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I suggest you to read this<br />
<a href="https://technet.microsoft.com/en-us/library/dd298067(v=exchg.150).aspx" rel="ugc">https://technet.microsoft.com/en-us/library/dd298067(v=exchg.150).aspx</a>
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I suggest you to read this
https://technet.microsoft.com/en-us/library/dd298067(v=exchg.150).aspx [https://technet.microsoft.com/en-us/library/dd298067(v=exchg.150).aspx]

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How failover and switch over occurs on DAG.<br />
<br />
IF there are 3 mailbox servers consisting of 2000 users , how traffic is routed from internet to user mailbox in dag.<br />
<br />
can you let me know in context of exchange 2010 DAG and EXCHANGE 2013.
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How failover and switch over occurs on DAG.

IF there are 3 mailbox servers consisting of 2000 users , how traffic is routed from internet to user mailbox in dag.

can you let me know in context of exchange 2010 DAG and EXCHANGE 2013.

EXCHANGE , 2010,2013 DAG

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.