DHCP Group of Four Questions
Refer to the exhibit. Using the information shown, answer the question
Question 1:
All hosts in the networks have been operational for several hours when the DHCP server goes down. What happens to the hosts that have obtained service from the DHCP server?
A – The hosts will not be able to communicate with any other hosts.
B – The hosts will continue to communicate normally for a period of time.
C – The hosts will be able to communicate with hosts outsides their own network
D – The hosts will only be able to communicate with other hosts by IP address not by hostname
Answer: B
Explanation:
DHCP often uses dynamic allocation mechanism to save IP addresses, which assigns an IP address to a client for a limited period of time. So when the DHCP server goes down, that client can still use the allocated IP address for a period of time
Question 2:
What is the purpose of the DHCP server?
A – to provide storage for email
B – to translate URLs to IP addresses
C – to translate IPv4 addresses to MAC addresses
D – to provide an IP configuration information to hosts
Answer: D
Explanation:
The main purpose of the DHCP server is to provide IP configuration parameters to hosts such as the default gateway, domain name, Domain Name System (DNS) server…
Question 3:
How is the message sent from a PC2 when is first powers on and attempts to contact the DHCP Server?
A – Layer 3 unicast
B – Layer 3 broadcast
C – Layer 3 multicast
D – Without any Layer 3 encapsulation
Answer: B
Explanation:
When a client boots up for the first time, it transmits a DHCPDISCOVER message on its local physical subnet. Because the client has no way of knowing the subnet to which it belongs, the DHCPDISCOVER is an all-subnets broadcast (destination IP address of 255.255.255.255, which is a layer 3 broadcast address). The client does not have a configured IP address, so the source IP address of 0.0.0.0 is used.
Question 4:
What is the default behavior of R1 when PC1 requests service from DHCP server?
A – Drop the request
B – Broadcast the request to R2 and R3
C – Forward the request to R2
D – Broadcast the request to R2, R3 and ISP
Answer: A
Explanation:
When PC1 requests service from DHCP server (for example, it requests an IP address), it sends a broadcast packet. But R1 router, by default, will not forward broadcast packet and drop it.
For your information, if you want to use the DHCP server from another network (like in this case) you can use the ip helper-address command which will make the router forward UDP broadcasts.
In the real exam you will be taken to a LAB simulation environment but it is, in fact, just a group of 4 multi-choice questions!
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had a doubt in last question… why the router drops the broadcast packet…is it because it doesnt knows the route to the network in which server lies…
then how does in real life ,dhcp ip assignment done…it’s(DHCP server) there on every network ???
plz some1 clear my doubt
@Kundan : According to the very basic operation of a router it doesn’t forward broadcast of any sort. That is why we use a router to separate one broadcast domain from another. In another words each port of a router is a separate broadcast domain. Similarly each port of a switch is a collision domain.
@ kundan
Just like what Arosha said, it is in the design of a router to separate broadcast domains otherwise this whole world would be one network! Holy cow!!
In a large network, you can have separate DHCP servers for every IP subnet. But if that’s not the case and you have 1 DHCP machine serving different networks, you can configure the router to forward DHCP broadcasts or use what’s known as a DHCP Relay Agent.
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Can anyone please explain to me DHCP operation and L2 addressing….SOME books say that DHCP use L2 addresses to learn about a DHCP server in the network…
THANKS TO ALL…
I love it.. I find this so helpful..
When a DHCP server is configured, which two IP addresses should never be assignable to
hosts? (Choose two.)
A. network or subnetwork IP address
B. broadcast address on the network
C. IP address leased to the LAN
D. IP address used by the interfaces
E. manually assigned address to the clients
F. designated IP address to the DHCP server
This is a really triky question. I don’t know what is right answer from ABF. The response of ACME is AB but i am not sure is right.
@ Theos
V. Tricky
May be the DHCP server by itself is part of the hosts, so you pick the addresses that are available to hosts not the restricted ones( I.e from choices A & B)
In order for the network in Q4 to ever work, the IP helper-address command has to have been assigned. Otherwise PC1 is not a DHCP client.
Therefore R1 absolutley must forward DHCP request. Otherwise PC1 will never get an IP address.
*However*
The question asks what the router DEFAULT behavior is.
All routers default behavior is to drop DHCP requests.
Theos,
the question is indeed very tricky. I think that following CISCO logic the trick is in word “assignable”, the question is not about “should never be assigned”
I will try this in a lab, but don’t think that the server will not let you assign an already manually configured address, or one of the routers interfaces address or even one of it’s own address. This would definetly cause ip address conflict, but the server or router doesn’t take care of that, rather that the admin should.
But a network address or a broadcast address can’t be configured on a an interface. At least it’s not so obvious and not every OS can do that.
Please, someone correct me if i’m wrong.
Theese kind of questions i’m compeletely scared by on an exam!
thanzzzzzzz
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please i dont understand DHCP operation and L2 addressing,any explaination pls
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a host and a dhcp server resides on a different subnet although connected physically on the same switch.. can a host receive dhcp’s ip config from dhcp server? just wondering with the statement mentioned above ..”the DHCPDISCOVER is an all-subnets broadcast (destination IP address of 255.255.255.255, which is a layer 3 broadcast address). “
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Question 4
If R1 drops the packet, how will the DHCP server get the DHCP request from PC1?
@Cisco
default behavior is the key part of that question…
It will not recieve it set to default behavior,
that is why you need to configure the router.
default behavior drops all packets
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Re Theos Question below, I saw this question on test and it threw me off. I believe A & B are the correct answer but E & F seem equally valid. Any thoughts?
When a DHCP server is configured, which two IP addresses should never be assignable to
hosts? (Choose two.)
A. network or subnetwork IP address
B. broadcast address on the network
C. IP address leased to the LAN
D. IP address used by the interfaces
E. manually assigned address to the clients
F. designated IP address to the DHCP server
“For your information, if you want to use the DHCP server from another network (like in this case) you can use the ip helper-address command which will make the router forward UDP broadcasts.”
It isn’t correct. The router will use unicast, because he knows where the Server is’ as a result of ip helper-address command
@Rogues Pierre,
When a DHCP server is configured, which two IP addresses should never be assignable to
hosts? (Choose two.)
A. network or subnetwork IP address
B. broadcast address on the network
C. IP address leased to the LAN
D. IP address used by the interfaces
E. manually assigned address to the clients
F. designated IP address to the DHCP server
—————–
A,B Correct,
C. not correct, we just configure dhcp-server, we don’t have any ip adress leased
D. Dhcp perform conflict check, so if we already asigned 1 ip to interface, it’s automatically not able to be leased. not correct
E. we can do this, but the question is ‘ ip addressed should never assigned’, not correct
F. Not sure with the statement, but it same with D.. not correct