Palo Alto Networks Senior Staff Engineer Interview Questions and Answers

Was asked to understand a project in python and translate it to NodeJS. This had to be done during the interview with you explaining you thought process through every step.

Coding string related programming

Hacker rank data structure linked list

Q1. System design high level
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Hacker rank data structure trees

Hacker rank codinv problems level medium

Q1. Coding round again D and S
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Q1. System design tech dummies
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Q1. Common questions , why we should hire you , achievements
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Q1. Reverse linked list using the recursion
Ans. 
Reverse a linked list using recursion
• Create a recursive function that takes the head of the linked list as input

• Base case: if the head is null or the next node is null, return the head

• Recursively call the function with the next node as input

• Set the next node's next pointer to the current node

• Set the current node's next pointer to null

• Return the new head of the reversed linked list
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Q2. Find max number in the linked list using stack.
Ans. 
To find max number in linked list using stack.
• Create an empty stack.

• Traverse the linked list and push each element onto the stack.

• Pop elements from the stack and compare with max value.

• Return the max value.
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Aptitude relates questions... It was modratley difficult

Q1. Twchnical rouns. Qas easy... Asked questions oc C and some. Projects
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Q2. Reverse linked list using recursion
Ans. 
Reverse a linked list using recursion
• Create a recursive function that takes the head of the linked list as input

• Base case: if the head is null or the next node is null, return the head

• Recursively call the function with the next node as input

• Set the next node's next pointer to the current node

• Set the current node's next pointer to null

• Return the new head of the reversed linked list
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Q3. What is difference between mutex semaphore?
Ans. 
Mutex is a locking mechanism to ensure exclusive access to a shared resource, while semaphore is a signaling mechanism to control access to a shared resource.
• Mutex allows only one thread to access the shared resource at a time, while semaphore can allow multiple threads to access the shared resource simultaneously.

• Mutex is binary, meaning it has only two states - locked and unlocked, while semaphore can have multiple s...read more
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Checked general aptitude

Multiple coding rounds each tougher than the last

Q1. Mostly related to Python and Kubernetes
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Q1. Mostly related to salaries
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Q1. Explain 3G call flow
Ans. 
3G call flow involves multiple steps including network registration, call setup, and data transfer.
• User equipment (UE) registers with the network by sending a Location Update Request.

• Network authenticates the UE and assigns it a temporary identity.

• UE initiates a call by sending a Setup Request to the network, which then establishes a connection with the called party.

• Data transfer occurs between the two parties over the...read more
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Q2. Explain 23 to 3G handover
Ans. 
23 to 3G handover is a process where a mobile device switches from a 2G network to a 3G network for better data speeds and coverage.
• Handover process involves the mobile device connecting to a new network while maintaining the ongoing call or data session.

• The switch from 2G to 3G network is triggered based on factors like signal strength, network congestion, and data speed requirements.

• During handover, the mobile device...read more
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Q1. Networking related questions
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Q1. Location & compensation related
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One hour Leet code medium question

Q1. Golang related questions and Question on projects done.
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