Database Protection | firewalls

FIREWALLS

INTRODUCTION-

• The term firewall originally referred to a wall intended to confine a fire or potential fire within a building. Later uses refer to similar structures, such as the metal sheet separating the engine compartment of a vehicle or aircraft from the passenger compartment.
• In computing, a firewall is a software or hardware-based network security system that controls the incoming and outgoing network traffic based on applied rule set. 
• A firewall establishes a barrier between a trusted, secure internal network and another network (e.g., the Internet) that is not assumed to be secure and trusted.
• Many personal computer operating systems include software-based firewalls to protect against threats from the public Internet.
•  Many routers that pass data between networks contain firewall components and, conversely, many firewalls can perform basic routing functions.