(Preface In today's computer world, the Internet is ubiquitous. To counteract the "unhealthy" Internet, several security mechanisms have been created, such as: access controls, authentication tables, and one of the most important: firewalls. However, firewalls have different meanings for different people. Let us consider the Indian fable of the blind man touching the elephant. Since the parts that each one has touched are different, they have come to different conclusions.)
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