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Network Layers and Protocols

OSI Model

Network Layers and Protocols

OSI Model

Layer Name Purpose Protocols mnemonic
Application Human Machine Interface – Where data is entered, Connects application to network DNS,HTTP,SMTP,POP3,FTP All
Presentation Data coded into 1s and 0s, or decoded, depending on file format JPEG,MIDI,TIFF,SSL,SSH People
Session Where secure sessions created, authentication takes place NetBIOS, Seem
Transport Error checking it conducted here. Chooses which transport protocol to use TCP,UDP,End-toEnd To
Network  Addressing and Routing IPV4,IPV6,IPSec Need
Data-Link This layer is where the data is prepared for sending Ethernet,PPP,ATM Data
Physical  Data is physically sent along a wire, fiber optic cable or radio waves. Ethernet, USB, Bluetooth,IEEE802.11 Processing

Activity – Watch the video below and fill out the worksheet (in the resources section) as you go through.

Protocols

Packet Switching

Resources