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Ethical Hacking and Penetration Testing Guide
The output shows 0% packet loss with three packets sent and received, indicating that the
target is indeed alive. We can also use udp to perform host discovery; what option you would like
to use is up to you.
Alternatively, we can also use the –sP flag query to accomplish this task, because when you
specify the –sP flag query with nmap, it sends not only icmp echo requests but also TCP SYN to
port 80 and 443. Therefore, it will also show the host as up or in other words alive.
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