Latest Questions 214 total
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151What is the difference between ArrayList and LinkedList in Java?
Both implement the `List` interface but with different internal structures:
**ArrayList:**
- Backed by a dynamic array
- O(1) random access...
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152What is Spring Boot and why is it used for backend development?
Spring Boot is a framework that makes it easy to create production-ready Java applications with minimal configuration.
**Why Spring Boot ov...
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153What is the difference between JDK, JRE, and JVM?
This is one of the most common Java interview questions.
**JVM (Java Virtual Machine):**
- Executes Java bytecode
- Platform-specific (Wind...
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154What is the OWASP Top 10 and why does every developer need to know it?
OWASP Top 10 is the list of the 10 most critical web application security risks, updated every few years.
**2021 OWASP Top 10:**
1. Broken ...
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155What is a firewall and how does it work?
A firewall is a network security system that monitors and controls incoming/outgoing traffic based on predefined rules.
**Types of firewall...
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156What certifications should I get to become an ethical hacker?
Here's the recommended certification path for ethical hacking:
**Beginner (Start here):**
- **CompTIA Security+** — foundational security...
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157What is SQL injection and how do you prevent it?
SQL injection is an attack where malicious SQL code is inserted into an input field to manipulate the database.
**Example attack:**
```
Use...
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158What is the difference between ethical hacking and penetration testing?
These terms are often used interchangeably but have subtle differences:
**Ethical Hacking:**
- Broad term for any authorised hacking activi...
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159What is Azure DevOps and how is it used?
Azure DevOps is Microsoft's all-in-one DevOps platform covering the full software development lifecycle.
**5 main services:**
1. **Azure Bo...
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160What is Azure Active Directory (Azure AD / Entra ID)?
Azure Active Directory (now called Microsoft Entra ID) is Microsoft's cloud-based identity and access management service.
**Key features:**...
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161What is the difference between Azure VM and Azure App Service?
**Azure Virtual Machine (VM):**
- Full control over OS, software, configuration
- You manage OS updates, security patches
- Best for: legacy...
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162How to pass the AWS Solutions Architect Associate exam?
The AWS SAA-C03 exam has 65 questions in 130 minutes. Here's the proven study plan:
**6-Week Plan:**
Week 1-2: Core services
- EC2 (instan...
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163What is the difference between AWS RDS and DynamoDB?
**RDS (Relational Database Service):**
- Managed SQL databases: MySQL, PostgreSQL, Oracle, SQL Server
- Structured data with fixed schema
- ...
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164What is AWS IAM and why is it important?
IAM (Identity and Access Management) controls **who can do what** in your AWS account.
Key concepts:
- **Users** — individual people with...
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165How does AWS Auto Scaling work?
AWS Auto Scaling automatically adjusts the number of EC2 instances based on demand.
**How it works:**
1. You define a **Launch Template** (...
