\documentclass[tikz]{standalone}
\usetikzlibrary{positioning}
\begin{document}
-\begin{tikzpicture}[node distance=1em,nodes={rectangle,draw,minimum width=10em}]
+\begin{tikzpicture}[node distance=3em,nodes={rectangle,draw,minimum width=12em}]
% \node (0) [dotted] {Business layer};
% \node (1) [below=of 0] {Presentation layer};
- \node (1) [] {Presentation layer};
- \node (2) [below=of 1] {Application layer};
- \node (3) [below=of 2] {Network layer};
- \node (4) [below=of 3] {Perception layer};
+ \node (1) [] {Presentation};
+ \node (2) [below=of 1] {Application};
+% \node (3) [below=of 2] {Network layer};
+ \node (3) [below=of 2] {Perception};
-% \draw [<->] (0) -- (1);
\draw [<->] (1) -- (2);
\draw [<->] (2) -- (3);
- \draw [<->] (3) -- (4);
+
+ \draw [fill=white]
+ ([xshift=1em,yshift=-2em]1.south west)
+ -- ([xshift=1em,yshift=-1em]1.south west)
+ -- ([yshift=-1em,xshift=1em]1.south east)
+ -- ([xshift=1em]1.north east)
+ -- ([xshift=3em]1.north east)
+ -- node [draw=none,midway,sloped,below,yshift=-2pt] {Network} ([xshift=3em]3.south east)
+ -- ([xshift=1em]3.south east)
+ -- ([yshift=1em,xshift=1em]3.north east)
+ -- ([xshift=1em,yshift=1em]3.north west)
+ -- ([xshift=1em,yshift=2em]3.north west)
+ -- ([yshift=2em,xshift=1em]3.north east)
+ -- ([yshift=-2em,xshift=1em]1.south east)
+ -- cycle;
+ ;
\end{tikzpicture}
\end{document}