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ICND2 – DTP Questions

March 23rd, 2017 in ICND2 200-105 Go to comments

Question 1

Explanation

Control traffic like CDP, DTP, PAgP, and VTP uses VLAN 1 to operate, even if you change the native VLAN.

Question 2

Explanation

Although some books and websites said DTP is disabled if the switch port is configured as trunk or access mode (via the command “switchport mode trunk” or “switchport mode access”) but in fact DTP is still running in these modes. Please read at http://packetlife.net/blog/2008/sep/30/disabling-dynamic-trunking-protocol-dtp/. The only way to disable DTP on a switch port is to use the “switchport nonegotiate” command. But notice this command can only be used after configuring that switch port in “trunk” or “access” mode.

Therefore this is a question with no correct answer but if we have to choose an answer, we will choose answer A. At least it is correct in theory.

Question 3

Question 4

Explanation

The Dynamic Trunking Protocol (DTP) is used to negotiate forming a trunk between two Cisco devices.  The default DTP configuration for Cisco Catalyst 2960 and 3560 switches is dynamic auto.

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

Comments (11) Comments
  1. so??
    April 18th, 2017

    Is the answer to question 2
    trunk or access?
    (i am not able to see the questions currently)

  2. Anonymous
    June 7th, 2017

    in regards to Q 1, I thought CDP, DTP traveled on the native VLAN.
    Because if ‘Control traffic like CDP, DTP, PAgP, and VTP uses VLAN 1 to operate, even if you change the native VLAN.’ is true. When you shut VLAN 1 would you no longer see CDP neigh??

  3. Anonymous
    June 14th, 2017

    So Maria,

    Were the 9tut dumps any use to you?

  4. Pete
    June 18th, 2017

    Is question 1 not Native Vlan??

  5. @Anonymous
    July 2nd, 2017

    you can’t shutdown vlan 1 or suspend

  6. Joe
    July 8th, 2017

    But you can prune vlan 1 from a trunk; in which case I’m pretty sure cdp still works. I’ll have to research.

  7. no
    July 29th, 2017

    No, only VLAN0001 for control traffic, no matter what you do, including pruning with VTP, according to this at least:

    https://supportforums.cisco.com/discussion/10790041/shutting-down-vlan1-security-switchport-trunk-native

  8. KR
    August 9th, 2017

    For question 4, option D (Dynamic Auto) is correct for Catalyst 2960 and 3560 but option C (Dynamic desirable) is correct for older Catalyst 2950 and 3550 switches as stated in the link provided under question 4 explanation. The question states “Whats DTP’s default in a switch?”. How can option D be correct when we dont know which series switch it is?

  9. Almost there :)
    August 9th, 2017

    Anyone done the exam lately?
    I have mine next friday

  10. ICND2
    August 9th, 2017

    Hi,
    for question 2 I have found this
    https://supportforums.cisco.com/discussion/12915416/change-dynamic-auto-access-mode-will-disable-dtp-effectively

    my understanding is that the correct answer is D.

    If configured as trunk you need also the command switchport nonegotiate. Any thought on this?

  11. kksmh
    August 17th, 2017

    I had question 4 modified today on icnd2 the choices were:
    What is DTP’s default in a switch?
    A. ON
    B. OFF
    C. Desirable
    D. Auto

    Is it Auto or ON?