script syntax in nmap

["Mike ." <dmciscobgp () hotmail com>]

hello all
maybe i am asking a dumb question here, i do apologize. i assumed when one used a script call on it's own like this :   
nmap -n -Pn -vv -T4 -max-retries 1 -reason -script=dns-service-discovery 192.168.0.12 it would then know AUTOMATICALLY 
to fill in the proper port and protocol so we wouldn't have to. instead of me adding the 5353/udp, i just thought it 
would realize the user wants to fire off an EXACT script at a target and we would obviously be after the port/ports it 
affected. am i reading this wrong?
mike

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