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DHCP Sim

October 16th, 2016 Go to comments

Refer to the topology below and answer the questions.

Topology.jpg

You can download this lab and practice with Packet Tracer at http://www.9tut.com/download/9tut.com_DHCP_Sim.zip (note: In this Packet Tracer file we use FastEthernet instead of Ethernet connections; and interfaces Fa1/0, Fa1/1 instead of interfaces Et0/2, Et0/3)

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 (25) Comments
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  1. Anonymous
    March 2nd, 2017

    Hi Every One I passed CCNA exam (200-125) today. 181 VCE multiple and Lab 4(OSPF,ACL,DHCP, RIV 2 ) is still valid. I got 910 marks .

  2. nomi
    March 5th, 2017

    Dear all i need to know like here dhcp sim we just need to answer the questions? or we will change the configuration in exam LAB?

  3. mohammed
    March 6th, 2017

    There is no configuration changes in the exam all you need to do is answer the question using sh running-config, show ip interface brief.

  4. Sharpy
    March 7th, 2017

    Wag 1

  5. Shadow
    March 7th, 2017

    Anyone pass 200-125 today to verify if the 182q dump is still valid??

  6. jmachado
    March 9th, 2017

    @nomi

    At the moment, current reports from my students is that the questions are the same. However, it is common practice for Cisco to adjust the configuration settings on the same to change the right answer. Therefore, I strongly recommend to not only find and study the right answer, but to understand the wrong answers as well. Look at the possibilities in which the configuration could be modified because you will never know.

  7. Pass
    March 10th, 2017

    @shadow
    Ipassed ccna 200-125 yasterday and 182q dump is still valid

  8. Ashy
    March 13th, 2017

    Respected 9tut
    Please set DHCP configuration on R2 … it has not been configured on your lab file

    Router2(config)#ip dhcp exclude-address 192.168.20.1
    ip dhcp pool R3 192.168.20.0 255.255.255.252
    default-router 192.168.20.1
    do copy r s

    Best regards

  9. Ashy
    March 13th, 2017

    Router2(config)#ip dhcp exclude-address 192.168.20.1
    ip dhcp pool R3
    network 192.168.20.0 255.255.255.252
    default-router 192.168.20.1
    do copy r s

  10. Ashy
    March 13th, 2017

    As our network has been configured with RIP then it is necessary to configure default-static rout on rip mode , then ” default-information originate ” command should be applied otherwise no device except of R1 can ping ISP router interface with 209.165.200.226

    R1(config)router rip
    default-information originate

  11. rastaguru1
    March 15th, 2017

    Hi everyone I passed my exam on Monday 13th…182q still valid..thanks to you all and 100% appreciation to God and 9tut.

  12. GTAV
    March 15th, 2017

    Hey guys what is the 182q dump and where can I get it? can anyone reply please, thank you

  13. Anon
    March 16th, 2017

    Hi Every One I passed CCNA exam (200-125) today March 16th. 182 VCE multiple and Lab Sims (OSPF,ACL,DHCP, RIV 2 ) still valid.

  14. salim
    March 19th, 2017

    Do we need to study all quizez or just the sim lab and 191?

  15. Anonymous
    March 20th, 2017

    Hey, someone could send me the 182q ?

  16. Leonardo
    March 20th, 2017

    Hey, someone could send me the 182q ? {email not allowed}

  17. Leonardo
    March 20th, 2017

    Hey, someone could send me the 182q ? leonardomou gmail

  18. adela
    March 20th, 2017

    I think packet tracer is not configured properly. Question 2, when I type ‘show running-cofig’ I dont see any ntp listed

  19. skyflakes
    March 21st, 2017

    What is the two benefits of DHCP snooping? (choose two)
    A. Static reservation
    B. DHCP reservation
    C. Prevent DHCP rouge server
    D. Prevent untrusted host and servers to connect

  20. jackson
    March 21st, 2017

    C and D for the two benefits of DHCP snooping.

  21. Tech
    March 21st, 2017

    Please guyz can anyone tell me when the 100-125 dump expires

  22. Sam
    March 22nd, 2017

    plz send latest dumps ASAP

  23. Aman
    March 22nd, 2017

    Can someonee help me.

    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 above is D. but in my dumbs is B. please

  24. Anonymous
    March 22nd, 2017

    Answer is D.

  25. Anonymous
    March 23rd, 2017

    in mu Dumps its :
    D. The IP address that is used in the NTP configuration on R2 router is incorrect.

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