I have a question about subnetting and DHCP Scopes.  If you have say four subnets on your network can you setup four DHCP scopes and have your DHCP server manage the IP address assignments for all of them or do you have to set up a DHCP Relay Agent for each subnet?  Thanks for your help.

Michael T.

It depends on your network structure. If you need more subnets of different physical networks, then Relay Agent is needed.

This may help to understand RA

https://technet.microsoft.com/en-us/library/cc779610(v=ws.10).aspx

Regards

Milos

You will need to configure dhcp relay agent / IP helper address on router interfaces connected to the clients' subnets. Without IP helpers / relay agents, DHCP server will receive DHCP requests from local subnet only (the subnet directly connected to DHCP server). If the subnets are isolated  (no routing of traffic between clients' subnets and the network that hosts DHCP server), then you can add additional NICs to your DHCP server and connect these to clients' subnets, so that DHCP server will be able to receive broadcasts from all clients.