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InterVLAN Routing

November 11th, 2018 Go to comments

Note: If you are not sure about InterVLAN, please read our InterVLAN Routing Tutorial.

Question 1

Question 2

Question 3


To enabe encapsulation on a subinterface we have type the “encapsulation” command under that subinterface, not the main interface. An example of configuring encapsulation on subinterface of Fa0/1 is shown below:

Router(config)#interface f0/0
Router(config-if)#no shutdown

(Note: The main interface f0/0 doesn’t need an IP address but it must be turned on)

Router(config)#interface f0/0.0
Router(config-subif)#encapsulation dot1q 10
Router(config-subif)#ip address
Router(config-subif)#interface f0/0.1
Router(config-subif)#encapsulation dot1q 20
Router(config-subif)#ip address

Note: In the “encapsulation dot1q 10”, number 10 is the VLAN applied to that subinterface. Or you can understand that the subinterface belongs to that VLAN.

Question 4


The causes of slow interVLAN are usually duplex mismatch or collision domain issues, user misconfiguration. For more information please read: http://www.cisco.com/c/en/us/support/docs/lan-switching/virtual-lans-vlan-trunking-protocol-vlans-vtp/23637-slow-int-vlan-connect.html#troubleshoot_slow_interv

Question 5

Question 6

Question 7

Question 8


This question only asks about enable router-on-stick on a switch, not a router. We don’t have subinterface on a switch so B is not a correct answer.

Question 9

Question 10

Question 11

Question 12

Comments (4) Comments
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  1. CCNA.AM
    October 5th, 2019

    Why i can’t see the questions. i can see only 3 explanations but none of the questions

  2. jh
    November 13th, 2019

    Surely q11 is D

  3. jh
    November 13th, 2019

    wondered why there werent comments on q11. only then did i see this was page 2 and was missing the jamboree on page 1. still think its D.!

  4. Krelli
    January 17th, 2020

    Question 4 is wrong, should be

    C. Slow interVLAN connectivity (slow forwarding between VLANs) occurs when there is no slowness on the local VLAN, but traffic needs to be forwarded to an alternate VLAN, and it is not forwarded at the expected rate.

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