TCP/IP and the OSI Model – The Transport (Host-to-Host) Layer

If you recall from Chapter 1, we’ve already spent some time looking at connection-oriented and connectionless protocols. At the Host-to-host layer of the TCP/IP model, two primary protocols exist – Transmission Control Protocol (TCP) and User Datagram Protocol (UDP).

Author: Dan DiNicolo

Dan DiNicolo is a freelance author, consultant, trainer, and the managing editor of He is the author of the CCNA Study Guide found on this site, as well as many books including the PC Magazine titles Windows XP Security Solutions and Windows Vista Security Solutions. Click here to contact Dan.