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Discovery Scans-  How does the scanner determine which port(s) to use?

Question asked by Daniel Adaramola on Jan 5, 2017
Latest reply on Jan 6, 2017 by Busby

I just completed Discovery scan on 10.0.0.0/20 address block. Looking at the result, I noticed Qualys discovery method vary from ICMP;TCPPort 22;TCPPort 111;TCPPort 443;UDPPort 111;TCP RST. Depending on the device in the address block, Qualys utilises single of few combination of these ports (discovery methods)... My Question is: how does the scanner determine which set of port(s) to limit discovery on? 

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