computer networks?

Ans.

Computer Networking: A Top-Down Approach by James Kurose and Keith Ross

  • Provides a comprehensive overview of computer networking concepts and protocols

  • Covers both theoretical foundations and practical applications

  • Includes real-world examples and case studies for better understanding

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Q15. How will you display top 5 rows from a table?

Ans.

Use SQL query with LIMIT clause to display top 5 rows from a table.

  • Use SELECT statement to retrieve data from the table

  • Add LIMIT 5 at the end of the query to display only the top 5 rows

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Q16. Tell me about principles of OOPs

Ans.

OOPs principles are encapsulation, inheritance, and polymorphism.

  • Encapsulation is the process of hiding implementation details from the user.

  • Inheritance allows a class to inherit properties and methods from another class.

  • Polymorphism allows objects to take on multiple forms or behaviors.

  • Abstraction is the process of hiding complex implementation details from the user.

  • Objects are instances of classes that contain data and behavior.

  • Classes are templates for creating objects wit...read more

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Q17. What are the languages that support OOPS concept

Ans.

Languages that support OOPS concept include Java, C++, Python, C#, and Ruby.

  • Java

  • C++

  • Python

  • C#

  • Ruby

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Q18. What are different type of Css styling?

Ans.

Different types of CSS styling include inline, internal, external, and imported stylesheets.

  • Inline CSS is applied directly to an HTML element using the style attribute.

  • Internal CSS is defined within the head section of an HTML document using the style tag.

  • External CSS is stored in a separate file and linked to the HTML document using the link tag.

  • Imported stylesheets allow for modular CSS by importing one stylesheet into another using the @import rule.

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Q19. What is OOPS concept?

Ans.

OOPS stands for Object-Oriented Programming System. It is a programming paradigm based on the concept of objects.

  • OOPS is based on four main concepts: encapsulation, inheritance, polymorphism, and abstraction.

  • Encapsulation is the process of hiding the implementation details of an object from the outside world.

  • Inheritance allows a class to inherit properties and methods from another class.

  • Polymorphism allows objects of different classes to be treated as if they were of the same...read more

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Q20. Python and its real world applications

Ans.

Python is a versatile programming language used in various real-world applications such as web development, data analysis, artificial intelligence, and automation.

  • Web development: Django and Flask are popular Python frameworks for building websites and web applications.

  • Data analysis: Python is widely used in data science for tasks like data cleaning, visualization, and machine learning.

  • Artificial intelligence: Python libraries like TensorFlow and PyTorch are used for developi...read more

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Q21. What is Scrum?

Ans.

Scrum is an agile framework for managing and completing complex projects.

  • Scrum involves a team working together to complete a project in short iterations called sprints.

  • The team has daily stand-up meetings to discuss progress and plan for the day.

  • Scrum emphasizes flexibility and adaptability to changing requirements.

  • The product owner prioritizes the backlog of work and the team works to complete the highest priority items first.

  • Scrum includes roles such as the Scrum Master, P...read more

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Q22. what are hash maps and hash table?

Ans.

Hash maps and hash tables are data structures that store key-value pairs and use a hash function to map keys to values for efficient retrieval.

  • Hash maps and hash tables are used to implement associative arrays, dictionaries, and sets.

  • They use a hash function to compute an index into an array of buckets or slots, where the value is stored.

  • Collision resolution techniques like chaining or open addressing are used to handle situations where multiple keys map to the same index.

  • Exa...read more

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Q23. Write a program of factorial

Ans.

A program to calculate factorial of a number.

  • Take input from user

  • Use a loop to multiply the number with all the numbers less than it

  • Print the result

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Q24. whether a this __ number is a prime number?

Ans.

A prime number is a number greater than 1 that can only be divided by 1 and itself.

  • A prime number has exactly two distinct positive divisors: 1 and itself.

  • Examples of prime numbers include 2, 3, 5, 7, 11, 13, 17, etc.

  • To determine if a number is prime, check if it is divisible by any number other than 1 and itself.

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Q25. What are different network topology?

Ans.

Different network topologies include bus, star, ring, mesh, and hybrid.

  • Bus Topology: All devices are connected to a central cable.

  • Star Topology: All devices are connected to a central hub.

  • Ring Topology: Each device is connected to exactly two other devices, forming a ring.

  • Mesh Topology: Each device is connected to every other device in the network.

  • Hybrid Topology: Combination of two or more different topologies.

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Q26. Difference between Java or C++ and C

Ans.

Java and C++ are object-oriented languages while C is a procedural language.

  • Java and C++ have built-in support for object-oriented programming concepts like inheritance, polymorphism, and encapsulation.

  • C++ allows for low-level memory manipulation and has better performance than Java.

  • C is a procedural language and lacks the object-oriented features of Java and C++.

  • C is commonly used for system programming and embedded systems.

