Your network contains an Active Directory forest named contoso.com and two Active Directory sites
named Site1 and Site2. You plan to deploy an Exchange Server 2010 Service Pack 1 (SP1)
organization. An independent consultant recommends a design for the Exchange Server 2010 SP1
deployment as shown in the following table.
You are evaluating the implementation of a Network Load Balancing cluster on the Exchange servers.
You need to identify which potential Exchange server configuration will prevent the implementation
of the Network Load Balancing cluster. What should you identify?
A.
DNS round robin on DC1 and DC2
B.
a database availability group (DAG)
C.
an activation preference for a database
D.
shadow redundancy
E.
EdgeSync synchronization
F.
a single copy cluster (SCC)
G.
Edge Transport server cloned configuration
H.
local continuous replication (LCR) on EX1, EX2, EX3, and EX4
I.
a Hosts file on EX1, EX2, EX3, and EX4
J.
Datacenter Activation Coordination (DAC) mode
K.
a DNS server on DC2
L.
delayed acknowledgments (ACKs)
Explanation:
Before we continue, we need to discuss an important design consideration regarding the load
balancing of the Client Access Server role. In the configuration presented above, the Client Access
Server role is coexisting on the same servers as the Mailbox server role. Since the mailbox servers
are part of a DAG, which itself uses Windows Failover Clustering, it is not possible to implement
Windows Network Load Balancing (WNLB) as the high availability mechanism for the Client Access
Server role. As explained in the Exchange 2010 product documentation, under the section titled
“Two-member DAG in Single Datacenter/Active Directory Site”, this is because WNLB and Windows
Failover Clustering cannot be installed on the same server. Therefore, in this particular configuration,
an external load balancing solution will be required, although that particular facet of configuration is
outside the scope of this article.
http://www.simple-talk.com/sysadmin/exchange/exchange-2010-dag-creation-and-configurationpart-1/