Unit 6 - Firewalls

Overview

This unit focuses on Nohup environments and firewalls.

• We will cover Nohup tools and how to properly use Nohup environments.
• We will explore different types of firewalls and learn the use cases for each firewall type.

Learning Objectives

1. Become familiar with the nohup command:

   • Learn real-life use cases of the nohup command.
   • Understand the correlation between jump boxes and Nohup environments, including screen and tmux.

2. Implement and manage Nohup environments:

   • Learn how nohup allows processes to continue running after a user logs out, ensuring that long-running tasks are not interrupted.
   • Develop skills in managing background processes effectively using nohup, screen, and tmux.

3. Develop effective troubleshooting methodologies:

   • Acquire systematic approaches to diagnosing firewall misconfigurations, network connectivity issues, and unauthorized access attempts.
   • Apply structured troubleshooting strategies to minimize downtime and maintain high availability.

Prerequisites

• A basic understanding of how processes work.
• Familiarity with the firewalld service.
• The ability to understand .xml files.

Key Terms and Definitions

Firewall

Zone

Service

DMZ (Demilitarized Zone)

Proxy

Stateful Packet Filtering

Stateless Packet Filtering

WAF (Web Application Firewall)

NGFW (Next-Generation Firewall):