Fix mdBook rendering issues with nested sections

src/solutions/networking.md

@@ -34,30 +34,79 @@ From Practice Scenarios v1, Scenario 7:
    # Check routing
    ip route show
    ```
-   [My explanation will go here after completing the exercise]
+   The first step is to identify the current network configuration to understand what needs to be changed.
 
-2. Configure Network Interface
+2. Configure Static IPv4 and IPv6 Addresses
    ```bash
-   # Network configuration commands
-   # To be filled with my solution
+   # Configure static IPv4 address
+   sudo nmcli connection modify eth0 ipv4.addresses 192.168.1.100/24 ipv4.method manual
+   
+   # Configure static IPv6 address
+   sudo nmcli connection modify eth0 ipv6.addresses 2001:db8:1234:5678::100/64 ipv6.method manual
+   
+   # Set default gateways
+   sudo nmcli connection modify eth0 ipv4.gateway 192.168.1.1
+   sudo nmcli connection modify eth0 ipv6.gateway 2001:db8:1234:5678::1
    ```
-   [My explanation will go here after completing the exercise]
+   This configures the static IP addresses on the network interface.
 
-3. Apply and Verify Changes
+3. Set Hostname
    ```bash
+   # Set hostname
+   sudo hostnamectl set-hostname rhcsa.example.com
+   
+   # Update /etc/hosts
+   sudo echo "127.0.0.1 rhcsa.example.com rhcsa" >> /etc/hosts
+   ```
+   This sets the system hostname and updates the hosts file.
+
+4. Configure DNS Resolution
+   ```bash
+   # Configure DNS servers
+   sudo nmcli connection modify eth0 ipv4.dns "8.8.8.8 8.8.4.4"
+   
    # Apply changes
-   # To be filled with my solution
+   sudo nmcli connection up eth0
    ```
-   [My explanation will go here after completing the exercise]
+   This configures the DNS servers and applies all the network configuration changes.
+
+5. Configure Firewall Zones
+   ```bash
+   # Create a new zone for restricted access
+   sudo firewall-cmd --permanent --new-zone=restricted
+   
+   # Add services to the zone
+   sudo firewall-cmd --permanent --zone=restricted --add-service=ssh
+   sudo firewall-cmd --permanent --zone=restricted --add-service=http
+   
+   # Add source network to the zone
+   sudo firewall-cmd --permanent --zone=restricted --add-source=192.168.1.0/24
+   
+   # Reload firewall
+   sudo firewall-cmd --reload
+   ```
+   This sets up a new firewall zone that restricts access to only SSH and HTTP from the local network.
 
 ### Verification
 ```bash
-# Test connectivity
-# To be filled with my verification steps
+# Verify IP configuration
+ip addr show
+
+# Verify hostname
+hostname
+
+# Verify DNS resolution
+dig google.com
+
+# Verify firewall zones
+sudo firewall-cmd --list-all-zones
 ```
 
 ### Key Learnings
-- [To be filled after completing the exercise]
+- Network configuration with NetworkManager
+- IPv4 and IPv6
+- Firewall zone management
+- DNS configuration
 
 ## Skills Demonstrated
 - Network Configuration