DHCP Sim
[am4show have=’p2;’]
Premium Member: You can try this sim with our simulator here.
[/am4show]
Refer to the topology below and answer the questions.
For your reference, the configurations of these three routers are posted below (unnecessary lines are omitted)
| R1#show running-config ! interface Loopback0 ip address 192.168.250.1 255.255.255.255 ! interface Ethernet0/0 description Link to ISP ip address 209.165.200.225 255.255.255.224 ip nat inside ip virtual-reassembly in ! interface Ethernet0/1 description Link to Server 1 ip address 172.16.200.1 255.255.255.0 ip nat outside ip virtual-reassembly in ! interface Ethernet0/2 description Link to R2 ip address 192.168.10.1 255.255.255.252 ip nat outside ip virtual-reassembly in ! router rip version 2 network 172.16.0.0 network 192.168.10.0 network 192.168.250.0 default-information originate no auto-summary ! ip nat inside source list LOCAL interface Ethernet0/0 overload ip route 0.0.0.0 0.0.0.0 209.165.200.226 ! ip access-list standard LOCAL permit 10.0.0.0 0.255.255.255 permit 172.16.0.0 0.0.255.255 permit 192.168.0.0 0.0.255.255 ! ntp server 209.165.200.226 ! end |
R2#show running-config ! ip dhcp excluded-address 192.168.20.1 ! ip dhcp pool DHCPASSIGN3 network 192.168.20.0 255.255.255.252 ! interface Loopback0 ip address 192.168.250.2 255.255.255.255 ! interface Ethernet0/0 description Link to R3 ip address 192.168.20.1 255.255.255.252 ! interface Ethernet0/2 description Link to R1 ip address 192.168.10.2 255.255.255.252 ip access-group SERVER1BLOCK in ! interface Ethernet0/3 description Link to LAN ip address 10.100.20.1 255.255.255.0 ! router rip version 2 network 10.0.0.0 network 192.168.10.0 network 192.168.20.0 network 192.168.250.0 ! ip access-list standard SERVER1BLOCK deny 172.16.200.0 0.0.0.255 permit any ! ntp server 192.168.100.1 ! end |
| R3#show running-config ! interface Loopback0 ip address 192.168.250.3 255.255.255.255 ! interface Ethernet0/0 description Link to LAN ip address 10.100.10.1 255.255.255.0 ! interface Ethernet0/1 description Link to R2 no ip address ! interface Ethernet0/2 description Link to Server2 ip address 10.100.11.1 255.255.255.0 ! router rip version 2 network 10.0.0.0 network 192.168.20.0 no auto-summary ! end |
| Note: You may see this sim with different errors like Nat Access-list misconfigured , DHCP pool mistyped. So please check the config of the devices carefully and grasp the concept behind to solve them. |
Question 1
Examine the DHCP configuration between R2 and R3, R2 is configured as the DHCP server and R3 as the client. What is the reason R3 is not receiving the IP address via DHCP?
A. On R3, DHCP is not enabled on the interface that is connected to R2.
B. On R3, the interface that is connected to R2 is in shutdown condition.
C. On R2, the interface that is connected to R3 is in shutdown condition.
D. On R2, the network statement in the DHCP pool configuration is incorrectly configured.
Answer: A
Explanation
First we should check which interface on R3 that is connected to R2 via the “show run” command.
From the description we learn interface E0/1 is connected to R2. Use the “show ip interface brief” command to verify the IP address of this interface.
Therefore we can conclude this interface does not have any IP address and there is no configuration on this interface (except the “description Link to R2” line).
If R3 wants to receive an IP address from R2 via DHCP, interface E0/1 should be configured with the command “ip address dhcp” so the answer “DHCP is not enabled on this interface” is correct.
Question 2
R1 router clock is synchronized with ISP router. R2 is supposed to receive NTP updates from R1. But you observe that R2 clock is not synchronized with R1. What is the reason R2 is not receiving NTP updates from R1?
