Understanding Firewalls – Types, Configuration, and Best Practices for Effective Network Security

A firewall is a security device that controls the flow of traffic across a network. A firewall may be a hardware appliance, or it may be a piece of software that runs on a third-party operating system. Firewalls operate based on a set of pre-defined, as well as customizable security rules that inspect network traffic to block or permit access to a network. Oftentimes, a firewall is logically positioned between a private and a public network, acting as both the first and last line of defense in a network. In a large enterprise, it is common to see separate firewalls within the network…