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Thanks for the reply, sorry you're right my Q is unclear, it's a DHCP and DNS mix of settings. I'll check out the links.
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Win 2012 R2 domain<br />
3 X DNS servers all AD integrated<br />
500 internal PCs across 8 scopes<br />
Occasionally a guest may plug a laptop into one of the scopes above and need IP etc<br />
1 scope of wireless clients which may have 1000 clients<br />
<br />
Can u please advise on these DNS Qs<br />
1. Lots of sites advise Lease period = refresh + no refresh, so that's easy I'll have 6, 3 and 3...OK? Not too worried about IPs running out. <br />
2. Given numbers above what should scavenging period be? Not too worried about server processing this, scopes are small.<br />
3. Should this scavenging period be set the same on the scope and server?<br />
4. Given the setup above what update setting should I use, secure only, or secure and Unknown?<br />
<br />
Thanks
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Win 2012 R2 domain
3 X DNS servers all AD integrated
500 internal PCs across 8 scopes
Occasionally a guest may plug a laptop into one of the scopes above and need IP etc
1 scope of wireless clients which may have 1000 clients

Can u please advise on these DNS Qs
1. Lots of sites advise Lease period = refresh + no refresh, so that's easy I'll have 6, 3 and 3...OK? Not too worried about IPs running out. 
2. Given numbers above what should scavenging period be? Not too worried about server processing this, scopes are small.
3. Should this scavenging period be set the same on the scope and server?
4. Given the setup above what update setting should I use, secure only, or secure and Unknown?

Thanks

DNS Config

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

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.