Redundancy

I am in the throes of putting a network design together for a new location.  The plan is to virtualize everything, including our AD box, phones, etc...

In the event that the line ever goes down and the local computers need to authenticate or access the virtual AD box, what would happen on a Windows Network?  Would it be advisable to have a local on prem AD box to alleviate those worries?  What case examples are you experts familiar with in handling a fallen line where most resources have been virtualized?  Any insight in this regard would be most appreciated.
al4629740Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
Redundancy is all about reducing the single points of failure.

Good Practice would always have at least two Active Directory Domain Controllers, serving AD, DHCP and DNS.

In the event of failure of a single DC, user would not be able to login, obtain IP Addresses or DNS requests.

In the event the line goes down, what line, why not have two lines, or a backup if the single line fails ?
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al4629740Author Commented:
I agree on a second line.  We are thinking of utilizing SDWAN
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Alyson SparksCommented:
Thanks, Andrew. Now I will use two lines.
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