Zscaler Softech Interview Questions and Answers for Freshers

Q1. Find sliding window min ( expected to write code in C)
Ans. 
Implement a function to find minimum values in a sliding window of an array.
• Use a deque to store indices of array elements.

• Maintain the deque in increasing order of values.

• Remove indices that are out of the current window.

• The front of the deque always contains the index of the minimum element.
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Q2. Networking questions
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Q3. Operating system questions
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Q4. C pointers questions
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Quizes and mathematical aptitude

Two case studies were presented

Q1. Why this organization?
Ans. 
I am drawn to this organization because of its innovative approach to data analysis and its commitment to making a positive impact in the industry.
• The organization has a strong reputation for using cutting-edge technology and techniques in data analysis.

• I admire the organization's focus on using data to drive decision-making and improve processes.

• I am impressed by the organization's track record of success and growth i...read more
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Q2. Where do you see yourself in 5 years
Ans. 
In 5 years, I see myself as a seasoned data analyst leading projects and mentoring junior analysts.
• Leading data analysis projects

• Mentoring junior analysts

• Continuing to learn and grow in the field

• Possibly pursuing advanced certifications or degrees

• Contributing to the success of the organization
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1hr hard questions DSA

Q1. Leetcode medium question
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Q2. Leetcode easy question
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Q1. Difference. Between concurrent hash map and synchronised hashmap
Ans. 
ConcurrentHashMap allows multiple threads to access and modify the map concurrently, while SynchronizedHashMap ensures thread-safety by allowing only one thread to access the map at a time.
• ConcurrentHashMap is more efficient in scenarios with high concurrency as it allows concurrent read and write operations.

• SynchronizedHashMap is simpler to use and provides thread-safety, but can lead to performance degradation in hig...read more
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Q2. Semaphores in java how to implement
Ans. 
Semaphores in Java are used for controlling access to a shared resource. They can be implemented using the java.util.concurrent package.
• Use the Semaphore class from the java.util.concurrent package

• Create a Semaphore object with an initial number of permits

• Use the acquire() method to acquire a permit before accessing the shared resource

• Use the release() method to release a permit after accessing the shared resource
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Q3. Bitmask in Postgresql how to use
Ans. 
Bitmask in Postgresql is used to store and manipulate multiple boolean values within a single integer column.
• Bitmask is a technique to represent a set of boolean flags using binary digits.

• In Postgresql, the bitwise operators (&, |, ^, ~) can be used to perform operations on bitmasks.

• To set a specific flag in a bitmask, use the bitwise OR operator (|).

• To check if a flag is set in a bitmask, use the bitwise AND operator ...read more
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Q4. Swap character from uppercase to lowercase and lowercase to uppercase Zscalar ->zSCALAR without using 1.util function 2.arithimatic operator 3.map 4.array function
Ans. 
Swap characters from uppercase to lowercase and lowercase to uppercase in a given string.
• Iterate through each character in the string

• Check if the character is uppercase or lowercase

• Swap the case of the character using bitwise XOR operation

• Build the resulting string with the swapped characters
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Q5. How to create singleton ensuring reflection does not mess up the implementation
Ans. 
To create a singleton ensuring reflection does not mess up the implementation, use an enum or a private constructor with a static field.
• Use an enum to create a singleton as enums are inherently singletons and cannot be instantiated multiple times.

• Alternatively, use a private constructor with a static field to create a singleton.

• To prevent reflection from creating multiple instances, throw an exception in the constructo...read more
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