Home > Ticket 13 – DHCP Helper-address

Ticket 13 – DHCP Helper-address

April 24th, 2018 in TSHOOT v2 Go to comments

Configuration on DSW1:

interface Vlan 10
 ip address
 ip helper-address

+ In this ticket you will find port-security configured on ASW1 but it is not the problem as the port-security is good (check with the “show interface fa1/0/1” command on ASW1 and you will see it is still in up/up state. Also if we use “ipconfig” command on Client1, we will see APIPA address (169.254.x.x).
+ is the loopback1 interface of R4. The wrong IP address of does not exist.

Ans1) DSW1
Ans2) IP DHCP Server (or DHCP)
Ans3) on DSW1 delete “ip helper-address” and apply “ip helper-address” command

Comments (30) Comments
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  1. Confused
    April 9th, 2011

    Nice! Thank you networktut!

  2. RIP
    April 9th, 2011

    Thanks …..
    finally its good to see that site is fully updated………………………….

  3. FBI
    April 9th, 2011

    am feeling u guyz…did my tshoot yesterday had 986!got the DHCP tt.

  4. FBI
    April 9th, 2011

    2morrow is my birthday so happy i made my tshoot.

  5. Shadow
    April 9th, 2011

    Any updates for the EIGRP passive interfaces TT?

    What’s will be the symptoms for that, what can be pinged and what cannot?


  6. RIP
    April 9th, 2011

    u can not pin R1,R2,R3,R4

  7. gell
    April 9th, 2011

    i passed this exame one week ago and i came across this ticket but luckily i spotted the issue .
    gd luck guys

  8. mp
    April 15th, 2011

    Is the faulty device R4 or DSW1; I believe the DHCP server will be configured on DSW1 not on router R4

  9. Anonymous
    April 16th, 2011

    The 642-832 TSHOOT Topology made available by cisco on the PDF is not the same as their online Topology demo. Could someone please confirm the actually topology used in the real exam?

  10. Mac
    April 22nd, 2011


    take a look at the topology again- it is clearly mentioned that DHCP server is R4. DSW1 is the default gateway for client, NOT DHCP server

  11. Anonymous
    April 22nd, 2011

    Can anybody give me an example of exactly how the TT Questions are asked i the exam?

  12. Sonic
    April 26th, 2011

    @Mac, I think ‘mp’ is right. DHCP server can not be on R4 because it has interface from another network Yes, on the topology is mentioned that DHCP server is R4, but the clients are from other broadcast domain. So, when DHCP client broadcasts DHCPDISCOVER message, it will be broadcasted only in (VLAN10) and will not reach to R4 at all. DHCP server has to be somewhere in the clients net There are two possibilities – on DSW1 or DSW2 (VLAN10).

    Can someone explain this please – Where is the mistake?!

  13. Sonic
    April 26th, 2011

    OK, I found it – it is possible DHCP Server to be from another network. In this case on R4. For this aim we have to use “ip helper-address” command on DSW1’s fa1/0/1 interface. Then all broadcast DHCP discover messages from the clients will be transformed to unicast and forwarded by DSW1 to (R4) :)

  14. mr.muschnik
    April 28th, 2011

    Almost… the ip helper-address command needs to be configured for Vlan10s SVI (interface Vlan10 that is) not fa1/0/1.

  15. Sonic
    April 29th, 2011

    @mr.muschnik right! :)

  16. lina
    April 29th, 2011

    so networktut is right

    April 30th, 2011

    Does the CCNP 642-832 TSHOOT exam ROUTERS and SWITCHES resets themselves, or do we have to logout of all DEVICES after each Trouble Ticket?

  18. Felcor
    May 5th, 2011

    Hello everybody, I did the test today with 930/1000 – there is a tt of bgp and drag drop a question that is not available on the site that went into my exam, the rest are equal.
    Thank you!

  19. DBW
    May 15th, 2011

    I have completed my CCNP certification today by passing my last exam TSHOOP.
    The exam itself was kind of straight forward with almost all of the TT well know
    as state on this site. I had 2 DD, 2 MCQ & 13 TT

    One of the issues with this TSHOOP exam is that you have to constantly move windows around whiles you are trying to keep your concentration. I was also working on small screen. (Frustrating)

    Have a strategy with your PING command
    Make sure you properly exit all devices after each ticket.
    Abort and move to the next TT if you can’t find the problem. (You can always come back)

    I think cisco should have offered a PRINT OUT OF THE TOPOLOGY to all candidates on exam day and collect them afterwards. Anyway! I have a good dump. Interested? Drop me a line donald.bart-williams@stjohns.surrey.sch.uk

    I am now going to be focus on ASA5510 firewall

    To all you CCNP Candidates on this forum including SWITCH & ROUTE, Good Luck and have a nice summer. It has been fun

  20. hima
    May 17th, 2011

    please i have exam in 22may please any exchange happened in tt & DD& CHOOSE please send me

  21. sam
    May 20th, 2011

    @hima no changes in exam, prepare well from networktut. all TT and Q from networktut

  22. Student
    May 22nd, 2011

    Do people have been using the ‘Abort strategy’ frequently? I have my exam tomorrow and i think its a great way to check our answers – whats your take on this?


  23. Duo
    June 3rd, 2011

    Damn~ I didn’t get this one.. but thanks networktut. I’ve the exam earlier,. 890pts.. ^__^

  24. Duo
    June 3rd, 2011

    Damn~ I didn’t get this one.. but thanks networktut. I’d my exam earlier,. 890pts.. ^__^

  25. Luigy
    July 1st, 2011

    I am thinking that we could also use the command “show ip dhcp binding” to check if any IP addresses were given out by the DHCP Server.

  26. su
    July 5th, 2011

    dear all i did the test today with 986/1000 the dhcp server is on the R4 router the networktut is right

  27. sos
    July 5th, 2011

    i am fail today in the exam because i didn’t find any question only only 3 question

  28. Marilu
    July 8th, 2011

    Finally! This is just what I was looinkg for.

  29. Fergy
    July 8th, 2011

    Please guys how can I know when to ping from Layer2 Topology or IPv4 Layer 3 Topology. Can there be a possibility for me to use only one Topology to solve the entire problems? Please help me, I need to know.!!!

  30. icecold
    July 8th, 2011

    passed TSHOOT this morning and I am a CCNP now

    next thing, being with my family as they have missed me so much

    good luck for everyone

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