How does Spectrum get the hostname of a device?

Document ID : KB000073571
Last Modified Date : 15/03/2018
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Why am I getting a different hostname for a device when looking up an IP?
Spectrum will use the sysName if the model naming order is configured to use that first.
sysName is set on the device itself.

If DNS is preferred, the modeling naming order should be changed to use name service first.