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If you want the router to use X.X.X.X as its NTP server and then fall back to Y.Y.Y.Y- the exact command to be used is:
ntp server X.X.X.X prefer
ntp sever X.X.X.X
ntp server X.X.X.X primary
ntp server X.X.X.X fallback
The full command would be ntp server Y.Y.Y.Y ntp server X.X.X.X prefer
This question has absolutely nothing to do with CEH.
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