diff --git a/src/rhcsa.md b/src/rhcsa.md
index 579ef22..5687c80 100644
--- a/src/rhcsa.md
+++ b/src/rhcsa.md
@@ -735,5 +735,16 @@ sudo umount /mnt/iso # Unmount the ISO image
 
 ### dnf config-manager
 sudo dnf config-manager --add-repo="file:///path/to/repo/AppStream" # Add a repository
+sudo dnf config-manager --add-repo="file:///path/to/repo/BaseOS" # Add a repository
+
+sudo dnf repolist # List all repositories
 ```
 
+## Understand and Configure Firewalls
+
+### firewall-cmd
+```bash
+sudo firewall-cmd --get-active-zones # Display the active zones
+sudo firewall-cmd --get-default-zone # Display the default zone
+sudo firewall-cmd --get-zones # Display the zones
+```
\ No newline at end of file