It was not originally
designed to provide robust security between networks, so security concepts needed to be
developed to secure access between entities on the Internet. Special devices known as
firewalls were created to block access to internal network resources for specific companies.
Originally, many organizations were not directly connected to the Internet. Often, even
when a connection was created, there was no type of firewall put into place because the
perception was that only government or high-security organizations required protection.
With the explosion of viruses, hacking attempts, and worms that began to proliferate,
organizations soon began to understand that some type of firewall solution was required
to block access to specific ???dangerous??? TCP or UDP ports that were used by the
Internet??™s TCP/IP protocol. This type of firewall technology would inspect each arriving
packet and accept or reject it based on the TCP or UDP port specified in the packet of
information received.
Some of these firewalls were ASIC-based firewalls, which employed the use of solid-state
microchips, with built-in packet-filtering technology.
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