Juniper Networks Interview Questions and Answers

Q1. Difference between Process and Threads
Ans. 
Processes are independent instances of a program, while threads are smaller units within a process sharing resources.
• Processes have their own memory space, while threads share the same memory space within a process.

• Processes are heavyweight, while threads are lightweight.

• Processes communicate with each other through inter-process communication mechanisms, while threads can communicate directly.

• Example: A web browser ru...read more
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Q2. Explain DNS protocol
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DNS protocol is used to translate domain names to IP addresses on the internet.
• DNS stands for Domain Name System

• It translates human-readable domain names (like www.google.com) to IP addresses (like 172.217.3.206)

• DNS operates on a client-server model, with DNS servers hosting DNS records for different domains

• DNS queries are sent by clients to DNS servers to resolve domain names to IP addresses
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This round had a bit of both, technical and coding related questions.. Technical questions were from basic embedded related questions, as well as, networking protocol and layer questions.

Last round was purely coding round with multiple coding questions which includes bitwise operators and linked list questions mainly.

Q1. System design around scalable design
Ans. 
Scalable system design involves creating a system that can handle increased load and growth over time.
• Use microservices architecture to break down the system into smaller, independent services

• Implement load balancing to distribute traffic evenly across servers

• Utilize caching mechanisms to reduce the load on the database

• Design for horizontal scalability by adding more servers to handle increased load

• Consider using cloud...read more
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Test proper coding style, logic along with boundary checks

Q1. I had 4 rounds of interview
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Q2. General Accounting Standards
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Q1. They had asked in depth technical questions
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Q1. This was technical plus general round
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Q1. This was a friendly interview stage
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Q1. Check if a binary tree is BST?
Ans. 
Check if a binary tree is a Binary Search Tree (BST) by validating the inorder traversal.
• Perform an inorder traversal of the binary tree and store the elements in a list.

• Check if the list is sorted in ascending order. If yes, then the binary tree is a BST.

• Ensure that there are no duplicate elements in the binary tree.
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Q2. Question: Modified version of flatten linked list (-----.geeksforgeeks.org/flattening-a-linked-list/amp/). The variation is that the nodes in second and third levels also have next nodes.
Ans. 
Flatten a multi-level linked list where nodes have next pointers at all levels.
• Each node has a value, a next pointer, and a child pointer to another linked list.

• The goal is to flatten the list into a single-level linked list.

• Example: Given 1 -> 2 -> 3, where 2 has a child 4 -> 5, the result should be 1 -> 2 -> 4 -> 5 -> 3.

• Use a stack to traverse and flatten the list iteratively or recursively.
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Q3. Convert the linked list 1,2,3,4,5,6,Null into 1,6,2,5,3,4,Null
Ans. 
Reorder a linked list by alternating between the first and last elements
• Create two pointers, one at the beginning and one at the end of the linked list

• Iterate through the linked list, moving the first pointer to the next node and the second pointer to the previous node

• Adjust the pointers to reorder the linked list by alternating between the first and last elements
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Normal dsa Basics and aptitude.

Q1. Give the elements of an array that sum up to given number.
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Q2. Binary search using recursion.
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Q1. Why should we hire you?
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Q2. Why are you interested to join juniper?
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Easy to crack the interview DSA