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diff --git a/its/tex/itsroot.tex b/its/tex/itsroot.tex
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@@ -66,6 +66,9 @@
 	\tableofcontents
 	\newpage
 	
+	\include{osi}
+	\newpage
+	
 	\include{ipv46}
 	\newpage
 	
diff --git a/its/tex/osi.tex b/its/tex/osi.tex
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+%Notizen:
+
+\section{OSI Schichtenmodell}
+	Das OSI Schichtenmodell (Open Systems Interconnection Model) ist ein Referenzmodell für Netzwerkprotokolle.
+	
+	\subsection{Modell}
+		
+		\begin{tabular}{l | l | l | l}
+			\# & OSI-Schicht & Beispiele & Kopplungselemente \\
+			\hline
+			7 &Anwendungen (Application) & HTTP, FTP, SMTP, LDAP & Gateway, Proxy, Content-Switch \\
+			
+			6 & Darstellung (Presentation) & HTTP, FTP, SMTP, LDAP & Gateway, Proxy, Content-Switch \\
+			
+			5 & Sitzung (Session) & HTTP, FTP, SMTP, LDAP & Gateway, Proxy, Content-Switch \\
+
+			4 & Transport (Transport) & TCP, UDP & Gateway, Proxy, Content-Switch \\
+			
+			3 & Vermittlung (Network) & ICMP, IP, IPsec & Router, Layer-3-Switch \\
+			
+			2 & Sicherung (Data Link) & Ethernet, Token Ring, MAC & Bridge, Layer-2-Switch \\
+			
+			1 & Bitübertragung (Physical) & Ethernet, Token Ring, MAC & Netzwerkkabel, Repeater, Hub \\
+		\end{tabular}
+	
+\section{Protokollstack}
+	
+	
\ No newline at end of file