Content Security
NETWORK B
NETWORK A
Network Services
System
Services
Appl
& DBs
Physical / Data
Transport Layer
Data -Link Layer
Network / Internet
Layer
Transport Layer
Session Layer
Presentation Layer
Application Layer
Firewall
Encryption
Does Not Change Data
May Change Data
Network Services
System
Services
Appl
& DBs
Physical / Data
Transport Layer
Data -Link Layer
Network / Internet
Layer
Transport Layer
Session Layer
Presentation Layer
Application Layer
CONTENT
USER
USER
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