CCNA – DHCP Questions
Here you will find answers to DHCP Questions
Question 1
Refer to the exhibit. Which rule does the DHCP server use when there is an IP address conflict?
A. The address is removed from the pool until the conflict is resolved.
B. The address remains in the pool until the conflict is resolved.
C. Only the IP detected by Gratuitous ARP is removed from the pool.
D. Only the IP detected by Ping is removed from the pool.
E. The IP will be shown, even after the conflict is resolved.
Answer: A
Question 2
How dose a DHCP server dynamically assign IP address to host?
A. Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.
B. Addresses are assigned for a fixed period of time. At the end of period, a new quest for an address must be made, and another address is then assigned.
C. Addresses are leased to host. A host will usually keep the same address by periodically contacting the DHCP sever to renew the lease.
D. Addresses are permanently assigned so that the host uses the same address at all times.
Answer: C
Question 3
Which two tasks does the Dynamic Host Configuration Protocol perform? (Choose two)
A. Set the IP gateway to be used by the network.
B. Perform host discovery used DHCPDISCOVER message.
C. Configure IP address parameters from DHCP server to a host.
D. Provide an easy management of layer 3 devices.
E. Monitor IP performance using the DHCP server.
F. Assign and renew IP address from the default pool.
Answer: C F
Question 4
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 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 server is rebooted.
Answer: D
Explanation
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.
(Reference: http://www.cisco.com/en/US/docs/ios/12_1/iproute/configuration/guide/1cddhcp.html)
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About Q4: Some dumps says the correct answer is E. Can somebody explain & give the correct answer. I am confused.
How dose a DHCP server dynamically assign IP address to host?
A. Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.
B. Addresses are assigned for a fixed period of time. At the end of period, a new quest for an address must be made, and another address is then assigned.
C. Addresses are leased to host. A host will usually keep the same address by periodically contacting the DHCP sever to renew the lease.
D. Addresses are permanently assigned so that the host uses the same address at all times.
please explain C. thanks guys.
@ALMIRA- its is bec of the term LEASED TO HOST, meaning ip used by the host was not permanently assigned.Hope it help u.
A. Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.
B. Addresses are assigned for a fixed period of time. At the end of period, a new quest for an address must be made, and another address is then assigned.
C. Addresses are leased to host. A host will usually keep the same
Can someone please explain me the concept of DHCP-Relay!!!
DID IT!!…907…thx 9tut!!!!..CCNA certified….tons of questions from this site…read from top to bottom every question, because you will not know what pops up…q3 on exam…good luck to all!!
@3
Which two tasks does the Dynamic Host Configuration Protocol perform? (Choose two)
A. Set the IP gateway to be used by the network.
B. Perform host discovery used DHCPDISCOVER message.
C. Configure IP address parameters from DHCP server to a host.
D. Provide an easy management of layer 3 devices.
E. Monitor IP performance using the DHCP server.
F. Assign and renew IP address from the default pool.
why answer “A” wrong ???????
@amila
Hey Amila are you Sri Lankan :) ?
DHCP’s main objective is to Assign IP address to hosts from the Given param.(Ip pool etc)
and Renew / Assign to Hosts in LAN. Assigning the IP address of the Default Gateway is optional configuration. ” I think “
hey guys i jst want to ask 1 q………r the qs on this site being updated regularly………???
Hi adminCan you pls update? The cerroct answer is D.CCNA Exploration 4.0, Book 4: Accessing the WAN, Page: 7.1.8.1 The show ip dhcp conflict command displays all address conflicts recorded by the DHCP server. The server uses the ping command to detect conflicts. The client uses Address Resolution Protocol (ARP) to detect clients. If an address conflict is detected, the address is removed from the pool and not assigned until an administrator resolves the conflict.
@amila
Answer A. is close to correctness but still wrong because the DHCP Server doesn’t assign IP gateway to the network, but assign IP gateway to the DHCP client.
@Quophie
I agree. A could imply that the hosts may configure the gateway themselves.
