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Exam 200-301 topic 1 question 186 discussion

Actual exam question from Cisco's 200-301
Question #: 186
Topic #: 1
[All 200-301 Questions]


Refer to the exhibit. After the switch configuration, the ping test fails between PC A and PC B. Based on the output for switch 1, which error must be corrected?

  • A. The PCs are in the incorrect VLAN.
  • B. All VLANs are not enabled on the trunk.
  • C. Access mode is configured on the switch ports.
  • D. There is a native VLAN mismatch.
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️

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Kane4555
Highly Voted 2 years, 10 months ago
Selected Answer: D
Don't overthink it, this is the CCNA, the CCNA says that native VLAN mismatches are bad, and there's a native VLAN mismatch. D.
upvoted 16 times
dipanjana1990
2 years, 3 months ago
can't anybody see that Native Vlan Tagging is enabled on both the switches, so native vlan traffic will go tagged on the trunk port. But allowed vlans on the trunk port is 50-100 whereas the both PC-A and PC-B belongs to vlan A so their traffic won't be allowed on the trunk port. So the correct answer should be B.
upvoted 4 times
freezeladmsflmaldfs
1 year, 4 months ago
Hi, wanted to input that this makes absolutely no sense at all.
upvoted 3 times
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[Removed]
Most Recent 7 months, 3 weeks ago
Selected Answer: D
it´s D
upvoted 2 times
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FALARASTA
1 year, 6 months ago
Selected Answer: D
There is VLAN Mismatch. Remember there is no any intervlan routing on the two sitches thus minimising the chance of communication. Answer is D https://www.youtube.com/watch?v=klqpX6U-_JY
upvoted 2 times
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elixirwell
1 year, 7 months ago
Selected Answer: D
ChatGPT says, Based on the output for switch 1, the error that must be corrected in order for the ping test to be successful between PC A and PC B is option D, "There is a native VLAN mismatch." Explanation: The output of the show interfaces trunk command on Switch 1 shows that the trunk link between Switch 1 and Switch 2 is configured with a native VLAN of 10 on Switch 1 and a native VLAN of 20 on Switch 2. This is a native VLAN mismatch, which can cause issues with VLAN traffic crossing the trunk link. In this scenario, PC A is in VLAN 10 and PC B is in VLAN 20. When the switch receives traffic from PC A, it tags the traffic with VLAN 10, but when the traffic crosses the trunk link to Switch 2, the traffic is sent on the native VLAN 20, which Switch 2 is expecting to receive traffic on. As a result, the traffic from PC A is dropped and the ping test fails. To correct this error, the native VLAN on the trunk link between Switch 1 and Switch 2 should be the same on both switches. Either the native VLAN should be changed to 10 on both switches or it should be changed to 20 on both switches.
upvoted 1 times
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dipanjana1990
2 years, 3 months ago
can't anybody see that Native Vlan Tagging is enabled on both the switches, so native vlan traffic will go tagged on the trunk port. But allowed vlans on the trunk port is 50-100 whereas the both PC-A and PC-B belongs to vlan A so their traffic won't be allowed on the trunk port. So the correct answer should be B.
upvoted 1 times
DixieNormus
2 years, 2 months ago
can't anybody see that Native Vlan Tagging is enabled on both the switches, so native vlan traffic will go tagged on the trunk port. But allowed vlans on the trunk port is 50-100 whereas the both PC-A and PC-B belongs to vlan 99 so their traffic will be allowed on the trunk port. So the correct answer should be D.
upvoted 9 times
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Mauro_Babarram
2 years, 4 months ago
D IS CORRECT
upvoted 2 times
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ZUMY
2 years, 5 months ago
D is correct
upvoted 3 times
dipanjana1990
2 years, 3 months ago
can't anybody see that Native Vlan Tagging is enabled on both the switches, so native vlan traffic will go tagged on the trunk port. But allowed vlans on the trunk port is 50-100 whereas the both PC-A and PC-B belongs to vlan A so their traffic won't be allowed on the trunk port. So the correct answer should be B.
upvoted 1 times
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rictorres333
2 years, 6 months ago