  • Java is platform-independent while C++ and C are pl...read more

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Q27. explain all sortings along with time complexity

Ans.

Explanation of various sorting algorithms and their time complexities

  • Bubble Sort - O(n^2)

  • Selection Sort - O(n^2)

  • Insertion Sort - O(n^2)

  • Merge Sort - O(n log n)

  • Quick Sort - O(n log n)

  • Heap Sort - O(n log n)

  • Radix Sort - O(nk)

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Q28. What is an Array in C?

Ans.

An array in C is a collection of similar data types stored in contiguous memory locations.

  • Arrays are declared using square brackets []

  • Elements in an array can be accessed using their index number

  • Arrays can be initialized during declaration

  • Arrays can be passed as arguments to functions

  • Example: int arr[5] = {1, 2, 3, 4, 5};

  • Example: printf("%d", arr[2]); // Output: 3

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Q29. WHAT IS A Pointer IN C?

Ans.

A pointer in C is a variable that stores the memory address of another variable.

  • Pointers are used to manipulate data directly in memory.

  • They can be used to pass data between functions efficiently.

  • Pointers can be used to dynamically allocate memory.

  • Example: int *ptr; ptr = # *ptr = 10; // num now equals 10

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Q30. About SDLC? Explain it

Ans.

SDLC stands for Software Development Life Cycle, a process used to design, develop, and maintain software.

  • SDLC is a structured approach to software development.

  • It involves several stages such as planning, analysis, design, implementation, testing, and maintenance.

  • Each stage has its own set of activities and deliverables.

  • SDLC ensures that software is developed efficiently, on time, and within budget.

  • Examples of SDLC models include Waterfall, Agile, and DevOps.

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Q31. How aeroplane flies?

Ans.

An airplane flies due to the principles of aerodynamics and the use of engines to generate thrust.

  • Airplanes generate lift through the shape of their wings and the Bernoulli's principle.

  • Thrust is generated by the engines, which propel the airplane forward.

  • The airplane's weight is counteracted by the lift generated by the wings.

  • Control surfaces such as ailerons, elevators, and rudder are used to control the airplane's movement.

  • Pilots use instruments and controls to monitor and ...read more

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Q32. Real life example of Stack ,Queue, Binary Search.

Ans.

Stack, Queue, and Binary Search are common data structures used in computer science.

  • Stack: Last In First Out (LIFO) data structure. Example: Undo/Redo feature in a text editor.

  • Queue: First In First Out (FIFO) data structure. Example: Print queue in a printer.

  • Binary Search: Efficient search algorithm for sorted arrays. Example: Searching for a word in a dictionary.

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Q33. what are the oops concepts?

Ans.

Object-oriented programming concepts that focus on data encapsulation, inheritance, polymorphism, and abstraction.

  • Encapsulation: Bundling data and methods that operate on the data into a single unit (object)

  • Inheritance: Ability of a class to inherit properties and behavior from another class

  • Polymorphism: Ability to present the same interface for different data types

  • Abstraction: Hiding the complex implementation details and showing only the necessary features

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Q34. What is an array

Ans.

An array is a collection of elements of the same data type, stored in contiguous memory locations.

  • Arrays can be one-dimensional or multi-dimensional

  • Elements in an array can be accessed using their index

  • Arrays can be initialized with values at the time of declaration

  • Examples: int[] numbers = {1, 2, 3}; char[] letters = {'a', 'b', 'c'};

  • Arrays in programming languages like C/C++ are pointers to the first element of the array

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Q35. What is abstraction in java?

Ans.

Abstraction in Java is the concept of hiding the implementation details and showing only the necessary features of an object.

  • Abstraction allows you to define the structure of an object without specifying the implementation details.

  • It helps in reducing complexity by hiding unnecessary details and only showing the essential parts.

  • Abstract classes and interfaces are used to achieve abstraction in Java.

  • Example: Abstract class 'Shape' with abstract method 'draw' can be extended by...read more

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Q36. what are pointers in c++

Ans.

Pointers in C++ are variables that store memory addresses of other variables.

  • Pointers are used to access and manipulate memory directly.

  • They are denoted by an asterisk (*) before the variable name.

  • Example: int *ptr; // declares a pointer to an integer variable

  • Example: ptr = # // assigns the address of 'num' to the pointer

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Q37. What is PSVM and SYSO?

Ans.

PSVM stands for Parallel Support Vector Machine and SYSO stands for System Output.

  • PSVM is a machine learning algorithm used for classification tasks.

  • SYSO refers to the output generated by a system or program.

  • PSVM can be implemented using libraries like LIBSVM.

  • SYSO can include text, images, or numerical data.

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Q38. what are html tags?

Ans.

HTML tags are used to define the structure and content of a web page.

  • HTML tags are enclosed in angle brackets, such as <tag>.

  • They are used to format text, insert images, create links, etc.

