active vlan

Answered Question
Jul 8th, 2009
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Hi every body!

Here is my book question:

q) A switch has just arrived from cisco. The switch has never been configured with any vlans,vtp configuration,or any other configuration.An engineer gets into configuration mode and issues the vlan22 command,followed by the name Hannahs-vlan command. which of the following are true?

a) Vlan 22 is listed in the output of show vlan brief command.

b) vlan 22 does not exist inthat switch until atleast one interface is assigned to that vlan.

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From my earlier posts on net pro, I learned that a vlan is regareded as active if atleast one port is assigned to it or the switch has trunk which carries that vlan.


I chose the option "B" while the book shows the correct answer is " a"


My question is it is posssible for a vlan to exist but not active on the switch i.e there is no port assigned to it and there is no trunk on the switch that carries that vlan .

Thanks a lot and have a nice day!














Correct Answer by Jerry Ye about 7 years 10 months ago

Hi Zeeshan,


If this is the command sequence, then "A" is the correct answer


vlan 22

name Hannahs-vlan

exit


An VLAN can be created in the VLAN database without any port been assigned to that VLAN, however, interface vlan 22 will not be in the up/up state if there isn't any port assigned to VLAN22, or there isn't a trunk link.


HTH,

jerry

Correct Answer by Edison Ortiz about 7 years 10 months ago

The answer is a)


You've successfully created Vlan22 in the Vlan Database.


You are confused with the L3 representation of Vlan 22. It needs to have one port active (access or trunk) to be up/up.


HTH,


__


Edison

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Correct Answer
Edison Ortiz Wed, 07/08/2009 - 10:51
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The answer is a)


You've successfully created Vlan22 in the Vlan Database.


You are confused with the L3 representation of Vlan 22. It needs to have one port active (access or trunk) to be up/up.


HTH,


__


Edison

Correct Answer
Jerry Ye Wed, 07/08/2009 - 10:51
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  • Cisco Employee,

Hi Zeeshan,


If this is the command sequence, then "A" is the correct answer


vlan 22

name Hannahs-vlan

exit


An VLAN can be created in the VLAN database without any port been assigned to that VLAN, however, interface vlan 22 will not be in the up/up state if there isn't any port assigned to VLAN22, or there isn't a trunk link.


HTH,

jerry

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