Juniper Networks Software Engineer III Interview Questions and Answers

Q1. What is polymorphism
Ans. 
Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

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

• Examples include method overloading and method overriding in object-oriented programming.
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Q2. Find missing number from nth number array.
Ans. 
Find missing number from nth number array.
• Iterate through the array and calculate the sum of all numbers

• Calculate the sum of numbers from 1 to n using the formula n*(n+1)/2

• Subtract the sum of array from the sum of numbers from 1 to n to find the missing number
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Q3. Explain inheritance and it types
Ans. 
Inheritance is a concept in object-oriented programming where a class inherits properties and behaviors from another class.
• Inheritance allows a class to reuse code from another class.

• Types of inheritance include single inheritance, where a class inherits from only one parent class, and multiple inheritance, where a class inherits from multiple parent classes.

• Example: Class B inherits from Class A, so Class B can access
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Q4. Find 2nd max elements from aaray
Ans. 
Find 2nd max element from array of strings
• Sort the array in descending order

• Skip the first element (max element)

• Return the second element
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Q1. Trie based question
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Q2. Design LRU cache
Ans. 
Design a data structure for LRU cache with get and put operations, evicting least recently used item when capacity is reached.
• Implement a doubly linked list to keep track of the order of keys based on their usage

• Use a hashmap to store key-value pairs for quick access

• Update the order of keys in the linked list when a key is accessed or inserted

• Evict the least recently used item when the cache reaches its capacity
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Q1. Unique ID generator
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Q2. Project related questions
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Q1. Operating systems, DBMS
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Q2. Few question on projects from my previous company
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Q1. Java basics , oops , spring
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Q1. Manger round basics behavior
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Q1. Ds implementation in python
Ans. 
Data structure implementation in Python
• Use built-in data structures like lists, dictionaries, sets, etc.

• Implement custom data structures like linked lists, stacks, queues, trees, etc.

• Utilize libraries like NumPy for efficient array operations

• Practice implementing algorithms using data structures
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Q1. Leetcode medium python question
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Basic java mcq, Java Hibernate Spring MVC framework questions

Q1. Work experience over last company
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Q2. Conflict resolution in teams
Ans. 
Conflict resolution in teams involves effective communication, active listening, compromise, and collaboration.
• Encourage open communication to address issues early on

• Practice active listening to understand all perspectives

• Seek compromise and find common ground

• Encourage collaboration to work towards a solution together
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1 hr, oops, C++ questions and C