Juniper Networks interview questions
Online test → Technical → Technical → HR·78% entry level
CS fundamentals
Showing 37 of 109 reported in this area
Explain the OSI model or TCP/IP model in detail.
Explain MAC addressing, IP addressing, ARP tables, and routing tables.
Explain inheritance in Object-Oriented Programming.
Explain the difference between a Router and a Switch.
Why do we use a Switch along with a Router in a network?
Explain TCP flow control.
Explain ARP and DNS protocols.
Explain the boot process of a PC.
Explain DHCP and the DORA process.
What are VLANs and their applications?
Explain routing protocols OSPF and RIP.
Explain the concept of race conditions.
Explain how a compiler works internally.
Implement htons (host to network short).
Explain different types of software testing.
Write boundary value test cases for a table.
Explain process vs thread and multiprogramming.
Explain routing protocols such as OSPF and RIP.
Explain multithreading concepts in C++ and Java.
Explain socket-based client-server architecture.
What happens in the browser when you type a URL?
Explain the structure and fields of an IP header.
Explain how Network Address Translation (NAT) works.
Explain regular languages and context-free grammars.
Name all OSI layers and important protocols in each.
Explain how NAT works using a given network topology.
How do you detect memory leaks during system startup?
Explain synchronization problems in operating systems.
Explain SMTP protocol and how it works across OSI layers.
Why are mutexes and semaphores used in operating systems?
Explain multithreading and common issues associated with it.
Explain the concept of race conditions in Operating Systems.
List the devices used across all layers of the TCP/IP model.
List the devices used across all layers of the TCP/IP or OSI model.
Explain paging and why it is required. How does virtual memory work?
Why is C widely used in embedded systems despite lacking OOP support?
Explain how messages are sent from one device to another in a network.
DSA
Showing 14 of 48 reported in this area
Explain Dijkstra’s and Bellman-Ford graph traversal algorithms.
Write logic to generate the Tribonacci series.
Merge two sorted arrays into a single sorted array.
Implement get and get-next operations.
Perform insertion sort on a linked list.
Explain merge sort with code and diagram.
Swap nibbles in a number: aabbccdd to ddccbbaa.
Generate the next permutation of a given string.
Sort a doubly linked list. Write the code on paper.
Explain different sorting algorithms and compare them.
Find the repeated elements in an array without using STL.
Detect a loop in a linked list and explain with a diagram.
Check for balanced parentheses with slight modification using regex.
Find the next permutation of a given string with slight modification.
Aptitude
Showing 3 of 7 reported in this area
Basic aptitude questions covering quantitative and logical reasoning.
Solve aptitude problems based on ages.
Solve aptitude problems based on mixtures and allegations.
Behavioural
Showing 3 of 4 reported in this area
Answer situational questions related to work scenarios and decision-making.
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Answer situational questions related to workplace scenarios and decision-making.
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You are being bullied by one of your classmates. How will you tackle the situation?
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Puzzles
Showing 2 of 3 reported in this area
Puzzle: Using two 9-faced dice, how can you obtain all numbers from 0 to 31?
Solve logical puzzles discussed during the interview.
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System design
1 questions reported in this area
Design an airline connectivity system.
Showing 60 of 145 questions. Ranked by how often the same question came back across reports.
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What questions does Juniper Networks ask?
Candidate interview reports most often cover CS fundamentals (63%) and DSA (28%).
How many rounds does Juniper Networks interview have?
Candidate interview reports show an average of 4.6 rounds per experience, with a typical sequence of Online test → Technical → Technical → HR. Individual interview paths can vary.
Is the Juniper Networks interview hard?
Among questions with a reported difficulty, the mix is easy 39%, medium 53%, hard 8%.