In a setup where wireless and ethernet client interfaces are bridged, where must the DHCP service be configured?

In a bridged setup where both wireless and Ethernet interfaces are combined into a single bridge, the DHCP service must be configured only on the bridge interface. This is because when multiple interfaces are bridged, they essentially function as a single logical interface. As a result, DHCP requests from clients connected through either the wireless or Ethernet interface will be forwarded to the DHCP server through the bridge interface.

Configuring the DHCP service directly on the bridge interface allows for a centralized approach to managing IP addresses that are distributed to clients. It ensures that all devices connected to the bridge can receive their DHCP leases without the need for separate DHCP configurations on each individual port of the bridge. This minimizes redundancy and simplifies the network management process.

The other options suggest configuring DHCP in ways that are unnecessary or invalid in a bridged context, which could lead to redundant configurations or complications in the network's operation. By implementing DHCP on the bridge interface, all clients benefit from a singular, coherent address allocation process.