A. R1 router Ethernet interface that is connected to R2 is placed in shutdown condition.
B. R2 router Ethernet interface that is connected to R1 is placed in shutdown condition.
C. The NTP server command not configured on R2 router.
D. The IP address that is used in the NTP configuration on R2 router is incorrect.
Answer: D
Explanation
First we should verify if the ports connected between R1 and R2 is in “up/up” state with the “show ip interface brief” command on R1 & R2.
Note: We learn R1 & R2 connect to each other via E0/2 interface because the IP addresses of these interfaces belong to 192.168.10.0/30 subnet. Both of them are “up/up” so the link connecting between R1 & R2 is good.
Next we need to verify the ntp configuration on R2 with the “show running-config” command.
So there is only one command related to NTP configuration on R2 so we need to check if the IP address of 192.168.100.1 is correct or not. But from the “show ip interface brief” command on R1 we don’t see this IP -> This IP address is not correct. It should be 192.168.10.1 (IP address of interface E0/2 of R1), not 192.168.100.1.
Question 3
Why applications that are installed on PC’s in R2 LAN network 10.100.20.0/24 are unable to communicate with Server1?
A. A standard ACL statement that is configured on R1 is blocking the traffic sourced from R2 LAN network.
B. A standard ACL statement that is configured on R1 is blocking the traffic sourced from Server1 network.
C. A standard ACL statement that is configured on R2 is blocking the traffic sourced from Server1 network.
D. A standard ACL statement that is configured on R2 is blocking the traffic sourced from R2 LAN network.
Answer: C
Explanation
We should check if we can ping from R1 to Server 1 or not:
The ping worked well so maybe R1 is good so we should check R2 first. We notice on R2 there is an access-list:
This access-list is applied to E0/2 interface with inbound direction. The purpose of this access-list is to block traffic with source IP address of 172.16.200.0/24 so it will block all traffic sent from Server 1 to us.
Question 4
Users complain that they are unable to reach internet sites. You are troubleshooting internet connectivity problem at main office. Which statement correctly identifies the problem on Router R1?
A. NAT configurations on the interfaces are incorrectly configured.
B. NAT translation statement incorrectly configured.
C. Interesting traffic for NAT ACL is incorrectly configured.
D. Only static NAT translation configured from the server, missing Dynamic NAT or Dynamic NAT overloading for internal networks.
Answer: A
Explanation
If all users cannot access internet then R1 is most likely to cause the problem so we should check it first. From the “show running-config” command we will see:
We notice that interface E0/0 (connected to ISP) has been configured as “nat inside” while interfaces E0/1 & E0/2 (connected to our company) have been configured as “nat outside”. This is not correct because “nat inside” should be configured with interfaces connected to our company while “nat outside” should be configured with interfaces connected to the internet. Therefore we can conclude the NAT configuration on these interfaces is not correct.
| Note (again): You may see this sim with different errors like Nat Access-list misconfigured , DHCP pool mistyped. So please check the config of the devices carefully and grasp the concept behind to solve them. |
This Simulation is one of the ones i had on my test on December 15th. Thank you for this.
Si esta pregunta la hubiera visto o hubiera conocido la pagina , hubiera aprobado hace mucho tiempo. 🙁
If this question had seen or had known the page, I would have approved a long time ago
thx
This was the first question verbatim that was one my test Jan 10 2017
Hey guys, do they show you output of the commands like “sh run” or you are provided with a simulator and have to find out manually by typing all the commands. Thanks
This is a Simlet so you they give you 4 questions and you have to click on the routers/switches and use the appropriate show commands to get the info yourself. I recommend clicking on all the devices and use show run and show ip int brief and leave it there to save you time. also tabbing to complete statements and ? are usable
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this was on my icnd1 exam last week 🙂 but with different configuration so different correct answers
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Studied Latest dumps from below link
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@Datalink No configs just show commands
This one is still valid but with different configs!
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On the DHCP simulation where are they getting the loopback IP address since I don’t see it in the diagram?
