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Exam 300-420 topic 1 question 340 discussion

Actual exam question from Cisco's 300-420
Question #: 340
Topic #: 1
[All 300-420 Questions]





Refer to the exhibits. An engineer is troubleshooting an issue in which the Gig0/2 interface on a Cisco switch named SW2 fails to become the root port. Which two commands must be run on SW2 to resolve this issue? (Choose two.)

  • A. SW2(config-if)# no spanning-tree cost 4
  • B. SW2(config)# interface Gig0/2
  • C. SW2(config-if)# spanning-tree cost 4
  • D. SW2(config)# interface Fa0/3
  • E. SW2(config-if)# spanning-tree cost 5
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Suggested Answer: BE 🗳️

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tossaway25
2 days, 17 hours ago
Selected Answer: AD
Removing the (presumably) misconfigured spanning-tree cost 4 command is the more elegant solution. Manually configuring Fa0/3 with cost of 5 will also achieve the desired result of having Gi0/2 interface becoming the root; but is a poorer design choice.
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ivokol
2 weeks, 4 days ago
Selected Answer: AD
I would remove "spanning-tree cost 4" from fast ethernet. This will cause Fa0/3 to have the default higher cost of 19 and so Gi0/2 will be the preferred one.
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