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If you are investigating IT Security, you understand that a firewall is meant to prevent unauthorized access to an Intranet or private network, and it does this by analyzing all the incoming data packets in order to block what does not meet the security criteria. There are several different types of firewalls, including the following four types:
For firewall solutions, WavesCo recommends the Cisco adaptive security appliances [1]. If you need more than a firewall, you may be interested in a Unified Threat Management System [2] which can provide you with a unified solution that not only provides firewall services, but also adds on additional services such as:
Links:
[1] http://wavesco.com/solutions/itsecurity/firewalls/cisco-asa-5500
[2] http://www.wavesco.com/solutions/itsecurity/utm