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TICSA TruSecure™ ICSA Certified Security Associate Exam TU0-001 by Shawn Porter, Debra Littlejohn Shinder, Mike Chapple

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Introduction to Firewalls

Firewalls are used to control inbound and outbound access into and out of a private network. Firewalls see networks as trusted or untrusted. A trusted network is typically all the network segments contained on the internal, private network. Packets are allowed to flow relatively freely between segments on the trusted network. An untrusted network includes all hosts that are not part of the internal, private network. These can be Internet hosts, untrusted segments on the private network, or DMZ segments that are under your direct control. DMZ is a military abbreviation for “demilitarized zone” and refers to a specific buffer area between the inside and outside boundaries around an installation; we discuss DMZ segments ...

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