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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
  1. 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.

  2. Anonymous brother
    January 22nd, 2020


  3. eleazar
    February 8th, 2020

    11 , I´m sure that if there is a layer 2 SW, SVI is for remote administration

  4. poulpos
    February 8th, 2020

    “By default, an SVI is created for the default VLAN (VLAN1) to permit remote switch administration. ” So answer B may be OK.

    “Provide Layer 3 IP connectivity to the switch.” So answer D is possible too.

    “An SVI can also be known as a Routed VLAN Interface (RVI) by some vendors.” Finaly answer C is surely the official one.

    Source : https://en.wikipedia.org/wiki/Switch_virtual_interface

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