Back in 1989, the first firewall was introduced by the ATT Bell Labs. It performed stateful packet inspection based on technology developed by engineers from Digital Equipment Corporation (DEC) a year before. However, things are not as clear as they appear as far as the father of the firewall is concerned because many researchers have contributed to what evolved into todays network security solution that offers protection both as a software and as a hardware-based system. One thi…
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