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What is a Firewall?

A firewall is a network security device that monitors incoming and outgoing network traffic and allows or blocks data packets based on security rules. The purpose of the firewall is to act as your own personal bodyguard that checks incoming traffic from external sources in order to block malicious traffic like viruses and hackers.

What Firewalls Do?

Basically, firewalls need to be able to perform the following tasks:

  • Defend resources
  • Validate access
  • Manage and control network traffic
  • Record and report on events
  • Act as an intermediary.

A firewall is important when
  • You surf the internet.
  • You connect to the internet via a public network.
  • You run a network which needs to be kept isolated from the internet
  • Most Firewalls are highly configurable so you can easily create security policies to suit your individual needs.