Firewalls

As we saw in our discussion of the Internet and similar networks, which connect to the Internet organization offers traffic in both directions. This is clearly desirable in many organizations, such as confidential information is often displayed freely on the intranet (ie TCP / IP, the Internet model only works within the organization). A bit 'from each other so that the organization's intranet and Internet firewalls have been employed. A firewall is just a bunch of components that together constitute an obstacle for the two networks.