Every company, large and small, needs to protect the information that resides on its networks, and firewalls represent the first line of defence. A firewall is a hardware or software product used to control network traffic between different parts of a network - most crucially, between a company's internal network and the Internet. A firewall inspects and approves or rejects each connection attempt made between the internal and external networks, keeping out unauthorized users, hiding the identity of internal users as they connect to the Internet, and in general providing border security for the company. This title shows the reader how to achieve 24x7 (continuous) security efficiently on their network, providing practical information that can be utilized immediately.