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A '''data monitoring switch''' is a networking hardware appliance that provides a pool of monitoring tools with access to traffic from a large number of network links. It provides a combination of functionality that may include aggregating monitoring traffic from multiple links, regenerating traffic to multiple tools, pre-filtering traffic to offload tools, and directing traffic according to one-to-one and many-to-many port mappings.
Data monitoring switches enable organizations to use their monitoring tools more efficiently, to centralize traffic monitoring functions, and to share tools and traffic access between groups. Some of these devices also provide functionality that helps justify tool purchases and simplify deployment and management of the device itself. For more information on the problem these products solve, refer to EMA's market research summary: Monitoring Optimization 2010 <ref>[http://www.anuesystems.com/Resources_ToolOptimizer_EMAMonitoringOptimization2010.shtml Monitoring Optimization 2010]</ref>.
Several other terms have been used to describe this class of device, including '''data access switch''', '''tool aggregator''', '''net tool optimizer''', and '''distributed filter tap'''.
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