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VLAN Questions

November 19th, 2018 Go to comments

Note: If you are not sure about Virtual Local Area Network (VLAN), please read our Virtual Local Area Network VLAN Tutorial.

Question 1

Question 2

Question 3

Question 4

Question 5

Explanation

On an Ethernet connection, a duplex mismatch is a condition where two connected devices operate in different duplex modes, that is, one operates in half duplex while the other one operates in full duplex. Duplex mismatch can easily cause collision domain issue as the device that operates in full duplex mode turns off CSMA/CD. So it is eager to send data immediately without checking if the link is free to use -> A is correct.

An “inband path” is the path which provides path for management traffic (like CDP, VTP, PAgP…) but we are not sure why congestion on the switch inband path can cause collision domain issues. Maybe congestion on inband path prevents the JAM signal (sent when a collision occurs on the link) to be sent correctly on the link.

Question 6

Explanation

If we configure an access port as follows:

Switch(config)#interface fa0/1
Switch(config-if)#switchport mode access

Then this interface, by default, will belong to VLAN 1. Of course we can assign another VLAN to this port via the “switchport access vlan {vlan-number}” command.

Question 7

Explanation

Traffic on the native VLAN is untagged -> Answer B is not correct.

Control plane traffic (like CDP, VTP, STP…) runs on VLAN 1 by default. They are not blocked on the native VLAN -> Answer C is not correct.

If the answer says “the native VLAN should be set so that no real traffic running on it for security reasons” then it is correct but the native VLAN is not typically disabled -> Answer D is not correct.

CDP runs on VLAN 1 by default and the native VLAN is also VLAN 1 by default so answer A is the best choice here.

Question 8

Explanation

With the configuration above, when we type “do show vlan” we would not see VLAN 10 in the VLAN database because it has not been created yet. VLAN 10 is only created when we exits VLAN configuration mode (with “exit” command).

Question 9

Explanation

IEEE 802.1Q is the networking standard that supports virtual LANs (VLANs) on an Ethernet network. When a frame enters the VLAN-aware portion of the network (a trunk link, for example), a VLAN ID tag is added to represent the VLAN membership of that frame. The picture below shows how VLAN tag is added and removed while going through the network.

VLAN_tag_added_removed.jpg

Question 10

Explanation

When using VLAN the number and size of collision domains remain the same -> A is not correct.

VLANs allow to group users by function, not by location or geography -> B is correct.

VLANs help minimize the incorrect configuration of VLANs so it enhances the security of the network -> C is correct.

VLAN increases the size of broadcast domains but does not decrease the number of collision domains -> D is not correct.

VLANs increase the number of broadcast domains while decreasing the size of the broadcast domains which increase the utilization of the links. It is also a big advantage of VLAN -> E is correct.

VLANs are useful but they are more complex and need more administration -> F is not correct.

Comments (15) Comments
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  1. B
    June 1st, 2018

    9tut, you should allow Comments under each question (so users would be able to discuss) and hide the answers, explanations and comments by default.

  2. Ow_youtube
    June 22nd, 2018

    About VLAN, there is a nice video on youtube..enjoy
    https://www.youtube.com/watch?v=z9OIGwzgs54&t=78s

  3. Mo”
    June 25th, 2018

    Hi

    Can anyone tell me , why I am not seeing questions and answers but just seeing only explanations

    Thanks.

  4. blabla
    July 27th, 2018

    I think question 8 is wrong. If you type (config)#vlan 10, vlan is already created. I do not have real switch to check this but im almost sure i saw topic about that in cisco book.
    In packet tracer it works as i said.

  5. NAN
    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.

    http: / / t.cn/RDf8DJW

  6. Anand
    August 29th, 2018

    These are the answers. where are the questions ?

  7. jay
    September 22nd, 2018

    guys how can i see the answers without questions??? how ???

  8. venki
    September 26th, 2018

    For question 5 packet tracer adds vlan 20 as soon as when u enter VLAN 20 command…but in a real router it doesn’t work… vlan added only when u exit from VLAN config mode …try it on GNS3…

  9. hoi
    September 28th, 2018

    Q5 Answer D is not correct. There are no collisions on a failing NIC.

  10. Baker
    November 3rd, 2018

    Where are the questions????

  11. zamil
    November 3rd, 2018

    Q 2

    Switch#sh vlan id 20

    VLAN Name Status Ports
    —- ——————————– ——— ——————————-
    20 VLAN0020 active Fa0/2, Fa0/8, Fa0/10, Fa0/13
    Fa0/14

  12. rian
    November 9th, 2018

    anyone can help me the purpose of NAtive VLAN?…purpose of etherchannel?
    please need your idea as soon as possiblle..Thanks advance

  13. Amir
    November 26th, 2018

    #9tut Staff
    Hey guys!
    This is the second time I’m encountering with a bug on your quizzes interface,
    Please pay attention to this problem, the correct answers are not always displayed correctly.
    Here’s an example showing the review portion of the quiz, I chose the correct answer and it still shows a different correct answer with the content:
    [IMG]http://i66.tinypic.com/fcmx44.jpg[/IMG]

  14. 9tut
    November 26th, 2018

    @Amir: Thanks for your information. We will try to fix the issue.

  15. william
    December 12th, 2018

    Can anyone share the latest CCNA dumps at bullscashonline18 att gmail dot com
    That would be really helpful!!!

    I am going to sit for exam in the last of this exam…
    i will be really thankful to guys,,,,,

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