OSI Model

Application (Layer 7)

User Interface (Teamviewer)

Presentation (Layer 6)

Presents data and handles encryption processing (Data format)

Session (Layer 5)

Keeps different app data separate. Handles authorization and authentication

Transportation (Layer 4)

End to End Communication (TCP and UDP) (PDU TCP: Segment) (PDU UDP: Datagram)

Networking (Layer 3)

Provides logical addressing (Network/IP address, interface, metric) (Routers), Packet (PDU: Packet) (TCP Segment header and UDP datagram header)

Data Link (Layer 2)

Access to media using MAC address and combines packets into bytes and bytes into frames (Switch) (PDU: Frame)

Physical (Layer 1)

Moves bits between devices (Hub) PDU (Protocol Data Unit: Bit)