70-663 · Question #76
70-663 Question #76: Real Exam Question with Answer & Explanation
The correct answer is C. Configure a database availability group (DAG) that includes Server1 and Server2.. The DAG will give you the mailbox redundancy and a 5 minute TTL will allow you to change the DNS record to point to the other mailbox server allowing the clients to refresh their DNS and connect after 5 minutes. CCR is not a part of Exchange 2010, NLB doesn't give mailbox redunda
Question
Options
- AConfigure cluster continuous replication (CCR). Implement a file share witness.
- BConfigure a Network Load Balancing cluster that includes Server1 and Server2.
- CConfigure a database availability group (DAG) that includes Server1 and Server2.
- DConfigure a database availability group (DAG) that includes Server1 and Server2.
Explanation
The DAG will give you the mailbox redundancy and a 5 minute TTL will allow you to change the DNS record to point to the other mailbox server allowing the clients to refresh their DNS and connect after 5 minutes. CCR is not a part of Exchange 2010, NLB doesn't give mailbox redundancy and the certificate has nothing to do with any kind of redundancy between servers. One important thing to have in mind during a complete site failover is DNS delays. DNS updates can take from minutes to several hours depending on the topology and DNS TTL values specified for DNS records used by Exchange. To reduce the delays, it's important you configure internal and external DNS records used for Exchange with a low TTL value (five minutes is a good best recovery/designing-site-resilient-exchange-2010-solution-part2.html
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