A firewall is an essential part of any secure
computing environment.The Internet is full of script-kiddies and
other baddies and a firewall should be one the first steps you
take in hardening a network host. A well configured firewall
will stop most attacks at the front door by allowing or denying
a packet entry into your system based on its ruleset. Think of
your firewall as a doorman at a prestigious hotel. The people
entering the hotel packets and each room in the hotel is a port
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