Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Digital Literacy

Posted by Charlie Harcourt
Charlie Harcourt
8,046 Points

The difference between TCP/IP 4 layers and OSI 7 layers and what they do.

I know that tcp/ip has 4 layers but what do they do?

Transport, Transport layer, Internet, Network Access,

AND

OSI has 7 layers but what do they do?

Application, Presentation, Session, Transport, Network, Data Link, Physical,

I know this is more networking but it's important for programmers to know as well and I want to make sure that I have a good understanding of it.

1 Answer

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

The conventional 4 TCP/IP "layers" are Application, Transport, Internet, and Network Access.

The Transport layer is the same in both models, the Internet layer is comparable to layer 3 (Network) in the OSI model. The Network Access layer is equivalent to OSI layers 1 and 2 combined. Finally, the Application layer is similar to OSI layers 5, 6, and 7 combined.