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Any decision process must be guided by the ability to obtain data about the status of the system. In a typical network, devices from different vendors, with different functionalities, different capabilities, different administrative domains create heterogeneous scenarios where collecting data calls for standardized instruments and tools. Often this heterogeneity produces custom solutions provided by each vendor, offering advanced and proprietary solutions to interact with the different and custom devices. Here we present an overview of the major standard protocols that allow one to collect data from network devices, leaving custom solutions out of this description.