Zyxel Zywall 1100 VPN Firewall The Zyxel Zywall 1100 VPN Firewall is an ideal choice for businesses looking for a secure and reliable network solution. This firewall offers advanced security features such as a built-in VPN, intrusion prevention system, and content filtering. It also provides a comprehensive set of features to help businesses manage their networks, including bandwidth control, traffic shaping, and user authentication.