nmap host alive or not

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http://serverfault.com – After performing nmap sweep ping : nmap –sP –n 128.235.32,18.100 What would be the output message provided by nmap? How do I would know if the nmap find these host alive or not ? I am doing my hw and I wrote a Wireshark filter to display packets , I have captured 8 packets and I do not know how to determine if the scanned host are alive or not. (HowTos)