How to check if a network firewall zone is active in Linux

# Introduction

In this lab, you will learn how to check if a network firewall zone is active in Linux using `firewalld`. We will begin by using the `firewall-cmd --get-active-zones` command to identify the currently active zones and the network interfaces they are associated with.

Following that, we will explore the `firewalld` configuration files located in the `/etc/firewalld` directory to understand where zone rules are defined. Finally, we will inspect the underlying `iptables` rules to see how `firewalld` translates its zone configurations into actual packet filtering rules. This lab provides a foundational understanding of how `firewalld` manages network security on your Linux system.