HOTSPOT
Your network contains two Active Directory sites named MainSite and DRSite.
You have an Exchange Server 2013 organization that contains two servers. The servers are configured as
shown in the following table.
The active copy of DB1 is located on EX1. There are typically 100 MB of log files queued on EX1.
You need to recommend a procedure to allow administrators to mount the mailbox database copies on EX2 if
EX1 fails. The recovery point objective (RPO) for mailbox data is 200 MB.
Which command should you recommend running? (To answer, select the appropriate options in the answerarea.)
Hot Area:
Answer: 
Explanation:
http://technet.microsoft.com/en-gb/library/dd298068(v=exchg.150).aspx
The MountDialOverride parameter is used to override the auto database mount dial
(AutoDatabaseMountDial) setting for the target server and specify an alternate setting. The following are
possible values:
None
When using this value, the currently configured auto database mount dial setting on the target server will be
used.
Lossless
This is the default value. When using this value, the database doesn’t automatically mount until all log files that
were generated on the original active copy have been copied to the passive copy.
GoodAvailability If you specify this value, the database automatically mounts immediately after a failover if the
copy queue length is less than or equal to 6. If the copy queue length is greater than 6, the database doesn’t
automatically mount. When the copy queue length is less than or equal to 6, Microsoft Exchange attempts to
replicate the remaining logs to the passive copy and then mounts the database.
BestEffort
If you specify this value, the database automatically mounts regardless of the size of the copy queue length.
Because the database will mount with any amount of log loss, using this value could result in a large amount of
data loss.
BestAvailability
If you specify this value, the database automatically mounts immediately after a failover if the copy queue length
is less than or equal to 12. The copy queue length is the number of logs recognized by the passive copy that
needs to be replicated. If the copy queue length is more than 12, the database doesn’t automatically mount.
When the copy queue length is less than or equal to 12, Exchange attempts to replicate the remaining logs to
the passive copy and then mounts the database