Which statement is correct regarding the operation of DHCP?
A.
A DHCP client uses a ping to detect address conficts.
B.
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 is 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 the seiver is rebooted.
Explanation:
By default, the Cisco IOS DHCP seiver attempts to verify address availability by performing a ping operation to the address before allocation. The default DHCP ping configuration will wait for 2 seconds for an ICMP echo reply. This default configuration results in the DHCP seiver servicing one address request every 2 seconds. The number of ping packets being sent and the ping timeout are configurable. Thus, to reduce the address allocation time, you can reduce either the timeout or the number of ping packets sent. Reducing the timeout or the ping packets being sent will improve the address allocation time, at the cost of less ability to detect duplicate addresses.Incorrect answers:
C: DHCP client does not detect a DHCP server. It broadcasts a DHCP request.
F: If a conflict is detected, the address is removed fora configurable amount of time only.
D: If a conflict is detected, the address is removed for a configurable amount of time only.
B: DHCP server never detects DHCP clients.
A: DHCP client does not use ping to detect address conflicts.
This is D
“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. “
http://www.cisco.com/en/US/docs/ios/12_1/iproute/configuration/guide/1cddhcp.html
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Yes, the answer is : D
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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.
Source Offical Cisco Material
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The answer is D (not with time)
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Agreed with the option D, not with the given answer!!!
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