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Palo Alto Networks Software Developer Interview Questions and Answers

Updated 18 Mar 2024

Palo Alto Networks Software Developer Interview Experiences

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Software Developer Interview Questions & Answers

user image Anil Pushpad

posted on 18 Mar 2024

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Company Website and was interviewed in Feb 2024. There were 3 interview rounds.

Round 1 - Aptitude Test 

Basic question asked

Round 2 - One-on-one 

(4 Questions)

  • Q1. Computer networking based question
  • Q2. Dsa question based on graph and dp
  • Q3. Based on operating system
  • Q4. Function of oops
  • Ans. 

    Object-oriented programming paradigm that focuses on objects and classes for code organization and reusability.

    • 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

  • Answered by AI
Round 3 - HR 

(1 Question)

  • Q1. Behavior question asked

Interview Preparation Tips

Interview preparation tips for other job seekers - prepare well practice on dsa question

Interview questions from similar companies

Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(1 Question)

  • Q1. Data structures, Algorithm
Interview experience
1
Bad
Difficulty level
Hard
Process Duration
2-4 weeks
Result
Not Selected

I applied via Company Website and was interviewed in May 2024. There was 1 interview round.

Round 1 - Assignment 

The task was a Codility type

Interview Preparation Tips

Skills: Networking, OS, Linux kernel
College Name: NA

I was interviewed before Jan 2021.

Round 1 - Coding Test 

(1 Question)

Round duration - 70 Minutes
Round difficulty - Medium

This was an Online Coding+MCQ round where we had a total of 50 MCQ questions and 1 coding problem. The coding problem was of easy to medium level but was a bit implementation heavy.

  • Q1. 

    LRU Cache Design Question

    Design a data structure for a Least Recently Used (LRU) cache that supports the following operations:

    1. get(key) - Return the value of the key if it exists in the cache; otherw...

  • Ans. 

    Design a Least Recently Used (LRU) cache data structure that supports get and put operations with capacity constraint.

    • Implement a doubly linked list to maintain the order of recently used keys.

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

    • When capacity is reached, evict the least recently used item before inserting a new item.

    • Update the position of a key in the linked list whenever it is accessed or updated.

    • H...

  • Answered by AI
Round 2 - Face to Face 

(3 Questions)

Round duration - 60 Minutes
Round difficulty - Medium

This round had 1 coding question in which I was first required to explain my approach and then discuss the time and space complexities. After this , some basic questions from OOPS and Java were asked.

  • Q1. 

    Detect and Remove Loop in Linked List

    For a given singly linked list, identify if a loop exists and remove it, adjusting the linked list in place. Return the modified linked list.

    Expected Complexity:

    A...

  • Ans. 

    Detect and remove loop in a singly linked list in place with O(n) time complexity and O(1) space complexity.

    • Use Floyd's Cycle Detection Algorithm to identify the loop in the linked list.

    • Once the loop is detected, use two pointers to find the start of the loop.

    • Adjust the pointers to remove the loop and return the modified linked list.

  • Answered by AI
  • Q2. What is the difference between ArrayList and LinkedList in Java?
  • Ans. 

    ArrayList is implemented using a dynamic array while LinkedList is implemented using a doubly linked list.

    • ArrayList provides fast random access but slow insertion and deletion operations.

    • LinkedList provides fast insertion and deletion operations but slow random access.

    • Example: ArrayList is suitable for scenarios where frequent access and traversal of elements is required, while LinkedList is suitable for scenarios wher...

  • Answered by AI
  • Q3. What is the difference between abstraction and inheritance?
  • Ans. 

    Abstraction focuses on hiding implementation details, while inheritance allows a class to inherit properties and behavior from another class.

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

    • Inheritance is a mechanism where a new class inherits properties and behavior from an existing class.

    • Abstraction is achieved through interfaces and abstract...

  • Answered by AI
Round 3 - Face to Face 

(3 Questions)

Round duration - 60 Minutes
Round difficulty - Medium

This round had questions from OS and OOPS. The interviewer also tested my problem solving skills by asking me some puzzles in the end.

  • Q1. Can you explain piping in Unix/Linux?
  • Ans. 

    Piping in Unix/Linux allows the output of one command to be used as the input for another command.

    • Piping is done using the | symbol

    • Multiple commands can be piped together

    • Piping allows for the creation of complex command chains

    • Example: ls -l | grep txt

  • Answered by AI
  • Q2. What is a static variable in C?
  • Ans. 

    A static variable in C is a variable that retains its value between function calls.

    • Static variables are declared using the 'static' keyword.

    • They are initialized only once and retain their value throughout the program's execution.

    • Static variables have a default value of 0 if not explicitly initialized.

    • They are stored in the data segment of the program's memory.

