![]() They usually acted as a gateway that sat between the local area network (LAN) and the Internet and examined and filtered packets coming in and out, making decisions on what to approve and what to reject based on attributes such as destination address or port number. When firewall technology first arrived decades ago, network firewalls were pretty basic. There are many products on the market described as firewalls, ranging in price from a few hundred dollars to tens of thousands of dollars, based on the size and needs of the business and how the firewall will be maintained and supported. Today, every business that connects to the Internet needs a network firewall, not only to protect the network from attacks and malicious behavior, but also to enable business productivity as part of an integrated security architecture that keeps network connections reliable and secure.
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