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46+ Palo Alto Networks questions

Palo Alto Networks interview questions and how to prepare

The questions candidates report from Palo Alto Networks interviews, sorted by how often they come up, with difficulty and topics, plus original practice written in Palo Alto Networks's interview style.

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ZorixOS tracks 46 community-reported Palo Alto Networks interview questions, drawn from an open-source dataset of real interview reports and sorted by how frequently each one comes up. Every question links to its source. Alongside them are 77 original ZorixOS practice questions written in Palo Alto Networks's known interview style (not claimed as asked at Palo Alto Networks), so you can rehearse the real format. Practice any of them out loud in a free AI mock interview tuned to Palo Alto Networks.

Updated July 2026

Palo Alto Networks interview questions candidates report

Community-reported from real Palo Alto Networks interviews (open-source dataset), most-asked first. Showing 46. Each links to its source.

  1. Add Two Numbers
    Linked ListMathRecursion
    Medium100% asked
  2. Design Twitter
    Hash TableLinked ListDesignHeap (Priority Queue)
    Medium100% asked
  3. Logger Rate Limiter
    Hash TableDesignData Stream
    Easy100% asked
  4. LRU Cache
    Hash TableLinked ListDesignDoubly-Linked List
    Medium100% asked
  5. Merge Intervals
    ArraySorting
    Medium100% asked
  6. Find the Longest Equal Subarray
    ArrayHash TableBinary SearchSliding Window
    Medium93% asked
  7. String Compression
    Two PointersString
    Medium77% asked
  8. Decode String
    StringStackRecursion
    Medium76% asked
  9. Design HashMap
    ArrayHash TableLinked ListDesign
    Easy76% asked
  10. Diameter of Binary Tree
    TreeDepth-First SearchBinary Tree
    Easy76% asked
  11. Group Anagrams
    ArrayHash TableStringSorting
    Medium76% asked
  12. Maximum Profit in Job Scheduling
    ArrayBinary SearchDynamic ProgrammingSorting
    Hard76% asked
  13. Merge Sorted Array
    ArrayTwo PointersSorting
    Easy76% asked
  14. Search in Rotated Sorted Array
    ArrayBinary Search
    Medium76% asked
  15. Longest Substring Without Repeating Characters
    Hash TableStringSliding Window
    Medium73% asked
  16. Minimum Number of Food Buckets to Feed the Hamsters
    StringDynamic ProgrammingGreedy
    Medium71% asked
  17. Binary Tree Level Order Traversal
    TreeBreadth-First SearchBinary Tree
    Medium68% asked
  18. Min Stack
    StackDesign
    Medium68% asked
  19. Insert Delete GetRandom O(1)
    ArrayHash TableMathDesign
    Medium65% asked
  20. Median of Two Sorted Arrays
    ArrayBinary SearchDivide and Conquer
    Hard65% asked
  21. Restore IP Addresses
    StringBacktracking
    Medium65% asked
  22. Top K Frequent Words
    ArrayHash TableStringTrie
    Medium65% asked
  23. Integer to Roman
    Hash TableMathString
    Medium61% asked
  24. Linked List Cycle
    Hash TableLinked ListTwo Pointers
    Easy61% asked
  25. Longest Common Prefix
    ArrayStringTrie
    Easy61% asked
  26. Subarray Sum Equals K
    ArrayHash TablePrefix Sum
    Medium61% asked
  27. Advantage Shuffle
    ArrayTwo PointersGreedySorting
    Medium56% asked
  28. Basic Calculator
    MathStringStackRecursion
    Hard56% asked
  29. Basic Calculator II
    MathStringStack
    Medium56% asked
  30. Invert Binary Tree
    TreeDepth-First SearchBreadth-First SearchBinary Tree
    Easy56% asked
  31. Meeting Rooms
    ArraySorting
    Easy56% asked
  32. Merge Two Sorted Lists
    Linked ListRecursion
    Easy56% asked
  33. Multiply Strings
    MathStringSimulation
    Medium56% asked
  34. Path Sum
    TreeDepth-First SearchBreadth-First SearchBinary Tree
    Easy56% asked
  35. Path Sum II
    BacktrackingTreeDepth-First SearchBinary Tree
    Medium56% asked
  36. Reconstruct Itinerary
    ArrayStringDepth-First SearchGraph Theory
    Hard56% asked
  37. Reverse Linked List II
    Linked List
    Medium56% asked
  38. Sliding Window Maximum
    ArrayQueueSliding WindowHeap (Priority Queue)
    Hard56% asked
  39. Two Sum
    ArrayHash Table
    Easy56% asked
  40. Valid Parentheses
    StringStack
    Easy56% asked
  41. Word Break
    ArrayHash TableStringDynamic Programming
    Medium56% asked
  42. Binary Tree Zigzag Level Order Traversal
    TreeBreadth-First SearchBinary Tree
    Medium52% asked
  43. Koko Eating Bananas
    ArrayBinary Search
    Medium52% asked
  44. Longest Palindromic Substring
    Two PointersStringDynamic Programming
    Medium52% asked
  45. Maximum Length of a Concatenated String with Unique Characters
    ArrayStringBacktrackingBit Manipulation
    Medium52% asked
  46. Remove Zero Sum Consecutive Nodes from Linked List
    Hash TableLinked List
    Medium52% asked

Practice questions in Palo Alto Networks's style

Original ZorixOS questions written the way Palo Alto Networks interviews, so you rehearse the real format. Not claimed as asked at Palo Alto Networks.

  1. Imagine a massive surge in network traffic hitting our Strata NGFW product due to a major global event. How would you diagnose and mitigate potential performance bottlenecks in the data plane, considering the need to maintain security policy enforcement?

    Software EngineerSystem Design and DebuggingTests: Evaluates ability to troubleshoot complex system performance issues under high load and understand network security product architecture.

  2. You're tasked with optimizing the processing pipeline for telemetry data in Cortex XDR. Describe an approach to handle out-of-order events and ensure data integrity while maintaining low latency for threat detection.

    Software EngineerSystem Design and Data PipelinesTests: Assesses understanding of distributed systems, data stream processing, and fault tolerance in security analytics.

  3. We are developing a new feature for Prisma Cloud that integrates with Kubernetes ingress controllers. Design an API endpoint for this feature. What are the key considerations for security, scalability, and extensibility?

    Software EngineerAPI Design and System DesignTests: Tests design skills for secure and scalable APIs in a cloud-native environment.

  4. Consider a scenario where a customer reports intermittent connectivity issues after deploying a new set of security rules on their Prisma Access instance. Walk through your debugging process, focusing on how you'd isolate the problem within the firewall, VPN, or policy engine.

    Software EngineerDebugging and TroubleshootingTests: Evaluates systematic problem-solving skills and knowledge of network security device components.

  5. Write a Python function to identify the top N most frequent IP addresses communicating with a known malicious domain from a large log file of network connections. Assume the log format is `timestamp, src_ip, dst_ip, dst_port, protocol`.

    Software EngineerCoding and Data StructuresTests: Tests basic coding proficiency, data structure selection, and efficiency for log analysis.

  6. How would you design a distributed system to detect and alert on zero-day threats in real-time across millions of endpoints managed by Cortex XDR?

    Software EngineerSystem Design and ScalabilityTests: Measures ability to design large-scale, real-time threat detection systems.

71+ more Palo Alto Networks-style questions are in the free library, each practiceable live with adaptive follow-ups and an honest scorecard. Start free.

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Palo Alto Networks Interview Questions (2026) | ZorixOS