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in the command “ip dhcp pool DHCPASSIGN3”
network 192.168.20.0 255.255.255.252
Isnt that 192.168.20.0 255.255.255.252 looks wrong? because the LAN connected to R3 is 10.100.10.0
Shouldnt that dhcp pool be according to 10.100.10.0?
Second Question:
ON R2 can we give this command “ntp server 209.165.200.226” or is it wrong?
Please help. THANK YOU
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Hello everyone, there are some commands that can also be used to solve the questions, not just “show running-config” and “show ip interface brief”.
For example:
Q2=
//// R1 router clock is synchronized with ISP router
R1#show ntp status
Clock is synchronized, stratum 5, reference is 209.165.200.226 <<<<<<<<<<<
nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**10
ntp uptime is 1469700 (1/100 of seconds), resolution is 4000
reference time is DB989C7E.70624F08 (09:10:38.439 CET Fri Sep 30 2016)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 8.97 msec, peer dispersion is 1.98 msec
loopfilter state is 'CTRL' (Normal Controlled Loop), drift is 0.000000000 s/s
system poll interval is 512, last update was 246 sec ago.
R1#show ntp associations
address ref clock st when poll reach delay offset disp
*~209.165.200.226 127.127.1.1 4 250 512 377 0.000 0.000 1.985 <<<<<<<<<<<
* sys.peer, # selected, + candidate, – outlyer, x fals
//// R2 router clock is unsynchronized and it has a wrong IP address (192.168.100.1)
R2#show ntp status
Clock is unsynchronized, stratum 16, no reference clock <<<<<<<<<<<
nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**10
ntp uptime is 1600600 (1/100 of seconds), resolution is 4000
reference time is 00000000.00000000 (01:00:00.000 CET Mon Jan 1 1900)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 240.10 msec, peer dispersion is 0.00 msec
loopfilter state is 'FSET' (Drift set from file), drift is 0.000000000 s/s
system poll interval is 8, never updated.
R2#show ntp associations
address ref clock st when poll reach delay offset disp
~192.168.100.1 .INIT. 16 – 1024 0 0.000 0.000 15937. <<<<<<<<<<<
* sys.peer, # selected, + candidate, – outlyer, x fals
=====================================================================
Q3=
//// The ACL SERVER1BLOCK deny all hosts of the network 172.16.200.0
R2#show access-list
Standard IP access list SERVER1BLOCK
10 deny 172.16.200.0, wildcard bits 0.0.0.255 (20 matches)
20 permit any (461 matches)
//// This ACL is set in the Inbound interface of R2.
R2#show ip interface Ethernet0/2
Ethernet0/2 is up, line protocol is up
Internet address is 192.168.10.2/30
Broadcast address is 255.255.255.255
Address determined by setup command
MTU is 1500 bytes
Helper address is not set
Directed broadcast forwarding is disabled
Multicast reserved groups joined: 224.0.0.251 224.0.0.9
Outgoing access list is not set
Inbound access list is SERVER1BLOCK <<<<<<<<<<<
Proxy ARP is enabled
.
.
.
IPv4 WCCP Redirect exclude is disabled
=====================================================================
Q4=
//// NAT configurations on the interfaces are incorrectly configured. It should be Outside interface= Ethernet0/0 and Inside interfaces= Ethernet0/1, Ethernet0/2
R1#show ip nat statistics
Total active translations: 0 (0 static, 0 dynamic; 0 extended)
Peak translations: 1, occurred 05:10:34 ago
Outside interfaces:
Ethernet0/1, Ethernet0/2 <<<<<<<<<<<
Inside interfaces:
Ethernet0/0 <<<<<<<<<<<
Hits: 62 Misses: 0
CEF Translated packets: 5, CEF Punted packets: 0
Expired translations: 2
Dynamic mappings:
— Inside Source
[Id: 1] access-list LOCAL interface Ethernet0/0 refcount 0
Total doors: 0
Appl doors: 0
Normal doors: 0
Queued Packets: 0
====================================================
I hope this is helpful. I'm about to take the exam.
Regards.
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