PPT Slide
A Firewall is a system that enforces access control policies between two computer networks. In principle, one network blocks data traffic, while the other network permits data traffic. The policy; simply put, is what you either permit or deny in and out of your network or internet environment.
Port Scanning is a method to quickly analyze and identify open ports on a computer system. Each computer has several ports. If found open (like an unlocked door) entrance can be gained.