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The first line of perimeter defense; A single "choke point" where security and audit can be imposed. Firewalls must be part of a consistent overall organisational security architecture.
Whether SOHO or large corporation, if you have an Internet connection you need to enforce an access control policy.

These monitor traffic activity. Placed at a strategic point within the overall network, all traffic to and from all devices on the network, is monitored by the IDS. Not all bad traffic originates from outside.