Servers dependent on Active Directory

I had a Domain Controller (that also ran DNS) go down which caused problems
with systems I thought were independent of AD. This highlighted the fact that
other teams within IT had installed a lot of servers that used AD services
like DNS, LDAP, etc which I wasn't told about. These dependencies on AD based
services are very difficult to track down.

My question is, how can I find out what servers are accessing my DCs/DNS
servers, etc without going round all 200+ of them, looking at applications,
and so on.
For example, is there an easy way to log LDAP lookups occuring on DCs?

Once I have this finished, I can tell what is affected the next time I need
to down a server.

Thanks,
Iain
.

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