A firewall is an essential part of any security infrastructure. Every host needs a firewall. A traditional network needs border firewalls. Firewalls are concentrations of security, and they are easily recognizable embodiments of an organization’s security policy. However, a firewall on its own is an incomplete security solution.
A complete security solution requires many more components (FIGURE 13-1) than just a firewall. Proper understanding of the organization’s essential processes, threats, and goals will guide you toward the creation an effective security plan. Without a proper risk assessment, however, recommendations for safeguards and countermeasures are just guesses.
FIGURE 13-1 Firewalls: ...
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