Which tool would BEST allow the administrator to inspect what type of traffic is on the network?

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A network administrator notices that all of the company switches are running at capacity on a given day, which is abnormal according to network baselines taken recently.

Which tool would BEST allow the administrator to inspect what type of traffic is on the network?
A . Wire tap
B . Network sniffer
C . Load balancing appliance
D . NIPS

Answer: B