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VTP Questions

November 15th, 2018 Go to comments

Note: If you are not sure about VLAN Trunking Protocol, please read our VLAN Trunking Protocol VTP Tutorial.

Question 1


With VTP, switches can learn VLAN configuration of other switches dynamically.

Question 2


VLAN Trunking Protocol (VTP) allows a network manager to configure a switch so that it will propagate VLAN configurations to other switches in the network automatically.

Question 3


Only VTP Client cannot make a change to VLAN.

Question 4


The Dynamic Trunking Protocol (DTP) is a proprietary networking protocol developed by Cisco for the purpose of negotiating trunking on a link between two switches, and for negotiating the type of trunking encapsulation to be used.

In dynamic auto mode, the interface is able to convert the link to a trunk link. The interface becomes a trunk interface if the neighboring interface is set to trunk or desirable mode. The default switchport mode for newer Cisco switch Ethernet interfaces is dynamic auto. Note that if two Cisco switches are left to the common default setting of auto, a trunk will never form.

In dynamic desirable mode, the interface actively attempt to convert the link to a trunk link. The interface becomes a trunk interface if the neighboring interface is set to trunk, desirable, or auto mode. This is the default switchport mode on older switches, such as the Catalyst 2950 and 3550 Series switches -> This is the best answer in this question.

Reference: http://www.ciscopress.com/articles/article.asp?p=2181837&seqNum=8

Note: In this question answer “Trunk” is also correct. Maybe this is an error question. But Cisco requires us to pick up the best answer even such an error occurs so we believe “Dynamic desirable” is the best option here.

Question 5


In Cisco switches there are two encapsulations: 802.1q and ISL so we can set two ends to ISL instead -> A is not correct.

The ports between two switches must be set to trunk ports so that they can exchange VLAN information through VTP -> C is not correct.

To connect two switches we can use cross-over cable or straight-through cable (because modern Cisco switches can “auto-sense”) but not rollover cable -> E is not correct.

To forward traffic in the same VLAN (between two or more switches) we can use switches only. If we want to forward VTP traffic between different VLANs we can use either a router or a Layer 3 switch -> F is not correct.

Two switches can only communicate when they are set to the same VTP domain name (and the same VTP password) -> B is correct.

One of the two switches must be set to VTP Server so that it can create VTP updates and advertise its VLAN information.

Question 6


VTP server usually has the same revision number with other switches (when they are synchronized) so answer C is not correct. To run VTP, the VTP domain names and VTP version must be matched among the devices running VTP.

Comments (34) Comments
  1. xquenda
    April 18th, 2017

    Q2. Which protocol supports sharing the VLAN configuration between two or more switches?
    A. multicast
    B. STP
    C. VTP
    D. split-horizon
    Answer: C

  2. KACS
    April 27th, 2017

    Which protocol supports sharing the VLAN configuration between two or more switches?
    Answer: VTP

  3. michy
    May 6th, 2017

    What are the requirements for running VTP (choose two)
    A. VTP domain names must be different
    B. VTP domain names must be the same
    C. VTP server must have the highest revision numbers
    D. All devices need to have the same VTP version

  4. micho
    May 11th, 2017

    are there 3 possible answers here to the VTP question?
    B, C, D ?

  5. Vin
    June 20th, 2017

    As per link, if both neighboring port modes are Dynamic Auto then it will be Access. So how can Dynamic Auto is the correct answer for Question 4? The question is asking to create a trunk link.

    Please help!!! This question is repeated…so it is important..

  6. Leet
    June 22nd, 2017

    Question 4. WTF is desirable auto mode ? It’s either (Dynamic) Desirable or (Dynamic) Auto…

  7. Leet
    June 22nd, 2017

    @Vin, the question probably meant “trunk mode, or desirable” mode…

  8. Jim
    June 25th, 2017

    Question 4- Part1
    -First- There is no desirable auto mode. the question should say dynamic desirable
    -Second- The question only refer to trunk or dynamic desirable mode on the neighboring interface?

  9. Jim
    June 25th, 2017

    Question 4- Part2
    -Third:Refer to the DTP Negotiated Interface Modes table in the link below:

    Which DTP switch port mode allows the port to create a trunk link if the neighboring port is in trunk mode (row 4 , column 1), or dynamic desirable (row 3 , column 1)?

  10. Jim
    June 25th, 2017

    Question 4- Part3
    From the table : The switch port modes for the neighboring interface are located on the left side of the table (Column 1), and the switch port modes for the local interface are on the top of the table (Row 1). So, the neighboring ports in trunk mode (row 4 , column 1), or dynamic desirable (row 3 , column 1) allow to create a trunk link (cells 3,2 and 4,2), when the local interface is in Dynamic auto mode (row 1, column 2). this is the answer.

    Question 4- Part4
    if the question would said …. trunk mode, or dynamic desirable, or dynamic auto ? then the answer is C. Dynamic desirable

  11. tom
    July 6th, 2017

    Question 4 isn’t such a good question because there are two possibilities of the question here which each turn out having multiple correct answers. Since we know “desirable auto” does not exist, the question could have either meant to ask “dynamic auto” or “dynamic desirable”.

    If the question meant ‘dynamic auto’, the answer could either be ‘B. trunk’ or ‘C. dynamic desirable’, since
    trunk + trunk = trunk
    trunk + desirable = trunk
    auto + trunk = trunk
    auto + desirable = trunk

    If the question meant ‘dynamic desirable’, then A, B or C can be completely right since
    trunk + auto = trunk
    trunk + trunk = trunk
    trunk + desirable = trunk
    desirable + auto = trunk
    desirable + trunk = trunk
    desirable + desirable = trunk

    My advice is don’t try to memorize any answer here , just learn which combinations make what and you will be fine.

