Your network contains an Active Directory domain named contoso.com. The domain contains a DHCP server
named Server1 that runs Windows Server 2012 R2.
You create a DHCP scope named Scope1. The scope has a start address of 192.168.1.10, an end address of
192.168.1.50, and a subnet mask of 255.255.255.192.
You need to ensure that Scope1 has a subnet mask of 255.255.255.0.
What should you do first?
A.
From the DHCP console, reconcile Scope1.
B.
From the DHCP console, delete Scope1.
C.
From the DHCP console, modify the Scope Options of Scope1.
D.
From Windows PowerShell, run the Set-DhcpServerv4Scope cmdlet.
Explanation:
Set-DhcpServerv4Scope
Sets the properties of an existing IPv4 scope on the Dynamic Host Configuration Protocol (DHCP) server
service.
After you create a scope in DHCP, the subnet option is greyed out, you can not change it.
You can change the starting and ending ip addresses, but not the subnet mask.
So, the only option you have left is to delete it and create a new one with the right subnet.
Another answer or equivilant from other dumps would be
From Windows PowerShell, run the Remove-DhcpServerv4Scope cmdlet.