updated notes

src/rhcsa.md

@@ -502,6 +502,14 @@ sudo systemctl restart sshd # Restart the sshd service
 ```bash
 sudo dnf install nfs-utils # Install the NFS utilities
 
+### Port Number ###
+> Note: The port number for NFS is 2049.
+
+### Firewall ###
+sudo firewall-cmd --add-service=nfs --permanent # Add the NFS service to the firewall
+sudo firewall-cmd --reload # Reload the firewall
+sudo firewall-cmd --list-services # List the services in the firewall
+
 sudo nano /etc/exports # Edit the exports file
 
 # Add the following line to the exports file: