In a splitter, you use a device that duplicates all traffic with one copy continuing to its intended destinations and the other showing on a screen or going to a file. Port mirroring offers a method of duplicating network traffic and directing the copy towards a data store. You would need a sophisticated network traffic analysis tool to aggregate and summarize all traffic data. In these instances, you would be better off using NetFlow to sample data from several network points simultaneously. Other tools are better suited to giving you a whole network visibility. In order to properly assess the performance of your network, you are going to categorize all traffic by network device anyway, so it is better to use port mirroring on a device-by-device basis. If you could capture all incoming and outgoing packets you would become overwhelmed by all of the collected data. Although you might want to see all network traffic, capturing all of it all at once soon becomes an overambitious goal.
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December 2022
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