Zscaler Softech Senior Devops Engineer Interview Questions, Process, and Tips

Three questions regarding dynamic programming and arrays

Q1. Largest Common Subsequence DP problem
Ans. 
Largest Common Subsequence DP problem involves finding the longest subsequence that is common to two given strings.
• Use dynamic programming to solve this problem efficiently.

• Create a 2D array to store the lengths of common subsequences of substrings.

• Traverse the array to find the length of the largest common subsequence.

• Example: Given strings 'ABCD' and 'ACD', the largest common subsequence is 'ACD'.
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Q2. Palindromes in a string
Ans. 
Check if a string contains any palindromes
• Iterate through each string in the array

• Reverse the string and compare it with the original string to check for palindrome

• Return true if any palindrome is found, false otherwise
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Q1. Sql vs No Sql
Ans. 
SQL is a traditional relational database management system, while NoSQL is a non-relational database system.
• SQL is structured, uses tables with rows and columns, and follows ACID properties.

• NoSQL is unstructured, uses collections of documents, key-value pairs, or graphs, and is horizontally scalable.

• SQL is better for complex queries and transactions, while NoSQL is better for large amounts of data and flexible schemas.
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Q1. Basic HR questions
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Coding skills in python

Q1. Whre do yo use python
Ans. 
Python is used in various areas such as web development, data analysis, automation, machine learning, and more.
• Web development (Django, Flask)

• Data analysis (Pandas, NumPy)

• Automation (Scripting, DevOps tools)

• Machine learning (TensorFlow, PyTorch)
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Q2. What are all important Devops tools
Ans. 
Some important DevOps tools include Jenkins, Docker, Ansible, Kubernetes, and Git.
• Jenkins

• Docker

• Ansible

• Kubernetes

• Git
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Q1. Are you willing to work in shifts
Ans. 
Yes, I am willing to work in shifts.
• I am flexible with my working hours and can adapt to different shifts.

• I understand the importance of round-the-clock support in a DevOps role.

• I have previous experience working in shifts and have no issues with it.
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Q2. What are your sal expectation
Ans. 
My salary expectation is based on my experience, skills, and the market rate for DevOps Engineers.
• I have researched the average salary range for DevOps Engineers in this location.

• I am looking for a competitive salary that reflects my expertise in the field.

• I am open to negotiation based on the overall compensation package offered.
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Q1. Past experience in devops
Ans. 
I have 5 years of experience in implementing DevOps practices in various organizations.
• Implemented CI/CD pipelines using tools like Jenkins, GitLab CI, and CircleCI

• Automated infrastructure provisioning with tools like Terraform and Ansible

• Managed containerized applications using Docker and Kubernetes

• Monitored and maintained production systems with tools like Prometheus and Grafana
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Q2. Scripted jeninsfile for CI
Ans. 
A scripted Jenkinsfile is a Groovy script that defines the pipeline for Continuous Integration (CI).
• Use 'pipeline' block to define the stages of the CI pipeline

• Utilize 'stage' block to specify individual stages within the pipeline

• Leverage 'steps' block to define the actions to be executed within each stage

• Use 'node' block to allocate a Jenkins agent for running the pipeline

• Utilize 'checkout' step to fetch the source co
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Q1. WAF implementation in AWS
Ans. 
Implementing a Web Application Firewall (WAF) in AWS for enhanced security.
• Use AWS WAF to protect web applications from common web exploits.

• Create rules to filter and monitor HTTP and HTTPS requests.

• Integrate AWS WAF with other AWS services like CloudFront or API Gateway for comprehensive protection.
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Q2. Write a CD jenkinsfile
Ans. 
A CD Jenkinsfile automates the Continuous Delivery process in Jenkins.
• Define stages for build, test, deploy

• Use declarative syntax for pipeline

• Include steps for version control, artifact management

• Utilize plugins for notifications, approvals

• Implement error handling and rollback mechanisms
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Q1. Day to day activities
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Q2. Questions based on azure in day to day activities
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Which is best City or Village

Q1. Basic Programming language questions & OOPS
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Q1. Basic programming language concept
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Q1. Situation question
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Q1. Linux AWS git jenkins
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It was general aptitude round.

Questions form DSA to check problem solving abilities.

Q1. Second largest number in an array.
Ans. 
Find the second largest number in an array of strings.
• Convert the array of strings to an array of integers for comparison.

• Sort the array in descending order and return the second element.

• Handle cases where there may be duplicates of the largest number.
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