Planning and Design Considerations
You must carefully plan DHCP on your network to avoid future problems that could result in users who are unable to access network resources. Specifically, consider the following elements:
DHCP servers. DHCP servers should be highly available, so you should consider deploying multiple DHCP servers to provide redundancy. Although you can locate a DHCP server across a WAN link, you must determine whether to accept the risk that a WAN outage will cause the DHCP server to be unavailable.
DHCP relay agents. To contact a DHCP server, DHCP clients broadcast a message to the local network segment. To enable DHCP clients to contact DHCP servers on other network segments, configure DHCP relay agents on every network segment ...
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