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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://iae.ie/?certs=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 (19) Comments
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  1. Dumps
    September 11th, 2017

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    September 17th, 2017

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    September 17th, 2017

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    September 17th, 2017

    Please sent me the latest dumps for CCNA 200-125 to fergusor501*@*g*mail*com

  5. Bilal
    September 19th, 2017

    Interface IDS are not listed correctly in this lab zip file

  6. David
    September 20th, 2017

    I don’t see any DHCP config in R2…

  7. kaleem
    September 22nd, 2017

    plz send ccna dumps
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  8. Mr X
    September 26th, 2017

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    September 26th, 2017

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    September 27th, 2017

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  11. inthemoment
    September 29th, 2017

    hello can someone please send me the latest 200-125 dumps to forthedroid at gmail dot com.

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  12. MS
    October 2nd, 2017

    passed my exam last week got 9xx this Sim was one of my questions, 80 percent of the questions from this dumps. thanks 9tut

  13. Radutir
    October 8th, 2017

    9tut, at q3, pls change Server0 with Server0 and vice-versa acording .zip topo, for new lerners.

  14. Radutir
    October 8th, 2017

    Server0 with Server1 sorry

  15. moatasem
    October 10th, 2017

    @MS which dumps you read
    Can you send it for us plz

    moatasem82 at hotmail.com

  16. Mik
    October 13th, 2017

    @MS Which dump you used?

    can you send me on {email not allowed}.

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  17. Miki
    October 13th, 2017

    @MS Which dump you used?
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  18. Machoy
    October 16th, 2017

    Hi everyone,
    Please send me latest dumps for CCNA 200-125 on email: machoy1200-at-gmail-dot-com
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  19. zakrota
    October 17th, 2017

    there is no dhcp config on r2

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