    • Example: static int count = 0; declares a static variable 'c

  • Answered by AI
  • Q3. How can you measure exactly 4 liters of water using only a 3-liter can and a 5-liter can?

Interview Preparation Tips

Eligibility criteriaAbove 7 CGPACisco interview preparation:Topics to prepare for the interview - Data Structures, Algorithms, System Design, Aptitude, OOPSTime required to prepare for the interview - 4 MonthsInterview preparation tips for other job seekers

Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.

Application resume tips for other job seekers

Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.

Final outcome of the interviewSelected

Skills evaluated in this interview

I was interviewed before Nov 2020.

Round 1 - Coding Test 

(1 Question)

Round duration - 60 minutes
Round difficulty - Medium

The test was in the evening which was not too late. It was conducted on Hackerrank which is a very common platform and was hence familiar. There were 26 questions:
Q1: Coding Question
3 languages were allowed: c, java8, python3
Q2 - Q26: Multiple Choice Questions

  • Q1. 

    Intersection of Linked List Problem

    You are provided with two singly linked lists containing integers, where both lists converge at some node belonging to a third linked list.

    Your task is to determine t...

  • Ans. 

    Find the node where two linked lists merge, return -1 if no merging occurs.

    • Traverse both lists to find the lengths and the last nodes

    • Align the starting points of both lists by moving the longer list's pointer ahead by the difference in lengths

    • Traverse both lists simultaneously until a common node is found, which is the merging point

  • Answered by AI

Interview Preparation Tips

Professional and academic backgroundI applied for the job as SDE - 1 in BangaloreEligibility criteriaDegree & Specialisation : B.Tech (Computer Science) B.Tech (Information Technology) B.Tech (Electronics & Communication) B.Tech (Electrical & Electronics) MCA M.Sc (Computer Science), Year of Graduation : 2021, CGPA : 7.5 and above, No Current BacklogsCisco interview preparation:Topics to prepare for the interview - Data Communication and Networks, Data Structures, SQL, OOPS, C, C++, JavaTime required to prepare for the interview - 2 MonthsInterview preparation tips for other job seekers

Tip 1 : Practice competitive programming as much as possible. It's never too late. Start now. But it is important to practice before appearing for the paper.
Tip 2 : Try to start making projects early on as it plays a major role during the interviews. 
Tip 3 : Be involved in extra curricular activities and events like Hackathons even if you don't win all of them. It gives a lot of exposure and experience.
Tip 4 : Don't lose touch with your core subjects.
Tip 5 : An internship/training from a good organization always helps (though don't lose hope if you don't have it).
Tip 6 : Focus on your communication skills along with your core subjects as it helps in giving a good impression during the interviews.

Application resume tips for other job seekers

Tip 1 : Maintain a good CGPA (above 7.5)
Tip 2 : Mention your projects as they are noticed in the interview
Tip 3 : Having an internship experience especially from a good organization helps
Tip 4 : Focus on extra curricular activities too
Tip 5 : Do not put things you are not sure about

Final outcome of the interviewRejected

Skills evaluated in this interview

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Campus Placement and was interviewed before Oct 2023. There were 2 interview rounds.

Round 1 - Coding Test 

DSA ques were moderate and aptitude ques were also asked

Round 2 - Technical 

(2 Questions)

  • Q1. DSA ques on array was asked
  • Q2. DSA ques on graph
Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
Selected Selected

I applied via LinkedIn and was interviewed before Oct 2023. There were 2 interview rounds.

Round 1 - Coding Test 

Leetcode live coding with team members

Round 2 - Case Study 

How do u design the network as per the cloud customer requirements

Round 1 - Aptitude Test 

The first round consists of aptitude and coding.Aptitude is of easy to moderate level.

Round 2 - One-on-one 

(2 Questions)

  • Q1. Interview questions were based on projects which are mentioned in your resume and from DBMS and computer networks
  • Q2. Operating systems questions were also asked

Interview Preparation Tips

Interview preparation tips for other job seekers - be confident and honest in interview.prepare well for computer networks fundamentals,DBMS fundamentals

I was interviewed in Aug 2021.

Round 1 - Coding Test 

(1 Question)

Round duration - 70 Minutes
Round difficulty - Medium

This was an Online Coding+MCQ round where we had a total of 50 MCQ questions and 1 coding problem. The coding problem was of easy to medium level but was a bit implementation heavy.

  • Q1. 

    Intersection of Linked List Problem

    You are provided with two singly linked lists containing integers, where both lists converge at some node belonging to a third linked list.

    Your task is to determine t...

  • Ans. 

    Find the node where two linked lists merge, return -1 if no merging occurs.

    • Traverse both lists to find their lengths and the difference in lengths

    • Move the pointer of the longer list by the difference in lengths

    • Traverse both lists simultaneously until they meet at the merging point

  • Answered by AI
Round 2 - Video Call 

(4 Questions)

Round duration - 60 Minutes
Round difficulty - Medium

The interviewer asked 1 coding problem related to Sliding Window in this round and then the rest of the questions were preety much revolving around Computer Networks and OOPS.

