This paper introduces the SLAmeter network metering tool, which constitutes an alternative solution to the network traffic monitoring tools based on the IPFIX protocol. The main purpose of the SLAmeter is to offer a reliable possibility to track and fulfill the conditions specified in the Service Level Agreement subscribed between the subscriber and provider. SLAmeter was designed with the extension of the BasicMeter tool and consists of several components on different layers.

This paper deals with the activities of the MONICA research group of the Computer Networks Laboratory at the Technical University of Košice in Slovakia. MONICA stands for the Monitoring and Optimization of Network Infrastructures, Communications and Applications. Our main areas of interest are related to development of the BasicMeter tool built in conformity with the IPFIX architecture. In this paper we give an overview of our solution and proposal of several enhancements over the scope of IPFIX, such as time synchronization for the One-Way Delay measurements, the protocol for direct communication with the analyzing application, the centralized management of the monitoring platform, and support for real-time monitoring.

Software maintenance presents nowadays one of the most critical phases of software system life cycle. Constant changes of system's requirements or changes related to occurrences of system defects caused that thorough system understanding in order of efficient realization of system's modifications becomes now an inevitable part of maintenance process.In this paper, we emphasize the importance of system's comprehension in the context of an early detection of system's defects by offering the description of its life cycle and classification, but mainly by introducing the principles of architectural knowledge concept. We also propose a new approach of dealing with one of the currently most serious obstacles inhibiting this concept from its further use -the problem of architectural knowledge automatic acquisition.Index Terms-Knowledge, software defect life cycle, software maintenance, architectural knowledge, architectural knowledge acquisition process.

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