Your company has a main office and a branch office. The main office has a domain controller named
DC1 that hosts a DNS primary zone. The branch office has a DNS server named SRV1 that hosts a
DNS secondary zone. All client computers are configured to use their local server for DNS resolution.
You change the IP address of an existing server named SRV2 in the main office. You need to ensure
that SRV1 reflects the change immediately.
What should you do?

A.
Restart the DNS Server service on DC1.

B.
Run the dnscmd command by using the /zonerefresh option on DC1.

C.
Run the dnscmd command by using the /zonerefresh option on SRV1.

D.
Set the refresh interval to 10 minutes on the Start of Authority (SOA) record.

Explanation:
Dnscmd zonerefresh
Forces a secondary DNS zone to update from the master.
Syntax
dnscmd ServerName /zonerefresh ZoneName
Parameters
ServerName: Specifies the DNS server the administrator plans to manage, represented by IP address,
FQDN,
or Host name. If omitted, the local server is used.
ZoneName: Specifies the name of the zone to be refreshed.
Remarks:

The zonerefresh operation forces a check of the version number in the master’s SOA record. If the
version number on the master is higher than the secondary’s version number, then a zone transfer is
initiated, updating the secondary server. If the version number is the same, no zone transfer occurs.
*The forced check occurs by default every 15 minutes. To change the default, use the dnscmd config
refreshinterval operation.