Ultimate Guide to Cognizant Interview Questions for DevOps/Cloud Engineers (3+ Years Experience) - 2025

Preparing for a Cognizant interview as a DevOps or Cloud Engineer with 3+ years of experience requires a deep understanding of tools, processes, and problem-solving strategies. This guide provides extremely detailed explanations and examples for common interview questions, incorporating feedback from technical reviews to ensure completeness and accuracy.

1. Can you tell me about your recent project? What tools have you used? What is the application? How have you built the infrastructure?

Explanation

This question evaluates your hands-on experience with real-world projects. Highlight your role, tools, and infrastructure design.

Example Answer

Project Overview:
I led the development of a microservices-based healthcare analytics platform designed to process patient data in real time. The application aimed to reduce diagnostic delays by 40% using predictive analytics.

Tools Used:

• Version Control: Git (GitHub)
• CI/CD: Jenkins, Argo CD (GitOps)
• Containerization: Docker
• Orchestration: Kubernetes (EKS)
• Infrastructure as Code (IaC): Terraform
• Cloud Provider: AWS (EC2, S3, RDS, Lambda, VPC, IAM, CloudWatch)
• Monitoring: Prometheus, Grafana, ELK Stack

Application Architecture:

• Frontend: React.js served via S3 and CloudFront.
• Backend: Python-based microservices (Flask) for data processing.
• Database: PostgreSQL (RDS) with read replicas for scalability.
• Event-Driven Workflows: AWS Lambda for serverless data transformation.

Infrastructure Build:

1. IaC with Terraform:
   • Provisioned a VPC with public/private subnets, NAT gateways, and security groups.
   • Deployed EKS clusters with managed node groups.
   • Example Terraform snippet for an S3 bucket:

     resource "aws_s3_bucket" "data_lake" {
       bucket = "healthcare-data-lake"
       acl    = "private"
       versioning {
         enabled = true
       }
     }
     

2. Kubernetes Setup:
   • Used Helm to deploy Prometheus for monitoring and Cert-Manager for TLS certificates.
3. CI/CD Pipeline:
   • Jenkins pipelines built Docker images, ran unit tests, and deployed to EKS.
   • Argo CD synchronized Kubernetes manifests from a Git repository (GitOps).

Why This Works:

• Demonstrates end-to-end ownership of infrastructure.
• Highlights AWS services (VPC, IAM) for security and scalability.

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Perl Interview Questions and Answers - March 2023 Updated 2

 Find Lowest Missing Numbers in perl

The given program is a Perl script designed to find the lowest missing numbers from an array of integers. The script begins by initializing an array of integers named "@arr", which contains a set of random integers. The script then creates a hash called "%hash" that maps each integer in "@arr" to the value 1.

Next, the script finds the maximum integer in "@arr" using the "sort" function and saves it to a variable named "$max". It also sets the value of the minimum integer to -1, and initializes an empty array called "@missing" to store the missing numbers.

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Perl Interview Questions and Answers - March 2023 Updated

John","Smith", 9999 9999, "42,  some street, some area", "bangalore",560038

in above strings "9999 9999" should be single string and "42,  some street, some area" should be single string and 560038 should be single string remaining separate variables write perl program in multiple methods

Sure, here are three different methods to accomplish the task:

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Docker Interview Questions Decoded: Interactive vs. Detached Mode, Container Operations, and Real-World Scalable Pipelines (The Guide That Covers 90% of What Hiring Managers Ask)

Docker has transformed modern software development by enabling developers to build, ship, and run applications in isolated, reproducible environments. However, mastering Docker requires understanding its core operational modes—interactive and detached—and advanced container management techniques. In this comprehensive guide, we’ll explore these concepts in depth, address common pitfalls, and walk through a real-world pipeline project with modern best practices. By the end, you’ll be equipped to deploy scalable, secure, and maintainable containerized applications.

Table of Contents

1. Understanding Docker Containers

   • What Are Containers?
   • Why Docker?

2. Interactive vs. Detached Mode

   • Running Containers Interactively
   • Running Containers in Detached Mode
   • Key Differences and Use Cases

3. Essential Container Operations

• Lifecycle Management
• Logging and Debugging
• Executing Commands in Running Containers
• Data Persistence with Volumes

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Top 500 unique perl programming interview questions and answers to master in perl regular expression programs - part1

 

1. How can I remove leading and trailing white spaces from a string in Perl?

perl
1$str = " Hello World! ";
2$str =~ s/^\s+|\s+$//g;
3print $str; # Output: "Hello World!"

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write 1000 uniq perl interview questions and answers to master in perl part 2

 251. Q: In Perl, how can you find the position of a substring within a string?

1A: In Perl, you can find the position of a substring within a string by using the `index` function. Here is an example:
2
3```perl
4use strict;
5use warnings;
6
7my $string = 'Hello, World! World is beautiful.';
8my $substring = 'World';
9
10my $position = index $string, $substring;
11
12if ($position == -1) {
13    print "The substring was not found in the string.\n";
14} else {
15    print "The substring was found at position: $position\n";
16}
17```
18
19In this example, the script finds the position of the substring `'World'` within the string `'Hello, World! World is beautiful.'` and prints the resulting position.

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write 1000 uniq perl interview questions and answers to master in perl - part1

1. Q: In Perl, what does the sigil $_ represent?

   A: In Perl, the sigil $_ represents the default argument to a subroutine. It is a global variable that is set automatically by Perl whenever a subroutine is called.

2. Q: In Perl, what does the backslash \ do in front of a variable name?

   A: In Perl, the backslash \ in front of a variable name is used to force a string interpretation of the variable, rather than a numeric interpretation. This can be useful when working with non-numeric variables, or when you want to avoid potential side effects caused by Perl's built-in operations on numbers

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AWS Interview Questions Answers - Design Resilent Architectures

Question 1. At Examsdigest.com we use machine learning technologies to collect

and analyze data, and we use Amazon Redshift for a data warehouse. Now, we need

your knowledge to help us implement a disaster recovery plan for Examsdigest.com

to automatically back up our cluster to a second AWS region in the event of an AWS

region outage. Which of the following option will you suggest to implement?

(A) Use Amazon Redshift enhanced VPC routing

(B) Configure cross-Region snapshot

(C) Enable automated snapshots

(D) You don't need to back up the cluster to a second AWS region as Amazon

Redshift is highly available

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