DHCP protocol uses what protocol to transmit packets

As shown in the figure, the network administrator wants to manually aggregate the two physical links between the SWA and the SWB into an Eth-Trunk link.
The correct one is ().

When a router enabled with Proxy ARP function receives an ARP request packet and finds that the requested IP address not its own, what actions are performed (Multiple Choice)

In the VRP to configure Frame Relay sub-interface, optional interface type which sub-

In the PPPoE discovery stage, the PPPoE server assigns a session-id to the PPPoE client in which packet?