Port Mirroring, also known as SPAN (Switched Port Analyzer), is a method of monitoring network traffic. With port mirroring enabled, the switch sends a copy of all network packets seen on one port (or an entire VLAN) to another port, where the packet can be analyzed.
Port Mirroring features, which is supported in nearly all enterprise class switches (managed switches), allows other computers to see a network traffic which is not visible to them in general case.
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