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For successful deployment of a wireless sensor network, reliable communication between the networks’ nodes is crucial. When communication and other wireless sensor networks constraints are taken into account, networks can be analyzed efficiently. The diagnosis of the network's operation can be done using the information gathered by the sensor nodes in the network. This paper discusses wireless sensor network diagnostics, describes so-called neighbourtables used to collect diagnostic data of the wireless CiNet network and the construction of them using the synchronization and management messages. The neighbourtables are embedded to the CiNet network cross-layer architecture and this solution results to relatively small energy overhead consumption caused by them. The information stored in neighbourtables can be used to monitor network behavior and to improve networks' packet routing and fault recognizing for the nodes, in both, nodes' and centralized applications' point of view.