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{{Short description|Networking Hardware Appliance}}
<ref name=":0" />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.<ref>{{Cite web|title=Arista EOS® Precision Data Analysis with DANZ|url=https://www.arista.com/en/solutions/precision-data-analysis-of-network-traffic|last=Sabeesh|date=2017-10-24|website=Arista Networks|language=en-gb|access-date=2020-05-23}}</ref>
Data monitoring switches enable organizations to use their monitoring tools more efficiently, centralize traffic monitoring functions, and 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.
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External interfaces are also available as follows:
*A platform (Windows) based server; this interface is preferred for managing a large number of devices through a single interface
*Third-party [[SNMP]] management tools; this interface in preferred in environments with centralized SNMP management systems such as [[IBM Tivoli]] or [[HP OpenView]] <ref name=":0">[http://www.HP.com/Go/openview HP Open View]</ref>
== Advantages ==
* Data monitoring switches facilitate centralizing network traffic monitoring in the [[Network operations center|NOC]].
* By providing remote monitoring and control, they save the time and expense of traveling to remote locations to install monitoring tools.▼
* They make it easier to share tools among groups.▼
▲By providing remote monitoring and control, they save the time and expense of traveling to remote locations to install monitoring tools.
* With data rate conversion capabilities, they enable 1 Gigabit tool to support 10 Gigabit links, and 10 Gigabit tools to monitor traffic aggregated from multiple 1 Gigabit links.
* They prevent tool oversubscription by pre-filtering traffic. ▼
▲They make it easier to share tools among groups.
* They can
* Because of their high port densities compared to discreet Taps, they save rack space and power and can have a lower price per port.▼
▲With data rate conversion capabilities, they enable 1 Gigabit tool to support 10 Gigabit links, and 10 Gigabit tools to monitor traffic aggregated from multiple 1 Gigabit links.
* They are fully passive and unable to disrupt network traffic in the most commonly found circumstances. (Integrated Taps, if present have fail-to-wire on power failure.) This is compared to SPAN ports, where network traffic can be disrupted if the switch is not properly configured while setting up the SPAN port.<ref>[http://www.ebizq.net/topics/business_service_management/features/11496.html?page=1 Integrating Monitoring Access Into The Network Architecture]</ref>▼
▲They prevent tool oversubscription by pre-filtering traffic.
▲They can Tap network links directly, instead of relying on switch [[SPAN port]]s for monitoring access.
▲Because of their high port densities compared to discreet Taps, they save rack space and power and can have a lower price per port.
▲They are fully passive and unable to disrupt network traffic in the most commonly found circumstances. (Integrated Taps, if present have fail-to-wire on power failure.) This is compared to SPAN ports, where network traffic can be disrupted if the switch is not properly configured while setting up the SPAN port.<ref>[http://www.ebizq.net/topics/business_service_management/features/11496.html?page=1 Integrating Monitoring Access Into The Network Architecture]</ref>
== Disadvantages ==
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