HOTSPOT
Your network contains an Active Directory forest. The forest contains two sites named Site1 and Site2.
You have an Exchange Server 2013 organization. Site1 contains two Mailbox servers and one Client Access
server. Site2 contains two Mailbox servers and two Client Access servers.
You need to prevent messages that cannot be protected by shadow redundancy from being delivered.
What command should you run? (To answer, select the appropriate options in the answer area.)
Hot Area:
Answer: 
Explanation:
http://technet.microsoft.com/en-us/library/bb124151(v=exchg.150).aspx
RejectMessageOnShadowFailure : The RejectMessageOnShadowFailure parameter accepts or rejects
messages when a shadow copy of a message can’t be created. Valid input for this parameter is $true or $false.
The default value is $true.
When this parameter is set to $true, messages are rejected with the SMTP code 450 4.5.1. When this
parameter is set to $false, the message is accepted without making a shadow copy.
The number of attempts to make a shadow copy of the message and where to make the shadow copy are
controlled by the MaxRetriesForLocalSiteShadow, MaxRetriesForRemoteSiteShadow, and
ShadowMessagePreferenceSetting parameter settings.