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Trunking Questions 2

November 18th, 2018 Go to comments

Question 1


If one end is set to “Trunk” and the other is set to “Dynamic auto” mode then the trunk is not created so answer D is not correct.

Question 2

Question 3

Question 4


From the “show mac address-table” output, we see FastEthernet0/1 can receive traffic from multiple VLANs -> it is configured as a trunk. Also from the “show cdp neighbors” output, we see Fa0/1 of this switch is connecting to Switch2 so it is configured as a trunk.

There are two MAC addresses learned from FastEthernet0/5 while FastEthernet0/5 is not configured as trunk (only Fa0/2 & Fa0/3 are configured as trunk links) -> a hub is used on this port.

Question 5


Dynamic Trunking Protocol (DTP) is a Cisco proprietary protocol for negotiating trunking on a link between two devices and for negotiating the type of trunking encapsulation (802.1Q) to be used.

Question 6

Question 7

Comments (25) Comments
  1. Stark
    November 28th, 2017

    where can i find questions for these?

  2. Captain Deadpool
    January 3rd, 2018

    in 9tuts CCNA FAQs & Tips section

  3. noney12
    January 5th, 2018

    Q1 – dynamic desirable is the only DTP mode listed that will connect to dynamic auto

    Q2 – native vlans are untagged on trunk ports

    Q3 – vtp is not configured so A will not work — B is the only other correct answer

  4. Roman
    January 13th, 2018

    @noney12, but how bout trunk+desirable auto?
    It’s a trunk too.

  5. shruti
    January 30th, 2018

    Q1 Which DTP switchport mode allow the port to create a trunk port if the the port is in trunk, dynamic auto and dynamic desirable mode?
    A. Dynamic Auto
    B. Dynamic Desirable
    C. Access
    D. Trunk

    why just B? Ans should be B and D both.


  6. Question 5
    February 1st, 2018

    @ Shruti- Answer B is correct only as it works for layer 2 and layer 3 switches by default if you use this command “Switchport mode dynamic desirable”.

    If you use “”switchport mode trunk” directly in a Layer 3 switches it when the other end is configured to trunk mode on an L2 switch it will throw an error. To remove that error you will need to to first configure Ëncapsulation dot1q” sinec it supports ISL and dot1q encapsulation and three negotiation modes to form the trunk links which are “” ISL, TRUNK and ON” and then you can use switchport mode trunk command . By default on L3 switches negotiation mode will be ON mode . so for taht yu need to change the encapsulation to dot1q first .So when an L2 switch is connected to L3 switch the most appropriate answer would be B. dynamic desirable

  7. HRR
    February 17th, 2018

    I’m agree with @shruti, Ans shoudl be B and D both

    Following table summarizes different combinations of switch port modes.

    Switchport Mode——dynamic desirable—–dynamic auto—-trunk——access
    dynamic desirable—–trunk——————-trunk————-trunk——access
    dynamic auto———-trunk——————-access————trunk——access

  8. max
    March 27th, 2018

    please send me the latest dumps
    max.sarmd (at ) gmail (dot) com

  9. Kitt
    July 1st, 2018

    question 3 a n b are the same ??? sb help spot the difference

  10. kitt
    July 1st, 2018

    b n d sorry

  11. NANA
    August 9th, 2018

    http :/ /t.cn/RDf8DJW
    Share a useful link, the content inside is true and effective.

  12. Michael
    August 24th, 2018

    Q3 by default 2950/3550 has “dynamic desirable”, while 2960/3650 has “dynamic auto”
    It’s another stupid question from Cisco. No information about dtp mode.

  13. ItsShowtime
    October 7th, 2018

    There is a Fault in the explanation of the first question!
    Trunk + Auto forms a Trunk link, Auto + Auto not.

  14. Kenn
    October 17th, 2018

    For question 1.
    If one side is trunk another side is Dynamic auto the link will become Trunk.
    Because Trunk link sends DTP to remote switch to get a trunk link. So the answer D is absolutely true. B is also true

  15. Q4
    November 2nd, 2018

    why F. A hub is connected directly to FastEthernet0/5 ??? CDP tells us is CISCO 2950 switch so thats not hub
    In the same Question in explanation “FastEthernet0/5 is not configured as trunk… ” I don’t see show interfaces trunk command in the Exhibit, so from what this statement ?

  16. Q4
    November 2nd, 2018

    and Hub not uses VLAN 2

  17. zamil
    November 4th, 2018


    ative VLAN frames are carried over the trunk link untagged -> A is correct.

    802.1Q trunking ports carry all the traffic of all VLANs so it cannot be the secure ports. A secure port should be only configured to connect with terminal devices (hosts, printers, servers…) -> B is not correct.

    The Inter-Switch Link (ISL) encapsulation requires FastEthernet or greater to operate but 802.1q supports 10Mb/s Ethernet interfaces. -> C is correct.

    802.1Q supports point-to-multipoint connectivity. Although in Cisco implementation, a “trunk” is considered a point-to-point link but 802.1q encapsulation can be used on an Ethernet segment shared by more than two devices. Such a configuration is seldom needed but is still possible with the disablement of DTP negotiation. -> D is not correct (Reference: http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a008012ecf3.shtml)

    The native VLAN that is configured on each end of an 802.1Q trunk must be the same. This is because when a switch receives an untagged frame, it will assign that frame to the native VLAN. If one end is configured VLAN1 as the native VLAN while the other end is configured VLAN2 as the native VLAN, a frame sent in VLAN1 on one side will be received on VLAN2 on the other side -> E is correct.

  18. MJ
    November 8th, 2018

    @ Q4
    A. Interface FastEthernet0/2 has been disabled.
    B. Multiple devices are connected directly to FastEthernet0/1.
    C. FastEthernet0/1 is configured as a trunk link.
    D. FastEthernet0/1 is connected to a host with multiple network interface cards E. FastEthernet0/5 has statically assigned MAC addresses.
    F. A hub is connected directly to FastEthernet0/5

    The best way to answer this question is through eliminations:
    C & F are correct

  19. Sovandara
    November 13th, 2018

    Q1, “If one end is set to “Trunk” and the other is set to “Dynamic auto” mode then the trunk is not created so answer D is not correct.” , i think it is not correct. the result of Trunk and Dynamic auto is should be Trunk.

  20. Q4
    November 27th, 2018


    C. there is some vlans learned by the F0/1 so it oviusly is a trunk port.
    F. If we can see in the exhibit cdp is unable to detect a Hub connection and there area two mac address learned by the same interface f0/5 it mean its a hub.

  21. Alvine
    March 20th, 2019


  22. bill
    April 30th, 2019

    had exam. question came up:

    if both end of trunk ports are set as Dynamic Auto, what will happen?

    – trunks will fail to initiate
    – trunks will form immediately
    -become access port

    i chose trunks will fail to initiate. but i think real answer is they become access port. any ideas?

  23. Amine
    April 30th, 2019

    if both end of trunk ports are set as Dynamic Auto, what will happen?

    – trunks will fail to initiate
    – trunks will form immediately
    -become access port

    ANswer:become access port

  24. Eric
    May 7th, 2019

    @9tut Q4.The exhibit is not enough to determine that interface fa0/5 is not configured as trunk.

  25. Q4
    November 25th, 2019

    The explanation on this answer confused me. (only Fa0/2 & Fa0/3 are configured as trunk links) I don’t see where Fa0/3 is trunked?

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