Which statement is correct regarding the operation of DHCP?
A.
A DHCP client uses a ping to detect address conflicts.
B.
A DHCP server uses a gratuitous ARP to detect DHCP clients.
C.
A DHCP client uses a gratuitous ARP to detect a DHCP server.
D.
If an address conflict is detected, the address is removed from the pool and an administrator must resolve the conflict.
E.
If an address conflict is detected, the address removed from the pool for an amount of time configurable by the administrator.
F.
If an address conflict is detected, the address is removed from the pool and will not be reused until server is rebooted.
is D
The answer is D.
Ref: http://www.cisco.com/en/US/docs/ios/12_1/iproute/configuration/guide/1cddhcp.html
“Configuring a DHCP Database Agent or Disabling DHCP Conflict Logging
A DHCP database agent is any host, for example, an FTP, TFTP, or RCP server that stores the DHCP bindings database. You can configure multiple DHCP database agents and you can configure the interval between database updates and transfers for each agent.
Automatic bindings are IP addresses that have been automatically mapped to the MAC addresses of hosts that are found in the DHCP database. Automatic bindings are stored on a database agent. The bindings are saved as text records for easy maintenance.
An address conflict occurs when two hosts use the same IP address. During address assignment, DHCP checks for conflicts using ping and gratuitous ARP. If a conflict is detected, the address is removed from the pool. The address will not be assigned until the administrator resolves the conflict. “