Disable DNS Client through registry:
Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Dnscache,
Locate the Start registry key and change its value from 2 (Automatic) to 4 (Disabled)
Disable DNS client through command line:
REG add "HKLM\SYSTEM\CurrentControlSet\services\Dnscache" /v Start /t REG_DWORD /d 4 /f