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Which two tasks does the Dynamic Host Configuration Protocol perform? (Choose two)
A. Set the IP gateway to be used by the network.
B. Perform host discovery used DHCPDISCOVER message.
C. Configure IP address parameters from DHCP server to a host.
D. Provide an easy management of layer 3 devices.
E. Monitor IP performance using the DHCP server.
F. Assign and renew IP address from the default pool.
Answer CF
What ‘default’ pool is used with DHCP? I thought you had to define a custom pool for DHCP to work. Can someone explain this??
There is conflicting answers about the DHCP question? According to other answers it is E? Can someone please assist?
@Kazza
If a similar question comes up in the exam it will be articulated better than it has been here. Just be aware that B & E are definatley incorrect for now!
Hello @9tut or anyone who wish to comment.
Regarding question 4, testking has the very same question but it says the correct answer is E, not D.
Which would be the right?.
Thanks.
I quote testking explanation:
“By default, the CISCO IOS DHCP server 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 server 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.”
testking also provide a reference for this answer:
http://www.cisco.com/en/US/docs/ios/12_2t/12_2t8/feature/guide/ftondhcp.html
This is kind of confussing, I don’t know what answer to chose as the right one!!.
@Niranjan the the explaination is in this link provided by 9tut http://www.cisco.com/en/US/docs/ios/12_1/iproute/configuration/guide/1cddhcp.html
Correct answer is D.
hi everyone!
Which statement is correct regarding the operation of DHCP?
a. If an address conflict is detected, the address is removed from the pool and an administrator must resolve the conflict.
b. If an address conflict is detected, the address is removed from the pool for an amount of time configurable by the administrator.
Which one is true??? At 9tut the answer is a , at Brar the answer is b. I am not sure what is right!!!
I HAVE A DOUBT… CAN ANY PASSED ENGINEER PLEASE ANSWER IT ?
IN THE CCNA EXAM, CAN WE SKIP ANY UNKNOWN ANSWER ? OR DO WE HAVE TO ANSWER ALL FROM 1 TO 50 QUESTIONS CONTINUOSLY WITHOUT SKIP ?
THANKS
@any one
yes, you can skip
@atr
The answer is a. it is explained on the link that 9tut provided.
The explanation quoted by Cesar states that you can configure the amount of timeout or ping packets sent by the dhcp server before it allocates an address to reduce the possibility of an address conflict but it does not include the scenario after a dhcp conflict is detected which the link given by 9tut explains.
Thanks.
@xyz
but in every dump answer is B, for which answer we should go by…..
Hi all
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PLEASE tell me?
Thanks
If you would like to see a packet tracer example for DHCP, a good example is on the below website…
http://ipcisco.com/router-dhcp-configuration-with-packet-tracer/
please send latest dumps to vijayavigneshwar@gmail.com . my exam is scheduled in a month
TY 9tut.
Today I have passed the CCNA. (860/825)
50 questions 3 labs (VTP, EIGRP, ACL). 35 from 9tut.
Also thanks a lot Brar and Sekhar (still valid from examcollection)
Ty again 9tut
from here none
What is the correct answer to question 4? Is it D or E? Can someone or 9tut clear up this issue because the answer varies depending on the site you are using like sekbar.
Today I have passed with 960/1000……..Thanks to GOD
Thanks to 9TUT …….Sekhar……P4S
Hi, my exam is scheduled i a view week , please send letatest dumps to masbag1@gmail.com
@9tut
Sorry that i’m diturbing you
but Please help me I’m going to take exam soon
Question 4
Which statement is correct regarding the operation of DHCP?
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.
It is upto Administator to Resolve Conflict ot not
I hv seen this question in many dumps …
about 4 to 5 Dumps answer is E
Can you please help me because i can not trust dumps but i can trust you ??/
please help me
@Kevin: As I said the answer is D, you can read more here: http://www.cisco.com/en/US/docs/ios/12_1/iproute/configuration/guide/1cddhcp.html
@KEvin 9tut is right if Cisco is meant. your choice ‘E’ is also right in terms of Microsoft technology. So dont get confused. You must choose ‘D’ according to Cisco requirement and not Microsoft.
Thanks
Hi guys!
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Hi All,
Can anyone explain me know if the DHCP offer is a broadcast or unicast?
Thanks,
Majeed.
Valid Que :D
Q:3
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