What is a passive attack in network security?

• A passive network assault is one in which a system is monitored and occasionally checked for open ports and vulnerabilities. The goal of a passive assault is to gather knowledge about the target system without taking any direct action against it.
• Active and passive reconnaissance are examples of passive attacks. Reconnaissance is a military phrase that refers to the process of exploring hostile territory in order to obtain intelligence. Reconnaissance is the act of examining a system or network in order to acquire information before launching a complete attack in the context of computer security.

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