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Trunking Questions 2

November 18th, 2017 Go to comments

Question 1

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 (7) 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

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