The real problem is that: Sw2 has Vlan 99 as native vlan, this way send untagged traffic. If we put another vlan as native, there is not problem for pinging...
upvoted 1 times
dipanjana1990
2 years, 3 months ago
can't anybody see that Native Vlan Tagging is enabled on both the switches, so native vlan traffic will go tagged on the trunk port. But allowed vlans on the trunk port is 50-100 whereas the both PC-A and PC-B belongs to vlan A so their traffic won't be allowed on the trunk port. So the correct answer should be B.
upvoted 1 times
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Nalle72
2 years, 7 months ago
Packet from PC A to PC B will reach its destination but return packet will not be encapsulated (native vlan 99) in Switch 2, and will be interpreted as vlan 1 in switch 1, thus it will not be forwarded to PC A.
upvoted 3 times
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PoBratsky
2 years, 11 months ago
Correct answer is A. In this case, ping will only fail if the PC is on native VLAN. But in VLAN 99, the ping will be successful. Tested on Cisco Packet Tracer.
upvoted 1 times
dipanjana1990
2 years, 3 months ago
can't anybody see that Native Vlan Tagging is enabled on both the switches, so native vlan traffic will go tagged on the trunk port. But allowed vlans on the trunk port is 50-100 whereas the both PC-A and PC-B belongs to vlan A so their traffic won't be allowed on the trunk port. So the correct answer should be B.
upvoted 2 times
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PoBratsky
2 years, 11 months ago
I'm so sorry. Answer is D. Because PC B in native VLAN. So ping will be failure.
upvoted 1 times
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dave1992
2 years, 11 months ago
i think the answer is A because you would configure the link between a pc and switch as an access port, and links between switches as trunks. the only thing im thinking is if the VLANs are different, then the switch will not forward the frame to the correct vlan.
upvoted 2 times
onikafei
2 years, 9 months ago
Vlans in the chart are different from the code below. And it shows the vlans are mismatched so answer would be D
upvoted 1 times
dipanjana1990
2 years, 3 months ago
can't anybody see that Native Vlan Tagging is enabled on both the switches, so native vlan traffic will go tagged on the trunk port. But allowed vlans on the trunk port is 50-100 whereas the both PC-A and PC-B belongs to vlan A so their traffic won't be allowed on the trunk port. So the correct answer should be B.
upvoted 1 times
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Micah7
3 years, 5 months ago
Native vlan traffic will still go through from one switch to another despite Native Vlan mismatch. It will just create a larger broadcast domain between the 2 switches. However, in this question for the "tagged" vlan traffic there is a disruption- the 2 PCs will not be able to communicate.
upvoted 2 times
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oooMooo
3 years, 6 months ago
When an untagged frame enters a switch port, the native VLAN is tagged on the frame. So if Switch 1 were to send a frame to Switch 2, it would be sent untagged, and Switch 2 would tag it as VLAN 99. If Switch 2 were to send the frame, Switch 1 would tag it as VLAN 1.
upvoted 4 times
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sim5710
3 years, 7 months ago
how is there a native vlan mismatch ?
upvoted 3 times
NerdyNerdy
3 years, 7 months ago
Trunking native vlan on Sw1 is 1, while native vlan on Sw2 is 99
upvoted 7 times
dipanjana1990
2 years, 3 months ago
can't anybody see that Native Vlan Tagging is enabled on both the switches, so native vlan traffic will go tagged on the trunk port. But allowed vlans on the trunk port is 50-100 whereas the both PC-A and PC-B belongs to vlan A so their traffic won't be allowed on the trunk port. So the correct answer should be B.
upvoted 1 times
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SUKABLED
3 years, 9 months ago
True, cause native vlans should also match in order for untagged traffic to get automatically tagged with it, If there are different native VLANs, then packet mismatch will happen, thus no ping
upvoted 2 times
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amrith501
3 years, 10 months ago
any Explanation to this ?
upvoted 2 times
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C (25%)
B (20%)
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