OSI Model Layer
Physical Layer
Hardware means of sending and receiving data
Data Link Layer
Include medium access control (MAC) and logical link control (LLC)
- MAC: control how a computer on the network gains access to the data
- LLC: control flow control, error checking
Network Layer
Provide switching, routing
- IP
Transport Layer
Provide transfer of data between end systems
- TCP, UDP
Session Layer
Establishes, manages and terminates connections between applications
Presentation Layer
transform data into the form that the application layer can accept
- ASCII, GIF, MPEG
Application Layer
Supports application and end-user processes
- HTTP, SMTP, FTP, etc