The OSI Model
Layer 7 -‐ Application The layer we see -‐ Google Mail, Twiter, Facebook
Layer 6 -‐ Presentation Encoding and encryption (SSL/TLS)
Layer 5 -‐ Session Communication between devices (Control protocols, tunneling protocols)
Layer 4 -‐ Transport The “post office” layer (TCP segment, UDP datagram)
Layer 3 -‐ Network The routng layer (IP address, router, packet)
Layer 2 -‐ Data Link The switching layer (Frame, MAC address, EUI-‐48, EUI-‐64, Switch)
Layer 1 -‐ Physical Signaling, cabling, connectors (Cable, NIC, Hub)
OSI Mnemonics
• Please Do Not Trust Sales Person’s Answers
• All People Seem To Need Data Processing
• Please Do Not Throw Sausage Pizza Away!
Source: Professor M
Layer 7 -‐ Application The layer we see -‐ Google Mail, Twiter, Facebook
Layer 6 -‐ Presentation Encoding and encryption (SSL/TLS)
Layer 5 -‐ Session Communication between devices (Control protocols, tunneling protocols)
Layer 4 -‐ Transport The “post office” layer (TCP segment, UDP datagram)
Layer 3 -‐ Network The routng layer (IP address, router, packet)
Layer 2 -‐ Data Link The switching layer (Frame, MAC address, EUI-‐48, EUI-‐64, Switch)
Layer 1 -‐ Physical Signaling, cabling, connectors (Cable, NIC, Hub)
OSI Mnemonics
• Please Do Not Trust Sales Person’s Answers
• All People Seem To Need Data Processing
• Please Do Not Throw Sausage Pizza Away!
Source: Professor M
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