Today, computer security comprises mainly "preventive" measures, like firewalls or an exit procedure. A firewall can be defined as a way of filtering network data between a host or a network and another network, such as the Internet, and can be implemented as software running on the machine, hooking into the network stack (or, in the case of most UNIX-based operating systems such as Linux, built into the operating system kernel) to provide real time filtering and blocking. Another implementation is a so-called physical firewall which consists of a separate machine filtering network traffic. Firewalls are common amongst machines that are permanently connected to the Internet.
হোস্ট বা নেটওয়ার্ক এবং অন্য নেটওয়ার্কের মধ্যে নেটওয়ার্ক ডেটা ফিল্টারিং করার উপায় হিসাবে কী সংজ্ঞায়িত করা হয়?
A firewall