Referenzmodelle und Protokolle der Netzwerktechnologie - InfoTip Kompendium
OSI Schichten
Grundlagen Computernetze
Controlling Traffic and the OSI Reference Model :: Chapter 2. Introduction to Firewalls :: Part I: Security Overview and Firewalls :: Router firewall security :: Networking :: eTutorials.org
OSI-Modell
OSI Model: Physical,Data-link,Network,Transport,Session,Prest.,Applic.
What is OSI Model & 7 OSI Layers Explanation
The OSI Reference Model | Cisco Router Configuration (2nd Edition)