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Front Back
Upper-to-Lower (7 to 1)
All People Seem To Need Data Processing
Loweer-to-Upper (1 to 70
Please Do Not Throw Sausage Pizza Away
Layer 7
Application - End User, Application-Proxy Firewall
Layer 6
Presentation - Encryption & Compression
Layer 5
Session - SSL (Layers 5-7)
Layer 4
Transport - TCP or UDP (connection-oriented or -less)
Layer 3
Network - Logical Address (IP or IPX), ICMP Routers
Layer 2
Data Link - MAC/Physical Address, NIC, Switches
Layer 1
Physical - 0's & 1's, cables, Hubs
x of y cards