Trunking Questions

Please explain how to get the dump? I have 69 days to recertifiy

Answer: A

Explanation

SW3 does not have VLAN 60 so it should not receive traffic for this VLAN (sent from SW2). Therefore we should configure VTP Pruning on SW3 so that SW2 does not forward VLAN 60 traffic to SW3.

o_O ???????

sw1 or sw 3 ?

I mean I know that it is needed to be configured on the vtp server switch.

I have already passed CCNP but aperently I should have passed all of them in 3 years all of them , but i didnt know that. so have to do it again.

Same problem mate. I need to do ENCOR despite the fact that i passed 3 CCNP exams :-)

Hi guys, same thing happen to me, I passed the 3 CCNP exams but never thought that it should have to complete within 3 yrs. So now I have to take this ENCOR to get the full Cert.

For the Trunking Questions, please correct me if I’m wrong regarding the command to remove the vlan. I beleive that the command should use the no form of the command and not remove, correct me if I’m wrong.

Question 2

Refer to the exhibit. SwitchC connects HR and Sales to the Core switch. However, business needs require that no traffic from the Finance VLAN traverse this switch. Which command meets this requirement?

D. SwitchC(config)#interface port-channel 1
SwitchC(config-if)#switchport trunk allowed vlan remove 110

D. SwitchC(config)#interface port-channel 1
SwitchC(config-if)#no switchport trunk allowed vlan 110

AS per Cisco Documentation:

switchport trunk allowed vlan
To configure the allowed VLANs for a virtual Ethernet interface, use the switchport trunk allowed vlan command.

To remove the configuration, use the no form of this command.

switchport trunk allowed vlan {{ add | except | remove } vlan_list | all | none }

no switchport trunk allowed vlan

you cant do the no command, you have to do remove. you can lab it up, you will see if you do the no command it will either remove the “switchport trunk allowed vlan” or it will carrot out.

Can anyone plz tell me where are these questions?

@qwe:
Q1 Answer: A
Explanation: vtp pruning command is only acceptable on VTP server. The question says SW1 is VTP server so vtp pruning command is entered on SW1.

You don’t get the right answer at Q2 here when testing your knowledge using Flash Link.

@BonezUK if you mean you type no switchport trunk allowed vlan 110, you are basically erasing everything. Let me sho you

SW# sho run int fa0/1
switchport trunk allowed vlan 110,120
!
!
SW(config)#int fa0/1
SW(config-if)#no switchport trunk allowed vlan 110

SW# sho run int fa0/1
interface FastEthernet0/1
!

you see? no command will remove everything. When you want to add vlan always use “add” and when you want to remove vlan always use “remove” trust me, I learn it the have way LoL

@GZ
I agree – vtp pruning should only be applied on the vtp server.

Regarding Question 2

Refer to the exhibit. SwitchC connects HR ….

I think the Exhibit is missing.

Thank you in advance for updating the question.

Please share the orginal question

Q2
If you choose answer C, you will exclude Vlan 1 and 110.
The given port-channel config is allowing all active Vlans.

Q1:
Enabling VTP pruning on a VTP server enables pruning for the entire management domain

as far as i remember, vlan 1 is always allowed

@admin

Why Q3 answer is D but in the quiz it comes out the correct B ??

@Sirus: We checked but found no problem. The questions in the quiz are shuffled each time so please check again.

The exhibit for question#2 is not visible – referring to Finance VLAN traverse
@digitaktut

@ENCOR: The exhibit in Q2 is the output only, no topology.

The correct answer for Question 2 is

C. SwitchC(config)#interface port-channel 1
SwitchC(config-if)#switchport trunk allowed vlan add 210,310

If you see the ouput of the command you can see that VLAN 1 is used in Po1, but not other Vlan is attached to Po1. That said, you can’t remove what is not there.

So the correct answer is to add the VLAN 210 and 310.

This will be 4th time I am recertificating CCNP. Used to Pass CCNP t shoot – was so easy to recertify. This ENCOR looks like a mess. Still have 8 month to prepare though.

Anonymous – why don’t u go for a CCIE instead!

For Q1 explanation – Therefore we should configure VTP Pruning on SW3 (did you mean SW1 since VTP pruning should be only configured on a server?) so that SW2 does not forward VLAN 60 traffic to SW3

Question 1

Refer to exhibit. VLANs 50 and 60 exist on the trunk links between all switches. All access ports on SW3 are configured for VLAN 50 and SW1 is the VTP server. Which command ensures that SW3 receives frames only from VLAN 50?

If we prune VLAN60 on SW1, would that not prevent VLAN60 being propagated to SW2?

I think that the correct answer should be C, please correct me if I’m wrong.

No, it wouldn’t. We configure pruning on the VTP server only.

VTP pruning should only be run on the VTP server (SW1) right? the answer says VTP pruning is run on SW3, which is not the server…. Please clarify.

@SAS
correct. VTP pruning should only be enabled on VTP servers, all the clients in the VTP domain will automatically enable VTP pruning.

Explanation
========
VTP pruning is disabled by default in Cisco switches. VTP pruning on Cisco helps to send broadcasts only to those trunk links that actually needs the information i.e. with VTP pruning enabled, when the destination MAC address is unknown, frames are forwarded over a trunk link only if the switch on the receiving end of the trunk link has ports in the source VLAN pruning.

It should only be enabled on VTP servers, all the clients in the VTP domain will automatically enable VTP pruning. VLAN 1 can’t be pruned because it’s an administrative VLAN.

@digitaltut … Questions are not visible in the trunking section . Please check

@tranquilo: We checked but found no problem. Could you please check again and please make sure your account is still active.