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So what is the reason for the 2nd DNS? &nbsp;For redundancy I assume. &nbsp;Then why not to have the 2nd DC as well with DNS on it? 
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So what is the reason for the 2nd DNS?  For redundancy I assume.  Then why not to have the 2nd DC as well with DNS on it?

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If you install DNS on a DC, the benefits is AD Integrated zones.<br />
AD Integrated zones are writable (not like prmary/secondary)<br />
Data will be stored in AD database, and AD replication will replicate the DNS as well.
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If you install DNS on a DC, the benefits is AD Integrated zones.
AD Integrated zones are writable (not like prmary/secondary)
Data will be stored in AD database, and AD replication will replicate the DNS as well.

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My environment is pretty small (about 5 people), but I mainly wan this since I may periodically reboot my DC for something and wish to have a secondary DNS server so the internet doesn't go down while the server reboots. &nbsp;I could do a second DC, but that is way above what I need at this time. &nbsp;Does it have to be AD integrated to replicate with the one on the DC?
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My environment is pretty small (about 5 people), but I mainly wan this since I may periodically reboot my DC for something and wish to have a secondary DNS server so the internet doesn't go down while the server reboots.  I could do a second DC, but that is way above what I need at this time.  Does it have to be AD integrated to replicate with the one on the DC?

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What is the process to set up replication so that the two servers sync if the second one is not a DC? &nbsp;
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What is the process to set up replication so that the two servers sync if the second one is not a DC?  

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You may want to make it a separate question and add points.
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You may want to make it a separate question and add points.

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I have a domain and currently have only one DNS server and that is also my DC. &nbsp;I would like to have another DNS server in my environment. &nbsp;Does this need to be promoted to DC as well to setup the proper replication?
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I have a domain and currently have only one DNS server and that is also my DC.  I would like to have another DNS server in my environment.  Does this need to be promoted to DC as well to setup the proper replication?

Does DNS have to be on a DC in a domain?

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.