As we saw in our discussion of the Internet and similar networks, which link the organization on the Internet provides a flow in both directions of traffic. This is clearly undesirable in many organizations, including the confidential information that is provided in many cases freely within the corporate network, a network TCP / IP, such as the Internet, which only works within the organization.
To ensure a degree of separation between the internal network of the Foundation and the Internet offer, and working as firewalls. A firewall is simply a set of components that together form a barrier between networks.
There are a number of conditions specific to firewalls and networks will be used in this section, so let us all to introduce.
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