TCP/IP Suite

Conceptual model and set of communications protocols used in the Internet and other networks.

Known as TCP/IP because those are two of the foundational protocols in the suite.

Developed by the United States Department of Defense through DARPA.

Similar structure to the OSI Model, but with fewer layers.

This is the model actually in use in modern networks.

NOTE: the OSI model still influences how network engineers think and talk about networks.

OSI vs. TCP/IP

OSI Model	TCP/IP Suite
Application	Application
Presentation	"
Session	"
Transport	Transport
Network	Internet
Data Link	Link
Physical	"

Data Flow