  • Q1. 

    Longest Substring Without Repeating Characters Problem Statement

    Given a string S of length L, determine the length of the longest substring that contains no repeating characters.

    Example:

    Input:
    "abac...
  • Ans. 

    Find the length of the longest substring without repeating characters in a given string.

    • Use a sliding window approach to keep track of the longest substring without repeating characters.

    • Use a hashmap to store the index of each character as it appears in the string.

    • Update the start index of the window when a repeating character is found.

    • Calculate the maximum length of the window as you iterate through the string.

    • Return

  • Answered by AI
  • Q2. Can you explain what DNS is?
  • Ans. 

    DNS stands for Domain Name System, which translates domain names to IP addresses.

    • DNS is like a phone book for the internet, translating human-readable domain names (like google.com) to IP addresses (like 172.217.3.206).

    • It helps users access websites by typing in easy-to-remember domain names instead of complex IP addresses.

    • DNS servers store records of domain names and their corresponding IP addresses, allowing for effi...

  • Answered by AI
  • Q3. Explain why MAC addresses are necessary even though we have IP addresses.
  • Ans. 

    MAC addresses are necessary for local network communication and are used to uniquely identify devices on a network.

    • MAC addresses are used at the data link layer of the OSI model to identify devices within the same local network.

    • IP addresses are used at the network layer to identify devices across different networks.

    • MAC addresses are hardcoded into network interface cards (NICs) and are used for communication within the...

  • Answered by AI
  • Q4. How does C++ support polymorphism?
  • Ans. 

    C++ supports polymorphism through virtual functions and inheritance.

    • C++ supports polymorphism through virtual functions and inheritance

    • Virtual functions allow a function to be overridden in a derived class

    • Base class pointers can point to derived class objects, enabling polymorphic behavior

    • Example: class Animal { virtual void makeSound() { cout << 'Animal sound'; } }; class Dog : public Animal { void makeSound() {...

  • Answered by AI
Round 3 - Video Call 

(3 Questions)

Round duration - 60 minutes
Round difficulty - Medium

This round had questions revolving around Computer Networks and Operating Systems.

Tip : Concepts related to Computer Networks is quite frequently asked in Cisco interviews . So its better to remain equipped with all the fundamental concepts. I prepared all the core subjects from my notes and for revision I would suggest the guided paths of Coding Ninjas , they are very useful for quick revision and also the questions over there are very frequently asked in interviews.

  • Q1. What is the ARP protocol?
  • Ans. 

    ARP stands for Address Resolution Protocol, used to map IP addresses to MAC addresses in a local network.

    • ARP is used to find the MAC address of a device based on its IP address

    • It operates at the data link layer of the OSI model

    • ARP requests are broadcasted to all devices on the local network

    • Example: When a device wants to communicate with another device on the same network, it uses ARP to find the MAC address of the des

  • Answered by AI
  • Q2. What are the different types of semaphores?
  • Ans. 

    Different types of semaphores include binary semaphores, counting semaphores, and mutex semaphores.

    • Binary semaphores: Can only have two states - 0 or 1. Used for mutual exclusion.

    • Counting semaphores: Can have multiple states. Used for synchronization among multiple processes.

    • Mutex semaphores: Similar to binary semaphores but with additional features like priority inheritance and deletion safety.

  • Answered by AI
  • Q3. What is thrashing in operating systems?
  • Ans. 

    Thrashing in operating systems is a situation where the system is spending more time swapping data between memory and disk than actually executing tasks.

    • Occurs when the system is overwhelmed with too many processes competing for limited resources

    • Results in a decrease in overall system performance

    • Can be alleviated by optimizing memory usage or adding more physical memory

    • Example: A system with insufficient RAM running mu

  • Answered by AI

Interview Preparation Tips

Eligibility criteriaAbove 7 CGPACisco interview preparation:Topics to prepare for the interview - Data Structures, Algorithms, System Design, Aptitude, OOPSTime required to prepare for the interview - 4 MonthsInterview preparation tips for other job seekers

Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.

Application resume tips for other job seekers

Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.

Final outcome of the interviewSelected

Skills evaluated in this interview

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Palo Alto Networks Interview FAQs

How many rounds are there in Palo Alto Networks Software Developer interview?
Palo Alto Networks interview process usually has 3 rounds. The most common rounds in the Palo Alto Networks interview process are Aptitude Test, One-on-one Round and HR.
What are the top questions asked in Palo Alto Networks Software Developer interview?

Some of the top questions asked at the Palo Alto Networks Software Developer interview -

  1. function of o...read more
  2. dsa question based on graph and...read more
  3. computer networking based quest...read more

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