4 ConclusionsWireless sensor networks are a new area of research, hav<strong>in</strong>g many open issues <strong>and</strong>challenges due to the strict constra<strong>in</strong>ts of their resources. Although multihopcommunication protocols of mobile Ad-Hoc networks have many solutions to propose,only a few of them are applicable for a WSN. <strong>In</strong> this paper we focused on two goals. Thefirst one was to <strong>in</strong>troduce the reader to the network<strong>in</strong>g issues of a WSN <strong>and</strong> po<strong>in</strong>t out thenecessity of data nam<strong>in</strong>g <strong>and</strong> data-centric rout<strong>in</strong>g approaches. The second goal was topresent several data-centric oriented techniques that achieve reduction of traffic <strong>in</strong>side thenetwork <strong>and</strong> thus save energy. These techniques are referred to as <strong>Data</strong> <strong>Aggregation</strong>techniques <strong>and</strong> critical past research has been devoted to them. Although many of thesetechniques look promis<strong>in</strong>g, there are still many challenges that need to be addressed.
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