noun
a tool or software used to capture and analyze network traffic
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A packet sniffer is a tool used for capturing and analyzing network traffic.
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I used a packet sniffer to see what data was being sent over the network.
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Dude, I ran a packet sniffer on my wifi and found out my roommate was hogging all the bandwidth.
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She was like a packet sniffer, always picking up on subtle cues and messages in conversations.