Passive reconnaissance: The process of collecting information about an intended target of a malicious hack without the target knowing what is occurring. Typical passive reconnaissance can include physical observation of an enterprise's building, sorting through discarded computer equipment in an attempt to find equipment that contains data or discarded paper with usernames and passwords, eavesdropping on employee conversations, researching the target through common Internet tools such as Whois, impersonating an employee in an attempt to collect information, and packet sniffing.
passive monitoring or active monitoring. Passive monitoring is simply the ability to listen to network traffic and log it. Active monitoring involves the ability to either:
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Monitor traffic and then send alerts concerning the traffic that is discovered
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Actually intercept and block this traffic
https://www.sciencedirect.com/topics/computer-science/passive-monitoring
https://www.sciencedirect.com/topics/computer-science/passive-reconnaissance
"In the tools that we are likely to see used in passive reconnaissance, we will find various scanning tools, such as network sniffers for both wired and wireless networks, port scanners, vulnerability analysis tools, operating system fingerprinting tools, banner grabbing tools, and other similar utilities."
A- Passive Reconnaissance
if you're going to suggest an answer, please provide some resources to confirm your answer. the question indicates it is just listening, as mad said previously, exploiting indicates that it is active.
https://whatis.techtarget.com/definition/passive-reconnaissance
Wireshark is a “protocol analyzer”, but it uses only passive observation of network traffic.
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