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Secure will allow only Domain joined computers to register DNS entries as well as changing IP address (i.e. computer got different IP from DHCP). &nbsp;Allowing non-secure could result in non-domain devices registering/changing entries which is not a good practice.
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Secure will allow only Domain joined computers to register DNS entries as well as changing IP address (i.e. computer got different IP from DHCP).  Allowing non-secure could result in non-domain devices registering/changing entries which is not a good practice.

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Thanks Mohammed, I was wondering what happens to old dns records from non-joined systems (ie. firewalls, router switches, printers) ? All these items &nbsp;will have to be manually added in the future, right?
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Thanks Mohammed, I was wondering what happens to old dns records from non-joined systems (ie. firewalls, router switches, printers) ? All these items  will have to be manually added in the future, right?

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I've requested that this question be closed as follows:<br />
<br />
Accepted answer: 0 points for Waldosharp's comment <a href="https://www.experts-exchange.com/questions/28923446/Windows-Server-2008-Turning-on-Secure-update-in-a-large-domain.html?anchorAnswerId=41447457#a41447457" rel="ugc">#a41447457</a><br />
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for the following reason:<br />
<br />
This is a good answer, I just looking for a little bit more of what happens to current DNS records.
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I've requested that this question be closed as follows:

Accepted answer: 0 points for Waldosharp's comment #a41447457 [https://www.experts-exchange.com/questions/28923446/Windows-Server-2008-Turning-on-Secure-update-in-a-large-domain.html?anchorAnswerId=41447457#a41447457]

for the following reason:

This is a good answer, I just looking for a little bit more of what happens to current DNS records.

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He &nbsp;Answer my questions.
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Hi,<br />
<br />
I just became a Admin in a large Domain, I notice that on the DNS that under Dynamic updates is set to &quot;Nonsecure and secure&quot;. What kind of problems could I have if I change it to &quot;Secure only?&quot; Any information on this would be helpful. Thanks
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Hi,

I just became a Admin in a large Domain, I notice that on the DNS that under Dynamic updates is set to "Nonsecure and secure". What kind of problems could I have if I change it to "Secure only?" Any information on this would be helpful. Thanks

Windows Server 2008 Turning on Secure update in  a large 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.