How can you disable DTP on a switch port?

How can you disable DTP on a switch port?
A. Configure the switch port as a trunk.
B. Add an interface on the switch to a channel group.
C. Change the operational mode to static access.
D. Change the administrative mode to access.

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12 thoughts on “How can you disable DTP on a switch port?

  1. The DTP packets are not sent in these three circumstances:

    1.) Either the port is a static access port configured by the command switchport mode access

    2.) Or the port is a static trunk port configured with the command switchport mode trunk and at the same time, the DTP negotiation is deactivated using the command switchport nonegotiate

    3.) The port is a routed port configured with the command no switchport

    Here seems takes place, so liked by bad guys of cisco, playing by words in the question: C. Change the “operational” mode to static access. D. Change the “administrative” mode to access. I think these two words “operational” and “administrative” do not exactly match to the words mentioned in cisco explanation. So remains answer A , which itself is correct one. I mean matches every word.

  2. The answer is D. Enabling a trunk by itself does not disable DTP. The only way to effectively stop DTP on a trunk is either
    1. Configure the port as an access port
    2. Enable the nonegotiate on the trunk port as a second command.

  3. The answer is definitely D. There are two ways to disable DTP on a switchport. One is choice D and the other is with switchport nonegotiate, which isn’t an option here.

  4. I think the logic behind a is that if you do “switchport mode trunk” and set state to on, nothing negotiates a trunk with on… On/On equals trunk… On/Desirable or whatever means no trunk… Maybe I say, they got it like this. The question and its replies are still making me crazy… so bad…

  5. A. Configure the switch port as a trunk. is the correct answer.

    The operational mode will display DEPENDING on what’s connected. If a user device is connected, it will display STATIC ACCESS, if another SWITCH is connected, it will display TRUNK, if nothing’s connected it will display DOWN.
    You have to think about DTP connected SWITCH to SWITCH.

    Hope this help to clarify.

  6. The right answer has to be D.

    First what is DTP, as the name indicated, Dynamic Trunking Protocol, it automatically tries to form trunks with other devices, so to disable the ability to create trunks you must put it in access mode, therefore D is the correct answer.

  7. What about this from “CCNA Routing and Switching ICND2 200-105 Official Cert Guide” by WENDELL ODOM

    “Cisco recommends disabling trunk negotiation on most ports for better security. The majority of switch ports on most
    switches will be used to connect to users. As a matter of habit, you can disable DTP negotiations altogether using the switchport nonegotiate interface subcommand.”

  8. I think the right answer is A, because of simple gramatic of the other answer.
    A. Configure (put a command line) the switch port as a trunk.
    B. Add an interface on the switch to a channel group. (obiusly not)
    C. Change the operational (how you change operational mode, what means operational?) mode to static access.
    D. Change the administrative (how you change administrative mode, what you understand of this phrase?) mode to access.

    I think the right answer is A, because C and D not corresponse a good answer

  9. Right answer is D. A could be right, if you also use another command after change to the trunk mode – nonegotiate.

    1. D is right:
      Look: Default configuration:
      Switch#show interfaces fastEthernet 0/1 switchport
      Name: Fa0/1
      Switchport: Enabled
      Administrative Mode: dynamic auto
      Operational Mode: down
      Administrative Trunking Encapsulation:
      Operational Trunking Encapsulation: native
      Negotiation of Trunking: On

      Now I will change to trunk (like in answer A):
      Switch(config)#interface fastEthernet 0/1
      Switch(config-if)#switchport mode trunk
      And check:
      Switch#show interfaces fastEthernet 0/1 switchport
      Name: Fa0/1
      Switchport: Enabled
      Administrative Mode: trunk
      Operational Mode: down
      Administrative Trunking Encapsulation:
      Operational Trunking Encapsulation: dot1q
      Negotiation of Trunking: On ———————— IT IS STILL ON!

      When I will configure ACCESS:
      Switch(config)#interface fastEthernet 0/1
      Switch(config-if)#switchport mode acces
      And check:
      Switch#show interfaces fastEthernet 0/1 switchport
      Name: Fa0/1
      Switchport: Enabled
      Administrative Mode: static access
      Operational Mode: down
      Administrative Trunking Encapsulation:
      Operational Trunking Encapsulation: native
      Negotiation of Trunking: Off ———————– IT IS OFF – D. Is Right

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