  • Examples include <p> for paragraphs, <img> for images, <a> for links.

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Q39. What is SDLC?

Ans.

SDLC stands for Software Development Life Cycle. It is a process used to design, develop, and maintain software systems.

  • SDLC is a structured approach to software development.

  • It consists of several phases including requirements gathering, design, coding, testing, deployment, and maintenance.

  • Each phase has specific activities and deliverables.

  • SDLC helps ensure that software is developed efficiently, meets user requirements, and is of high quality.

  • Examples of SDLC models include...read more

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Q40. What is OOPs

Ans.

OOPs stands for Object-Oriented Programming which is a programming paradigm based on the concept of objects.

  • OOPs focuses on creating objects that have properties and methods

  • It allows for encapsulation, inheritance, and polymorphism

  • Examples of OOPs languages include Java, C++, and Python

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Q41. What is Abstraction?

Ans.

Abstraction is the process of hiding complex details and showing only the essential features of an object or system.

  • Abstraction allows us to focus on what an object does instead of how it does it

  • It helps in reducing complexity and improving efficiency

  • Examples include using a car without knowing the internal combustion engine details, or using a smartphone without understanding the hardware components

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Q42. classes and objects in c++

Ans.

Classes and objects in C++ are used to create user-defined data types with their own properties and behaviors.

  • Classes are used to define the blueprint for objects, containing data members and member functions.

  • Objects are instances of classes, created using the 'new' keyword.

  • Encapsulation, inheritance, and polymorphism are key concepts in object-oriented programming with C++.

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Q43. How Quick sort works

Ans.

Quick sort is a divide-and-conquer algorithm that sorts an array by selecting a pivot element and partitioning the array around the pivot.

  • Select a pivot element from the array

  • Partition the array into two sub-arrays: elements less than the pivot and elements greater than the pivot

  • Recursively apply the same process to the sub-arrays

  • Combine the sorted sub-arrays to get the final sorted array

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Q44. How Merge sort works

Ans.

Merge sort is a divide and conquer algorithm that divides the input array into two halves, sorts them separately, and then merges them.

  • Divide the array into two halves

  • Recursively sort each half

  • Merge the sorted halves back together

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Q45. Explain scenario Outline

Ans.

Scenario Outline is a feature in Cucumber that allows for running the same test scenario with different inputs

  • Scenario Outline is used in Cucumber to create a template for a scenario that can be run multiple times with different inputs

  • It uses placeholders (e.g. ) in the scenario steps that are replaced with actual values from a data table

  • Each row in the data table represents a set of inputs that will be used to run the scenario

  • Scenario Outline is useful for testing the same f...read more

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Q46. Writecodefor binary search

Ans.

Binary search is a divide and conquer algorithm that efficiently finds the target value within a sorted array.

  • Start by defining the low and high indices of the array.

  • Calculate the mid index as (low + high) / 2.

  • Compare the target value with the value at the mid index and adjust the low and high indices accordingly.

  • Repeat the process until the target value is found or the low index surpasses the high index.

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Q47. Explain all OOPs concepts

Ans.

OOPs concepts include inheritance, polymorphism, encapsulation, and abstraction.

  • Inheritance: Allows a class to inherit properties and behavior from another class.

  • Polymorphism: Ability for objects of different classes to respond to the same method.

  • Encapsulation: Bundling data and methods that operate on the data into a single unit.

  • Abstraction: Hiding the complex implementation details and showing only the necessary features.

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Q48. Explain djikstra algorithm

Ans.

Dijkstra algorithm is a graph search algorithm that finds the shortest path between nodes in a graph.

  • Dijkstra algorithm starts at a selected node and explores the neighboring nodes to find the shortest path.

  • It uses a priority queue to keep track of the nodes to be explored next based on their distances from the starting node.

  • The algorithm continues until all nodes have been visited and the shortest path to each node has been determined.

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Q49. Explain event loop on Js

Ans.

Event loop in JavaScript is a mechanism that allows for asynchronous operations to be executed in a non-blocking way.

  • Event loop is responsible for handling asynchronous operations in JavaScript.

  • It allows for tasks to be queued and executed in a non-blocking manner.

  • Event loop continuously checks the call stack and the task queue, moving tasks from the queue to the stack when the stack is empty.

  • Example: setTimeout function in JavaScript uses the event loop to execute a function...read more

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Q50. Implement Binary search

Ans.

Binary search is a divide and conquer algorithm that efficiently finds the target value within a sorted array.

  • Start by defining the low and high indices of the array.

  • Calculate the mid index as (low + high) / 2.

  • Compare the target value with the value at the mid index and adjust the low and high indices accordingly.

  • Repeat the process until the target value is found or the low index surpasses the high index.

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5 Interview rounds
Aptitude Test Round - 1
Technical Round
Aptitude Test Round - 2
Personal Interview1 Round - 1
Personal Interview1 Round - 2
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