Skip to main content

OSI: Open Systems Interconnect Layer

7 Layers​

1. Physical​

The physical layer defines the means of transmitting raw bits over a physical data link connecting network nodes.

Controls communication between one device and the next immediately connected device, on the immediate physical link.

  • PDU: Frame
  • Addressing Scheme: MAC

3. Network​

Controls communication between broadcast domains.

  • PDU: Packet
  • Addressing Scheme: IP

4. Transport​

Controls communication between end hosts/devices, which can be either reliable or not.

  • PDU: Segment
  • Addressing Scheme: Ports

5. Session​

6. Presentation​

7. Application​