DHCP Server's DNS Tab

Was watching my CBT videos on DHCP and the instructor didn't really explain it that well what these following options in the DHCP server's properties - DNS tab:

Dynamically update DNS A and PTR records only if requested by the DHCP clients

Always dynamically update DNS A and PTR records

The MSPress book for 291 says this:
If the first option, the default, is selected, the DHCP server attempts to update resource records only according to the client's request.

My question is: what request?

Can someone explain it to me in other terms. Thanks!


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