The ip helper-address server-ip subcommand tells the router to do which of the following?
A) Watch for incoming DHCP messages, with destination IP address 0.0.0.0.
B) Change the incoming packet's source IP address to the router's incoming interface IP address.
C) Change the outgoing packet's source IP address to the address of the DHCP server.
D) Route the modified packet to the DHCP server.
B, D
Explanation: B) When an incoming DHCP message is received, it will have destination 255.255.255.255. The source IP should be changed to the router's incoming IP interface, and the destination should be changed to the DHCP server, where the modified packet should be routed.
D) When an incoming DHCP message is received, it will have destination 255.255.255.255. The source IP should be changed to the router's incoming IP interface, and the destination should be changed to the DHCP server, where the modified packet should be routed.
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