The correct answer is Port mirroring, as it is designed to send copies of network packets seen on one or more ports (or an entire VLAN) to a network monitoring connection on another port. Other options like VLAN tagging and Spanning Tree Protocol (STP) serve different functions. VLAN tagging is used to manage bandwidth by separating network traffic, while STP is used to prevent network loops.
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What is port mirroring?
How does VLAN tagging work and how is it different from port mirroring?
What role does the Spanning Tree Protocol (STP) play in networking?