- Implement security policies at a single point
- Monitor security-related events (audit, log)
- Provide strong authentication for access control purpose
What a Firewall cannot do
1.Protect against attacks that bypass the firewall
- Dial-out from internal host to an ISP
2.Protect against internal threats
- disgruntled employee
- Insider cooperates with an external attacker
3.Protect against the transfer of virus infected programs or files
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