15.5 Summary
A newly install Ubuntu system is generally considered to be secure due to the absence of any services running on the system ports. Once the system begins to be configured for use, however, it is important to ensure that it is protected from attack through the implementation of a firewall. When configuring firewalls, it is important to have an understanding of the various ports and the corresponding services.
A number of firewall options are available, the most basic being command-line configuration of the iptables firewall interface. More intuitive and advanced options are available via the Uncomplicated Firewall (ufw) and firewalld, both of which will be covered in the chapters that follow.
