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OSI Model Simplified

OSI layer Mnemonic
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Application layer - aka layer 7 PDU Message Example: Browser ID= GUI
Presentation layer - aka layer 6 PDU Message Example ClientSide Scriting ID= Content-Type
Session layer -aka layer 5 PDU Message Example: Server-Side scripting ID= 
Transport layer - aka Layer 4 PDU Datagram/Segment Example: TCP/UDP ID=Port
Network Layer - aka Layer 3: PDU Packet Example : Router ID= IP
Data/link layer - aka Layer 2: PDU Frame. Example Switch. ID=MAC
Physical Layer - aka Layer 1 : PDU bit. Example : Hub ID=Signal







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