Arista Networks Software Developer Intern Interview Questions and Answers

Q1. Bfs tree traversal
Ans. 
BFS tree traversal visits nodes level by level starting from the root.
• Start at the root node and visit its children before moving on to the next level.

• Use a queue data structure to keep track of nodes to visit next.

• BFS is often used to find the shortest path in unweighted graphs.
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Q2. Resume and core
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Round duration - 60 minutes
Round difficulty - Medium

There were 25 mcqs and 1 coding question. OS, aptitude, C and C++ concepts were the main focus. 

Q1. Which feature of the operating system is being used here?
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Q2. 
Count of Sum of Consecutives Problem Statement
You are given a positive integer 'N'. Your objective is to determine the number of ways to express 'N' as the sum of two or more consecutive natural numbers.
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Ans. Brute Force Approach
Approach:
 
In this brute force approach,. We will iterate from 1 to ‘N’ using the iterator i and will check if there is a possible sequence of consecutive positive integers such that their sum is ‘N’, and the ending integer of the consecutive sequence is 'i'. The checking will be done as follows:
• We know that the ending position is ‘i’. Therefore, we need to find a starting point for the consecut...read more
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Round duration - 60 minutes
Round difficulty - Medium

It was of 60 minutes,

Questions asked were
1. Swap without temp variable
2. A problem question in which I was asked to find the ball with odd weight out of the remaining in the least number of attempts and write an algorithm for it.
3. Code to insert in the middle of circular linked list, code to find middle element of a singly linked list with knowing the number of elements in it.
4. Socket programming
5. Operating system concepts
6. Types of joins in DBMS
7. A DBMS query
8. Print in C without a semi colon
9. If I have any questions in the end.

Q1. 
Swap Numbers Without Temporary Variable
Your task is to interchange the values of two numbers given as variables 'X' and 'Y' without using a temporary variable or any additional variable.
Explanation:
Y...read more
Ans. Addition Approach
• Idea is to get the sum of given two-variable ‘X’ and ‘Y’ in an ‘X’ = ‘X’ + ‘Y’.
• Value of swapped ‘Y’ can get by ‘X’ - ‘Y’ = (‘X’ + ‘Y’) - ‘Y’ = ‘X’
• Value of swapped ‘X’ can get by ‘X’ - ‘Y’ = (‘X’ + ‘Y’) - ‘Y’ = (‘X’ + ‘Y’) - ‘X’ = ‘Y’
• The current value of ‘Y’ is the initial value of ‘X’
• Suppose ‘X’ is 10 and ‘Y’ is 20 then
  • ‘X’ = ‘X’ + ‘Y’ = 20+10’
  • Swapped value of ‘Y’ is ‘X’- ‘Y’ = 30-20 = 10’
  • And the swappe...read more
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Q1. What is tuple and list
Ans. 
Tuple and list are data structures in Python. Tuple is immutable and ordered, while list is mutable and ordered.
• Tuple is immutable, meaning its elements cannot be changed after creation

• List is mutable, meaning its elements can be changed after creation

• Tuple is ordered, meaning it maintains the order of elements

• List is ordered, meaning it maintains the order of elements

• Example of tuple: (1, 2, 3)

• Example of list: [1, 2,
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Basic java mcq, Java Hibernate Spring MVC framework questions

Coding test was comprising of mcq based questions on db, oops, c++ and java

Q1. It was a high intense interview. Interview starts with introduction and some resume based questions. Then, followed by deep networking and os based questions. Then, dsa questions were asked specifically on...read more
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Q1. It was also a tough one. Questions were specifically on project based of the resume and other questions were on btech curriculum, subjects, and experience.
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Q1. HR was easy. Questions were only about relocation and package breakup. But remember that they can put you in waiting and when needed they can call for another interview. So mark this and all the best.
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Q1. What is incremental load and how it works?
Ans. 
Incremental load is a process of updating a data warehouse or database by adding only the new or modified data.
• Incremental load is used to minimize the amount of data that needs to be processed and loaded.

• It involves identifying the changes in the source data and applying those changes to the target system.

• Common techniques for incremental load include using timestamps, change data capture, or comparing checksums.

• For e...read more
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Q2. What is the differences between keep and join ?
Ans. 
Keep and join are both used in programming, but they have different meanings and purposes.
• Keep is a method used to filter elements from a collection based on a condition.

• Join is used to combine elements from two or more collections based on a common attribute.

• Keep returns a new collection with only the elements that satisfy the condition.

• Join combines elements from multiple collections into a single collection.

• Keep is ...read more
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Q3. What is synthetic Key and how to remove them ?
Ans. 
A synthetic key is a composite key created when two or more tables have multiple common fields.
• Synthetic keys occur when there is a many-to-many relationship between tables.

• They can be removed by resolving the underlying data model issues.

• One way to remove synthetic keys is by creating a bridge table to represent the many-to-many relationship.

• Another approach is to concatenate the common fields to create a unique key.

• S...read more
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Coding test on hackerrank

Q1. Question on Tree
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Q2. Asked to solve a few puzzles
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