When you place multiple interfaces (ethernet, wlan) into a bridge, the bridge interface becomes the logical Layer 3 interface. Any IP-related services (e.g., DHCP server, firewall rules) must be applied to the bridge interface, not the individual ports.
A.✘Incorrect – IP services are not bound to physical ports in a bridged setup.
B.✘Incorrect – DHCP works perfectly in this setup.
C.✘Incorrect – The bridge ports are Layer 2; DHCP must bind to the Layer 3 bridge interface.
D.✔Correct – Configure the DHCP server on the bridge interface.
Extract from Official MTCNA Course Material – Bridging and DHCP:
“When using a bridge interface with multiple ports, IP services (like DHCP) must be bound to the bridge itself.”
Extract from René Meneses MTCNA Study Guide – Bridging Concepts:
“DHCP server should be created on the bridge interface if it includes both wireless and ethernet clients.”
Extract from MikroTik Wiki – DHCP Server:
“Always assign the DHCP server to the bridge interface when clients are behind bridged ports.”
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