the TCP/IP subsection added

analytical.tex

@@ -88,3 +88,8 @@ The measurement devices, from now on called \textbf{client nodes} will consist o
 %\item Make the web-server accessible remotely via \gls{ddsn} service
 %\item Make the server automatically discover all nodes and configure them
 
+\subsection{The TCP/IP networking protocol}
+
+\Gls{tcpip} consists of two layers. The higher layer, \gls{tcp}, manages the assembling of a message or file into smaller packets that are transmitted over the Internet and received by a \gls{tcp} layer that reassembles the packets into the original message. The lower layer, \gls{ip}, handles the address part of each packet so that it gets to the right destination. Each gateway computer / device on the network checks this address to see where to forward the message. Even though some packets from the same message are routed differently than others, they'll be reassembled at the destination.
+
+\Gls{tcpip} uses the client/server model of communication in which a computer user (a client) requests and is provided a service (such as sending a Web page) by another computer (a server) in the network. TCP/IP communication is primarily point-to-point, meaning each communication is from one point (or host computer) in the network to another point or host computer. TCP/IP and the higher-level applications that use it are collectively said to be \textit{stateless} because each client request is considered a new request unrelated to any previous one (unlike ordinary phone conversations that require a dedicated connection for the call duration). Being stateless frees network paths so that everyone can use them continuously.