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Exam 350-401 topic 1 question 138 discussion

Actual exam question from Cisco's 350-401
Question #: 138
Topic #: 1
[All 350-401 Questions]

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?

  • A. SwitchC(config)#vtp pruning vlan 110
  • B. SwitchC(config)#vtp pruning
  • C. SwitchC(config)#interface port-channel 1 SwitchC(config-if)#switchport trunk allowed vlan add 210,310
  • D. SwitchC(config)#interface port-channel 1 SwitchC(config-if)#switchport trunk allowed vlan remove 110
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️

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last7
Highly Voted 4 years, 2 months ago
Answer is D. B would prune vlan 110 because there are no ports in that vlan, except that vtp mode is transparent, so pruning mode is Disabled.
upvoted 17 times
OhBee
2 years, 11 months ago
Also, B is not correct since this switch is not even participating in the VTP domain :)
upvoted 2 times
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ABC123
Highly Voted 3 years, 5 months ago
Option C would be correct also if the keyword "add" was not there
upvoted 10 times
danman32
1 year, 5 months ago
Actually no, because then you'd be eliminating default VLAN 1, which is not what the question wants.
upvoted 1 times
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[Removed]
1 year, 5 months ago
so... its wrong then
upvoted 3 times
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[Removed]
Most Recent 6 months, 2 weeks ago
Selected Answer: D
D is correct
upvoted 1 times
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steficris89898
1 year ago
D is correct!
upvoted 1 times
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djedeen
1 year, 3 months ago
Selected Answer: D
Trunk already allows all VLANs, hence adding 2 VLANs changes nothing (e.g. option C).
upvoted 2 times
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PureInertiaCopy
1 year, 3 months ago
But.... Po1 is in VLAN 1...It's not even a trunk...
upvoted 1 times
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FD_M
1 year, 3 months ago
Selected Answer: D
we cannot enable vtp pruning on this switch b/c this switch is in transparent mode
upvoted 5 times
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khaganiabbasov
1 year, 3 months ago
D is correct You can use vtp pruning command in server mode - switch in transparent mode.
upvoted 2 times
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LanreDipeolu
1 year, 4 months ago
Selected Answer: D
pruning statement can only come from server domain, so the only option is to remove the unwanted vlan with switchport trunk allowed vlan remove 110 statement. "D" is correct
upvoted 2 times
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nushadu
1 year, 11 months ago
Selected Answer: D
before removing vlan10: sw1#show int tru Port Mode Encapsulation Status Native vlan Et0/0 on 802.1q trunking 1 Et0/3 desirable n-isl trunking 1 Po2 on 802.1q trunking 1 Port Vlans allowed on trunk Et0/0 1-4094 Et0/3 1-4094 Po2 1-4094 <<<<<<<<<<<<<<<<<<<< Port Vlans allowed and active in management domain Et0/0 1,10,30,40,50,110 Et0/3 1,10,30,40,50,110 Po2 1,10,30,40,50,110 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Port Vlans in spanning tree forwarding state and not pruned Et0/0 1,10,30,40,50,110 Et0/3 1 Po2 1,30,50 sw1#
upvoted 2 times
nushadu
1 year, 11 months ago
sw1(config-if)#switchport trunk allowed vlan remove 110 sw1(config-if)# sw1(config-if)#do s runn int po2 Building configuration... Current configuration : 182 bytes ! interface Port-channel2 switchport switchport trunk encapsulation dot1q switchport trunk allowed vlan 1-109,111-4094 switchport mode trunk spanning-tree port-priority 64 end sw1(config-if)#
upvoted 2 times
nushadu
1 year, 11 months ago
sw1(config-if)#do s int tr Port Mode Encapsulation Status Native vlan Et0/0 on 802.1q trunking 1 Et0/3 desirable n-isl trunking 1 Po2 on 802.1q trunking 1 Port Vlans allowed on trunk Et0/0 1-4094 Et0/3 1-4094 Po2 1-109,111-4094 <<<<<<<<<<<<<<<<<< Port Vlans allowed and active in management domain Et0/0 1,10,30,40,50,110 Et0/3 1,10,30,40,50,110 Po2 1,10,30,40,50 <<<<<<<<<<<<<<<<<<<<<<<< Port Vlans in spanning tree forwarding state and not pruned Et0/0 1,10,30,40,50,110 Et0/3 1 Po2 1,30,50 sw1(config-if)#
upvoted 1 times
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forccnp
1 year, 12 months ago
Selected Answer: D
D is correct answer 100%
upvoted 2 times
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bora4motion
2 years ago
Selected Answer: D
going with D
upvoted 2 times
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forccnp
2 years ago
Selected Answer: D
D) is correct answer
upvoted 2 times
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prietito
2 years, 6 months ago
Selected Answer: C
ABC123 is correct. By omitting finance vlan allow to trunk. This traffic will not traverse the switch
upvoted 1 times
redgi0
2 years, 4 months ago
Incorrect. You have a trunk allowing ALL VLAN. if you ADD 2 VLANs, you will still have a trunk allowing ALL VLAN D is correct answer
upvoted 6 times
danman32
1 year, 5 months ago
And if there wasn't an ADD clause, you'd then be blocking VLAN 1 which is clearly not desired.
upvoted 1 times
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Eddgar0
2 years, 7 months ago
Selected Answer: D
D is correct, as switch is transparent mode that means vtp prunning can not be enable also not participating on the VTP. the option C is adding vlan but in the image all vlans are already allowed in the trunk, The only option is D as is blocking the undesired vlan from the trunk.
upvoted 4 times
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Nhan
3 years, 2 months ago
Basically the vlan 110 need to be block from the trunk port which is po1 in this case
upvoted 3 times
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AliMo123
3 years, 7 months ago
Also, prune mode is configured only on VTP server mode , so option D is 100% correct
upvoted 3 times
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A (35%)
C (25%)
B (20%)
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