HOTSPOT
Your network contains an Active Directory domain named contoso.com. The domain contains two
Active Directory sites named Site1 and Site2.
You need to configure the replication between the sites to occur by using change notification.
Which attribute should you modify?
Answer: 
Explanation:
Active Directory Replication Change Notification
* Right-click the site link object for the sites for which you want to enable change notification, and
then click Properties.
* In the Select a property to view box, select options.
* In the Edit Attribute box, if the Value(s) box shows <not set> , type 1 in the Edit Attribute box.
* Click OK.
Active Directory Replication: Change Notification & You
