Designing Infoblox for multi-site

[#1]

Dears

I would like to dsign my multi site organization with infoblox on premises appliances without a cloud blox one becz cloud is not allowed, how would i design for 5000 users with HQ --2000 users and other 4 sites with 500 users each site.

If any reference guide can be shared will be much appreciated.

Option 1: Without a Authoritative DNS for the organization means it is with ISP

Option 2: with a Authoritative DNS on premises.

Thanks

[#2]

You need to engage your Infoblox supplier and ask them for some professional services to help you with this, it's impossible to make any recommendations without detailed knowledge of your environment.