Scenario: You are the administrator for a mid-sized company that uses Windows 2003 and Windows Server 2008 domain controllers. Your plan is to eventually upgrade all domain controllers to Windows Server 2016. The five sites you have are not fully routed and there have been some problems with regards to replicating Active Directory data. Your budget will not allow you to add additional links or purchase additional equipment.
Question: What can you do to improve the efficiency of replications within your network?