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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:

  2. Learn real-life use cases of the nohup command.

  3. Understand the correlation between jump boxes and Nohup environments, including screen and tmux.

  4. Implement and manage Nohup environments:

  5. Learn how nohup allows processes to continue running after a user logs out, ensuring that long-running tasks are not interrupted.

  6. Develop skills in managing background processes effectively using nohup, screen, and tmux.

  7. Develop effective troubleshooting methodologies:

  8. Acquire systematic approaches to diagnosing firewall misconfigurations, network connectivity issues, and unauthorized access attempts.
  9. 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):