
Policy
Policy
Engine
Engine
NDIS
TCP/IP Stack
ISA 2004 Architecture
ISA 2004 Architecture
Firewall Engine
Firewall Engine
Firewall
Firewall
service
service
Application Filter API
App
App
Filter
Filter
Web Proxy Filter
Web Proxy Filter
Web Filter API (ISAPI)
Web
filter
Web
filter
User
Mode
Kernel
Mode
SMTP
SMTP
Filter
Filter
RPC
RPC
Filter
Filter
DNS
DNS
Filter
Filter
Policy
Store
Packet layer
filtering
1
Protocol layer
filtering
2
Application
layer filtering
3
Kernel mode
data pump:
Performance
optimization
4
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