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We still follow the 80/20 rule, as there is still a need to reserve a recommended 20% of a scope’s addresses for the hot standby.The main difference now is scope settings and options replication between DHCP partner servers.The default behaviour is to allow zone transfers to any host.While on its face this may seem an excessively friendly default, DNS data is essentially public (that's why its there) and the bad guys can get all of it anyway.
It is not a big deal to manipulate a Windows system if you can get physical access to it.
We no longer need to re-create the scope and manually adjust options on the second server.
Another benefit is that the partner server can automatically take full ownership of the scope, if the primary servers is lost.
The failover DHCP cluster is defined and configured at the scope level.
And unlike most other high-availability failover configurations available on Windows Servers, it does not use the Failover Clustering feature.
The default behaviour is to allow zone updates only from the masters IP(s).