Hi,
Generally, the Failover cluster mainly used for Hyper V cluster, Exchange cluster, SQL cluster.
For roles not included in Failover cluster roles, such as DNS, IIS, they have their fault-tolerant solution.
As far as I know, such as DNS server, if the DNS server is AD integrated, Active Directory will automatically replicate DNS information to other DNS servers that are installed on Active Directory Domain Controllers. For non-AD integrated zones, use zone transfer to sync DNS records.
As for IIS, you may turn to IIS forum for more information about how to realize the fault-tolerant:
https://learn.microsoft.com/en-us/answers/topics/windows-server-iis-general.html
Thanks for your time!
Best Regards,
Anne
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