TO SOME NETWORK ADMINISTRATORS, A FIREWALL is the key component of their infrastructure’s security. To others, a firewall is a hassle and a barrier to accomplishing essential tasks. In most cases, the negative view of firewalls stems from a basic misunderstanding of the nature of firewalls—their purpose and functions.
This chapter clearly defines the fundamentals of firewalls. These include what a firewall is, what a firewall does, how it performs these tasks, why firewalls are necessary, what the various types of firewalls are, and how filtering mechanisms work. Once you understand ...
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