more basic components text

still in limbo.

documentation/design-documentation/chapters/chapter04.tex

@@ -6,7 +6,11 @@
 
 This section discusses the basic conceptual organization forms for data networks, as this seems to not clear in many contexts. 
 
+\subsection{Principal Network Domain (PND)}
 
+Any network consists out of basic components that are the collection of devices (called hosts later on) used to form such particular network. These components, let it be any device attached to this network and the (physical) links, with their control-, data-, and management planes form the Principal Network Domain (PND). A specific network controller is in control of the specific components of a network. 
+
+The differentiation between the PND and the following definitions of network domain, IP network, etc is important for the design of a network controller that is supervising a network in its whole. The PND is the concept used by the network controller to keep track of all hosts and links associated~\footnote{XXXwhat means \emph{associated} exactly?} to this controller. 
 
 \section{Building Blocks}
 \label{ch:conceptual-design:collection}

documentation/design-documentation/gfx/goSDN-Conceptual-Structures.drawio

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