Your network contains an Active Directory domain named adatum.com. The domain contains a domain
controller named DC1. DC1 has an IP address of 192.168.200.100.
You need to identify the zone that contains the Pointer (PTR) record for DC1.
Which zone should you identify?

A.
adatum.com

B.
_msdcs.adatum.com

C.
100.168.192.in-addr.arpa

D.
200.168.192.in-addr.arpa

Explanation:
Reference 1:
MCTS 70-640 Cert Guide: Windows Server 2008 Active Directory, Configuring (Pearson IT Certification, 2010)
page 57
Reverse lookup: This occurs when a client computer knows the IP address of another computer and requires
its hostname, which can be found in the DNS serversPTR (pointer) resource record.
Reference 2:
MCTS 70-640 Cert Guide: Windows Server 2008 Active Directory, Configuring (Pearson IT Certification, 2010)
page 45/730
You are configuring a reverse lookup zone for your network, which uses the Class C network address range of
192.168.5.0/24. Which of the following addresses should you use for the reverse lookup zone?
a. 5.168.192.in-addr.arpa
b. 0.5.168.192.in-addr.arpa
c. 192.168.5.in-addr.arpa
d. 192.168.5.0.in-addr.arpa
The reverse lookup zone contains octets of the network portion of the IP address in reverse sequence and uses
a special domain name ending in in-addr.arpa.Thus the correct address is 5.168.192.in-addr.arpa. You do not
use the host portion of the IP address, so 0.5.168.192.in-addr.arpa is incorrect. The octets must be specified in
reverse sequence, so the other two choices are bothincorrect.