  12. hieu
    August 13th, 2017

    how can i get the question file guys, im starting learning CCNA, plz help me !!

    August 28th, 2017

    hi Tom,

    Thanks for your explanation nice one. I would like to add that the default behaviour is auto auto which may not be able to form the trunk , so to create a trunk manual intervention would be needed.



  14. dorel
    October 12th, 2017

    QUESTION 26 ?
    Which two statements about VTP are true? (Choose two.)
    A. All switches must be configured with the same VTP domain name
    B. All switches must be configured to perform trunk negotiation.
    C. All switches must be configured with a unique VTP domain name
    D. The VTP server must have the highest revision number in the domain
    E. All switches must use the same VTP version.
    What correct answer?
    A D ???

  15. chethiya
    November 21st, 2017

    #dorel yes!! A,D are correct

  16. noney12
    January 5th, 2018

    Q4 is wrong. auto + auto will not negotiate a trunk. the answer is dynamic desirable

  17. anonymous10928
    January 10th, 2018

    Question 6

    What are the requirements for running VTP? (Choose two)
    The icnd2 book explicity states the versions do not need to match. Requirements are:
    link between switches must be a vlan trunk (isl/802.1q)
    both switches case-sensitive domains must match
    if configured on at least one switch, both switches case sensitive password must match

  18. Anonymous
    February 1st, 2018

    @dorel- A and E will becorrect. In vtp version 2 is not compatible with version 1 so it will discard uupdates from version 1 if it itself jas version2 running on it. So version for both devices should be same, either version 1 on both or version2 on both

  19. Izzet Can
    February 26th, 2018

    Question 6 is wrong it should be B and C VTP version can be different check the link from cisco below. Revison number can be lower but it can cause problems so answer is BC brother.

    All switches in a VTP domain must have the same domain name, but they do not need to run the same VTP version.


  20. waspenterprise
    March 19th, 2018

    @Izzet Can on the link that you have provided there is a Caution sign and it says “VTP version 1 and VTP version 2 are not interoperable on switches in the same VTP domain. Do not enable VTP version 2 unless every switch in the VTP domain supports version 2.” (c) Cisco. So for running VTP, they must have the same VTP domain and same VTP version.

  21. meed
    March 26th, 2018

    q6/ All switches in a VTP domain must have the same domain name, but they do not need to run the same VTP version/////
    All switches in a VTP domain must have the same domain name, but they do not need to run the same VTP version///
    Before adding a VTP client switch to a VTP domain, always verify that its VTP configuration revision number is lower than the configuration revision number of the other switches in the VTP domain. Switches in a VTP domain always use the VLAN configuration of the switch with the highest VTP configuration revision number. If you add a switch that has a revision number higher than the revision number in the VTP domain, it can erase all VLAN information from the VTP server and VTP domain//
    so b and c is correct answer

  22. Gregory
    May 16th, 2018


    The one difference between VTP versions 1 and 2 that might matter has to do with the
    behavior of a VTP transparent mode switch. By design, VTP transparent mode is meant to
    allow a switch to be configured to not synchronize with other switches, but to also pass the
    VTP messages to VTP servers and clients. That is, the transparent mode switch is transparent
    to the intended purpose of VTP: servers and clients synchronizing.
    One of the requirements
    for transparent mode switches to forward the VTP messages sent by servers and clients is
    that the VTP versions must match. (official book)

    Thus, even if it is not a “technical requirement”, if versions are different and there are switches in transparent mode (apart from client and server) in your topology, difference in versions will mess up everything as VTP updates will not pass through…

    I would go for the answers that 9TUT gives but not 100% sure..

  23. Sinix
    June 23rd, 2018

    Which DTP switch port mode allows the port to create a trunk link if the neighboring port is in trunk mode, or desirable auto mode?
    A. Dynamic auto
    B. Trunk
    C. Dynamic desirable – Correct answer.
    D. Access

    9tut, please fix this, answer A is incorrect.

  24. Anonymous
    August 3rd, 2018

    Why I can not see the questions after red marking Question 1, 2 and so on???

  25. hi
    August 4th, 2018

    i guess because is too obvious?

  26. Anonymous
    August 7th, 2018

    What do you mean two obvious?

  27. waspenterprise
    August 9th, 2018

    I passed the exam. I only looked at the contents of it. Most of the questions are in it. It is worthy of trust.

    htt p://t.cn/ RDf8DJW

  28. venki
    September 28th, 2018

    you can get question from www(dot) 9tut(dot)com/ccna-questions-and-answers

  29. moin
    September 29th, 2018

    However, a switch can make some adjustments to be more compatible with neighbors
    using different VTP versions. For example, a switch running VTPv1 will attempt to
    change to VTPv2 if it hears a switch running Version 2 or 3 in the domain and it is capable
    of running Version 2. A switch running VTPv3 will begin sending scaled-down advertisements
    if it hears a VTPv1 switch. One exception is if extended range VLANs (1006 to
    4094) are in use; the extended range is supported only on switches capable of VTPv3.

    – CCNP Routing and Switching SWITCH 300-115 Official Cert Guide

  30. moin
    October 16th, 2018

    My statement above is wrong.

    “If there is a version 1-only switch, it does not exchange VTP information with switches that have version 2 enabled.”


  31. bill
    May 9th, 2019

    question came up in icnd2 exam,

    if both end of links are set to dynamic auto, what will happen?

    will form trunk
    not form trunk
    be access port

  32. Yachiyo
    June 29th, 2019


    Nothing will be formed because if both ends are set to dynamic auto, they are both waiting for negotiations.

  33. Mahbuub
    November 13th, 2019

    For questions file ping me.. Ican send it on your email,

  34. Arvin
    November 14th, 2019

    PLS, let me me know , why I can not see question, I can see just answer, where are the questions ?

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