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i am not able to understand the same with links any written explanation,<br />
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is director server required in this scenario?
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i am not able to understand the same with links any written explanation,

is director server required in this scenario?

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is fronted server has capability to understand or identify that this user belong to this particular pool or something else require for the same.
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is fronted server has capability to understand or identify that this user belong to this particular pool or something else require for the same.

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I'm not trying to be rude here but have you read the Lync implementation documentation at all? &nbsp;Everything you are asking is clearly explained there in.<br />
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You will need a Domain COntroller, as the servers will belong to the domain and your user account will be created in AD.
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I'm not trying to be rude here but have you read the Lync implementation documentation at all?  Everything you are asking is clearly explained there in.

You will need a Domain COntroller, as the servers will belong to the domain and your user account will be created in AD.

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if will be having several pools on my fronted lync server, then how user authentication will work.
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if will be having several pools on my fronted lync server, then how user authentication will work.

lync user authentication will work.

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

Instant messaging (IM) is a type of online chat that offers real-time text transmission over the Internet. A LAN messenger operates in a similar way over a local area network. More advanced instant messaging can add file transfer, clickable hyperlinks, Voice over IP, or video chat. Non-IM types of chat include multicast transmission, usually referred to as "chat rooms". Depending on the IM protocol, the technical architecture can be peer-to-peer (direct point-to-point transmission) or client-server (a central server retransmits messages from the sender to the communication device).