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OSI Model | Packets | Glossaries | IPv4 Address Classes | Subnetting | Powershell


7 Layer Model      5 Layer Model
# Layer Name Protocol Protocol Data Unit Addressing      # Layer Name Protocol Protocol Data Unit Addressing
7 Application HTTP,SMTP,etc... Messages n/a 5 Application HTTP,SMTP,etc... Messages n/a
6 Presentation ASCII, MPEG Data n/a
5 Session NetBois Data n/a
4 Transport TCP/UDP Segment Port #'s 4 Transport TCP/UDP Segment Port #'s
3 Network IP Packet/datagram IP Address 3 Network IP Packet/datagram IP Address
2 Data Link Ethernet, Wi-Fi Frames MAC Address 2 Data Link Ethernet, Wi-Fi Frames MAC Address
1 Physical n/a Bits n/a 1 Physical n/a Bits n/a
Application: Receives information directly from users and displays incoming data to the user
Presentation: Represents the preparation or translation of application format to network format, or from 
               network formatting to application format
Session: Where two computers or other networked devices need to speak with one another
Transport: Deals with the coordination of the data transfer between end systems and hosts; how much data 
           to send, at what rate, where it goes, etc
Network: Responsible for packet forwarding, including routing through different routers
Data Link: Provides node-to-node data transfer and also handles error correction from the physical layer
Physical: Represents the electrical and physical representation of the system: cable type, radio frequency, 
          layout of pins, voltages