deletions | additions       diff --git a/Abstraction.tex b/Abstraction.tex  index f4686d8..c5de58f 100644  --- a/Abstraction.tex  +++ b/Abstraction.tex 
...
\subsection{Abstraction}  Through the work done at Stanford and Berkely  In the SDN architecture, the control and data planes are decoupled, network intelligence and state are logically centralized, and the underlying network infrastructure is abstracted from the applications  Talk about breaking down the network into abstractions.  \begin{itemize}  \item Virtual Topology