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DHCP Sim

December 26th, 2016 in LabSim Go to comments

Refer to the topology below and answer the questions.

Topology.jpg

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
 

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.

R3_show_run.jpg

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.

R3_show_ip_int_brief.jpg

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.

R1_R2_show_ip_int_brief.jpg

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.

R2_show_run_ntp_part.jpg

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:

R1_ping_Server1.jpg

The ping worked well so maybe R1 is good so we should check R2 first. We notice on R2 there is an access-list:

R2_show_run_access_list_part.jpg

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:

R1_show_run_nat_interfaces.jpg

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.

Comments (20) Comments
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  2. Jer
    January 3rd, 2017

    This Simulation is one of the ones i had on my test on December 15th. Thank you for this.

  3. Lazuli
    January 3rd, 2017

    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

  4. schustah
    January 10th, 2017

    thx

  5. CC
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    This was the first question verbatim that was one my test Jan 10 2017

  6. MikeJS
    January 14th, 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

  7. For Mike
    January 17th, 2017

    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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  15. 2nd chance
    March 2nd, 2017

    this was on my icnd1 exam last week 🙂 but with different configuration so different correct answers

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    Hi everyone! Does ICND1 have to do any configurations? or is everything just show commands?

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